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2019-12-16 GC Agenda - Item 5 - Attachment 1 - Noosa Spit Shoreline Erosion Management Plan-Part 2
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References
6 References
Barnes, M.P., Visser, J. and Fisk, G. (2017). Implementation of Trigger-Based Coastal Management
Strategies, Coasts & Ports 2017 Conference.
Collins (1972). Prediction of shallow-water spectra, Journal of Geophysical Research, Volume 7,
Issue 15, Oceans and Atmosphere, 2693 – 2707.
Geoscience Australia (2017). High-resolution depth model for the Great Barrier Reef, Beaman R.J.
Fisk, G. & Kay, R. (2010). Dealing with uncertainty in climate change adaptation planning and
developing triggers for future action, Practical Responses to Climate Change Conference 2010,
Melbourne, September 2010.
Commonwealth Government (2015). EPBC Act Policy Statement 3.21 – Industry guidelines for
avoiding, assessing and mitigating impacts on EPBC Act listed migratory shorebird species.
Commonwealth Department of the Environment, Canberra, Australia.
ICM (2010a). Option Review Noosa River Spit, prepared for Sunshine Coast Regional Council.
ICM (2010b). Noosa River Spit Erosion Protection Works Drawing Register, 23 November 2010,
prepared for Sunshine Coast Regional Council.
MSQ (2019). Queensland Tide Tables 2017. Maritime Safety Queensland.
O’Brien, M. P. (1969) Equilibrium Flow Areas in Inlets on Sandy Coasts. Journal of the Waterways
and Harbours Division. ASCE No. WW1, pp.43-52.
Queensland Government (2012). Queensland coastal risk and bathymetric LiDAR: a pilot study for
collecting near-shore bathymetry. Queensland Department of Science, Information Technology,
Innovation and the Arts, Brisbane, Australia.
Saha, S., and Coauthors (2010). The NCEP Climate Forecast System Reanalysis. Bull. Amer.
Meteor. Soc., 91, 1015-1057.
Saha, S., and Coauthors (2014). The NCEP Climate Forecast System Version 2. J. of Climate, 27(6),
2185-2208.
Tomlinson and Chamberlain (2006). Noosa River Entrance Channel Dynamics, Griffith University,
CRC for Coastal Zone, Estuary and Waterway Management, 1 – 75.
van Rijn, L.C., D.J.R. Walstra and M. van Ormondt (2004). Description of TRANSPOR2004 and
Implementation in Delft3D-ONLINE. Z3748.10 – report prepared by Delft Hydraulics for DG
Rijkswaterstaat.
WMA Water (2017). Noosa River Flood Study Upgrade, prepared for Noosa Shire Council, March
2017.
WRL (2014). Riverbank Vulnerability Assessment using a Decision Support System: Clarence River
(Rogans Bridge to Ulmarra), WRL Technical Report 2014/12 December 2014.
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\R.B23636.001.02.SEMP_final.docx
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Section 2
Noosa Spit SEMP Final Report A-1 Metocean Data Collection Appendix A Metocean Data Collection G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\R.B23636.001.02.SEMP_final.docx
Section 3
BMT Eastern Australia Pty Ltd
Level 8, 200 Creek Street
Brisbane Qld 4000
Australia
PO Box 203, Spring Hill 4004
Tel: +61 7 3831 6744
Fax: + 61 7 3832 3627
ABN 54 010 830 421
www.bmt.org
Technical Memorandum
Noosa Shire Council
From: Matthew Barnes To: Daniel Wishaw
Date: 29 March 2019 CC:
Subject: Noosa Spit SEMP - Lower Noosa River Metocean Data Collection
1 Instrument Deployment Summary
To inform the Noosa Spit SEMP, metocean data collection has commenced including:
• The deployment of six tide recorders in the lower Noosa River to continuously measure water level for
approximately six weeks. This data will be used to calibrate the hydrodynamic model and may also
provide some valuable information to partially address concerns regarding the published tidal planes.
• Offshore fixed deployment Acoustic Doppler Current Profiler (ADCP) to continuously measure water
level, current speed, current direction and wave parameters (height, period and direction). This data will
be used to calibrate both the hydrodynamic and wave models.
• Boat-mounted ADCP measurements have been collected during both neap and spring tidal conditions.
The measurements (from approximately low water to low water) were taken at Dog Beach, Noosa
Sound, Munna Point and Noosaville. This data will used to calibrate the hydrodynamic model and
understand the peak flood and ebb tide currents occurring at Dog Beach.
Figure 1-1 provides a map showing the instrument deployment and boat-mounted ADCP cross-sectional
transect locations. Table 1-1 provides a summary of the instruments. It is anticipated that the deployed
instruments will be retrieved in late April 2019.
Section 2 provides further details on the boat-mounted ADCP measurements
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 4
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3
Table 1-1 Instrument Details
Instrument Measurement Deployment Location & Date
Teledyne RDI WorkHorse Sentinel Acoustic Doppler Current • Current magnitude and Noosa Main Beach, approximately 8 m water
Profiler (ADCP) direction (0.5 m bins) depth (refer Figure 1-1):
Sea Spider Frame • Deployment: 10 March 2019
• Wave parameters (height,
period, direction) • Retrieval (indicative): 29 April 2019
• Water level
In-Situ TROLL 500 Pressure Transducer • Water level Lower Noosa River, 6 locations (refer Figure
1-1)
In-Situ Rugged Baro TROLL • Atmospheric pressure (used Lower Noosa River, 2 locations (refer Figure
to correct the water level 1-1):
measurement) • Deployment: 13 March 2019
• Retrieval (indicative): 29 April 2019
Boat-mounted RDI WorkHorse Sentinel Acoustic Doppler • Quasi-instantaneous Lower Noosa River, various locations (refer
Current Profiler (ADCP) sectional flow (transect) Figure 1-1):
• Neap tide transects: 14 March 2019
• Quasi-instantaneous
sectional current magnitude • Spring tide transects: 20 & 21 March 2019
and current direction (0.25 m
bins)
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 6
4
2 Boat-mounted ADCP Transect Summary
Acoustic Doppler Current Profilers (ADCPs) measure 3D velocities in a vertical profile of discrete bins at
an instant in time (called an ensemble). A boat-mounted ADCP is used to measure velocity profiles while
the boat traverses a section or transect. Total flow through the transect is calculated by integrating the
ADCP velocity profile data vertically from the bottom-most to the top-most bin and horizontally/temporally
across each transect using the Teledyne RD Instrument WinRiver II software.
A total of 288 unique transects were completed during neap tide and spring tide periods in the lower Noosa
River. The transect locations are shown in Figure 2-1 and include:
• Neap tide cross-sectional transects at Dog Beach, Noosa Sound, Munna Point and Noosaville on 14
March 2019
• Spring tide cross-sectional transects at Dog Beach, Noosa Sound, Munna Point and Noosaville on 20
March 2019
• Spring tide long-sectional transects at Dog Beach on 21 March 2019
Figure 2-1 ADCP Transect Locations
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 7
5 Example processing of a flood tide and ebb tide cross-sectional transect at Noosaville is shown in Figure 2-2 and Figure 2-3. The right panel of the WinRiver II interface provides a summary of the measurement including: • Total Q (flow, m3/s) which is the sum of the ‘Measured Q’, ‘Top Q’ and Bottom Q. The ‘Top Q’ and ‘Bottom Q’ are estimates of the flow components not directly measured by the ADCP due to instrument blind spots at the top and bottom of the water column. Similarly, the WinRiver II software estimates the ‘Left Q’ and ‘Right Q’ which correspond to the flow components at the left and right riverbanks that cannot be directly measured with the boat-mounted instrument. • The width (m) of the transect and the cross-sectional area (m2) and estimates of the cross-sectional flow speed (m/s) The ‘Stick Ship Track’ illustrates the transect and the magnitude and direction of the flow. The ‘sticks’ pointing upstream in Figure 2-2 indicate flood tide conditions. The ‘sticks’ pointing downstream in Figure 2-3 indicate ebb tide conditions. The cross-sectional plot at the bottom of the WinRiver II interface shows the vertical bins at an instant in time (the instantaneous ensemble) as the boat-mounted instrument is towed across from the right to left riverbank (or vice versa). Together, the combined bins provide a quasi-instantaneous snapshot of the cross- sectional flow velocity. This data is the basis for calculating the ‘Measured Q’. Timeseries plots of the quasi-instantaneous ‘Measured Q’ at Dog Beach, Noosa Sound, Munna Point and Noosaville are provided in Figure 2-4 and Figure 2-5. For reference, the indicative water level at Munna Point is also shown on the plots (based on Maritime Safety Queensland predations and published tidal planes). In tidal estuaries and at a given location, the peak flood or ebb flow rates will coincide with the transition from high to low water (or vice versa). The flow rate will be close to zero at times of peak high or low water level (commonly referred to as ‘slack water’). The cross-sectional ‘Measured Q’ and ‘Total Q’ collected with the boat-mounted ADCP will provide important data for calibrating the hydrodynamic model developed for the SEMP. The data will be used to validate the volume of water in the estuary between high and low tide. The measured cross- and long-sectional flow velocity and direction will also be used for model calibration/validation purposes. The long-sections will also provide important information on the peak spring tide currents at Dog Beach. G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 8
6
Figure 2-2 Example Flood Tide ADCP Transect Measurement at the Upstream (Noosaville) Location
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 9
7
Figure 2-3 Example Ebb Tide ADCP Transect Measurement at the Upstream (Noosaville) Location
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 10
8
Figure 2-4 Measured Q at Dog Beach (top) and Noosa Sound (bottom)
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 11
9
Figure 2-5 Measured Q at Munna Point (top) and Noosaville (bottom)
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.002.MetoceanDeployment.docx
Section 12
BMT Eastern Australia Pty Ltd
Level 8, 200 Creek Street
Brisbane Qld 4000
Australia
PO Box 203, Spring Hill 4004
Tel: +61 7 3831 6744
Fax: + 61 7 3832 3627
ABN 54 010 830 421
www.bmt.org
Technical Memorandum
Noosa Shire Council
From: Matthew Barnes To: Daniel Wishaw
Date: 31 May 2019 CC:
Subject: Noosa Spit SEMP - Lower Noosa River Metocean Data Collection
1 Instrument Retrieval Summary
To inform the Noosa Spit SEMP, metocean data collection has been completed. Fixed deployment
instruments were retrieved between 28-30 April 2019. This memorandum follows the previous
correspondence (M.B23636.002.MetoceanDeployment, 29 March 2019) and includes a summary of the
following datasets:
• Tide recorder (pressure transducer) continuous measurements of water level for approximately six
weeks at six locations in the lower Noosa River. This data will be used to calibrate the hydrodynamic
model and may also provide some valuable information to partially address concerns regarding the
published tidal planes.
• Fixed deployment Acoustic Doppler Current Profiler (ADCP) continuous measurements of water level,
current speed, current direction and wave parameters (height, period and direction) offshore from Noosa
Main Beach. This data will be used to calibrate both the hydrodynamic and wave models.
Figure 1-1 provides a map showing the instrument deployment locations.
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 13
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5 1 1 1 76 2 1140 1935 61 41 96 Title:
5 1 1 1 76 3 2842 1934 85 41 96 Figure:
5 1 1 1 76 4 3295 1946 46 19 96 Rev:
4 1 1 1 77 0 278 2012 3075 40 -1
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5 1 1 1 83 8 2238 2216 53 69 39 SS
5 1 1 1 83 9 2940 2242 69 29 56 ‘ay
5 1 1 1 83 10 3104 2221 211 60 94 BMT
4 1 1 1 84 0 2328 2267 690 31 -1
5 1 1 1 84 1 2328 2267 111 31 96 Approx.
5 1 1 1 84 2 2451 2267 79 25 96 Scale
5 1 1 1 84 3 2967 2269 51 16 0 —-
4 1 1 1 85 0 3038 2301 138 22 -1
5 1 1 1 85 1 3038 2301 138 22 91 www.bmt.org
4 1 1 1 86 0 1153 2358 979 28 -1
5 1 1 1 86 1 1153 2358 90 24 41 Filepath:
5 1 1 1 86 2 1297 2362 835 24 16 —_|:\B23636.i.mpb.NoosaSpit_SEMP\DRG\COA_005_Equipment_locations.worSection 14
3
2 Fixed Deployment Measurements
2.1 Frames of Reference
Units are expressed using the SI (Système International d'unités) convention unless otherwise stated.
Wind and wave direction are expressed as ‘FROM’ the direction of approach and in nautical degrees
(degrees relative to true north, positive clockwise).
Current direction is expressed as ‘TO’ the direction of flow and in nautical degrees (degrees relative to true
north, positive clockwise).
2.2 Deployment Period Characteristics
2.2.1 Regional Wind
Double Island Point Lighthouse weather station (040068, operated by the Bureau of Meteorology) wind
roses for the deployment period (10/03/2019 to 30/04/2019) and the long-term average (01/01/1996 to
30/04/2019) are compared in Figure 2-1. The deployment period regional wind characteristics include:
• A predominance of S to SE trade winds;
• A directional spread of winds that is relatively consistent with the long-term average, noting a slightly
higher proportion of NNE and SSE winds;
• A lower proportion of 10-minute wind speed exceeding 20 m/s (approximately 39 knots) compared to
the long-term average; and
• A higher proportion of 10-minute wind speeds between 10 and 15 m/s (approximately 20 to 30 knots)
compared to the long-term average.
Figure 2-1 Double Island Point wind magnitude and direction rose plots: deployment
period (left) and long-term average (right)
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 15
4
2.2.2 Regional Waves
Mooloolaba Wave Buoy (operated by the Queensland Department of Environment and Science) wave
roses for the deployment period (10/03/2019 to 30/04/2019) and long-term average (01/01/2007 to
30/04/2019) are compared in Figure 2-2. The deployment period regional wave characteristics include:
• A predominance of E to ESE wave conditions;
• A higher proportion of easterly wave conditions compared to the long-term average; and
• A slightly higher proportion of wave heights exceeding 2 m compared to the long-term average.
Figure 2-2 Mooloolaba wave buoy significant wave height and direction rose plots:
deployment period (left) and long-term average (right)
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 16
5 2.3 Offshore ADCP, Noosa Main Beach Figure 1-1 shows the Noosa Main Beach Offshore ADCP deployment location. The instrument was bottom- mounted at a depth of approximately 9.5 m below AHD. 2.3.1 Currents Recorded current magnitude and direction offshore from Noosa Main Beach and within Laguna Bay are presented as time series and polar plots over the following vertical segments: • Depth-averaged over the entire water column (Figure 2-3 and Figure 2-4) • Bottom third of the water column (Figure 2-5 and Figure 2-6) • Middle third of the water column (Figure 2-7 and Figure 2-8) • Top third of the water column (Figure 2-9 and Figure 2-10) The deployment period current characteristics include: • The depth-averaged currents were typically less than 0.2 m/s except for the final week of deployment which coincided with increased winds. The currents align NE to SW with the ebb and flood phases of the tide and show a weak residual to the SW. The prevailing wave energy is likely to enhance the net SW current direction at this location (refer Section 2.3.2). • The bottom third of the water column currents were typically less than 0.15 m/s and not strongly influenced by winds. The currents align NE to SW with a very weak residual to the SW. • The middle third of the water column currents were higher in magnitude and show a stronger residual toward the SW compared to the bottom currents. • The highest magnitude currents occur in top third of the water column where they are influenced by wind shear at the water surface. The current direction at the surface is more variable due to the wind. G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 17
6
Figure 2-3 Depth-averaged (entire water column) current magnitude (top) and direction
(bottom) time series
Figure 2-4 Depth-averaged (entire water column) current magnitude (m/s) and direction
polar scatter plot
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 18
7
Figure 2-5 Bottom third of water column current magnitude (top) and direction (bottom)
time series
Figure 2-6 Bottom third of water column current magnitude (m/s) and direction polar
scatter plot
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 19
8
Figure 2-7 Middle third of water column current magnitude (top) and direction (bottom)
time series
Figure 2-8 Middle third of water column current magnitude (m/s) and direction polar
scatter plot
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 20
9
Figure 2-9 Top third of water column current magnitude (top) and direction (bottom)
time series
Figure 2-10 Top third of water column current magnitude (m/s) and direction polar
scatter plot
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 21
10 2.3.2 Waves Recorded significant wave height (Hs or Hsig), wave peak period (Tp) and wave direction time series are shown in Figure 2-11. The distribution of significant wave height and direction is also illustrated in Figure 2-12. The Laguna Bay wave climate for the deployment period had the following characteristics: • Significant wave height typically less than 1.5 m except for the final week of deployment which coincided with increased winds and increased significant wave height close to 2.0 m. • Wave peak period was typically between 7 and 9 s. • Due to wave refraction processes at Noosa Headland (Noosa National Park) the dominant wave direction was from the NNE to NE sector. The consistent direction of wave approach is likely to contribute to the observed net SW currents shown in Section 2.3.1. G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 22
11
Figure 2-11 Recorded significant wave height (top), peak period (middle) and wave
direction (bottom)
Figure 2-12 Recorded significant wave height and direction rose plot
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 23
12
2.4 Tide Recorders, Noosa Main Beach & Lower Noosa River
The recorded water level offshore from Noosa Main Beach (Laguna Bay) and within the lower Noosa River
time series plots are presented in Figure 2-13 to Figure 2-15. Each plot compares the offshore tidal water
level variation with the attenuated condition within the lower Noosa River.
Table 2-1 provides a summary minimum and maximum water level recorded at each location and shows a
significant reduction in the tidal range between Laguna Bay and inside the river entrance. According to
common tidal range classification, Laguna Bay is mesotidal (tidal range between 2 and 4 m) and the lower
Noosa River is microtidal location (tidal range less than 2 m). It is noted that the published astronomic tidal
range for Munna Point 1.0 m and Tewantin is 0.89 m and the recordings are generally within this range.
It is noted that Tide Recorder 2 (bottom plot in Figure 2-13) appeared to have been moved on retrieval of
the instrument. The raw data suggested that this occurred during the first week of deployment. Data
recorded before this time has been discarded.
Table 2-1 Summary of recorded tidal range
Location Minimum Maximum Range
(m MSL*) (m MSL*) (m)
Noosa Main Beach (Laguna Bay) -1.33 1.53 2.86
Tide Recorder 1 (river mouth) -0.40 0.77 1.17
Tide Recorder 2 (Noosa Sound east) -0.33 0.61 0.94
Tide Recorder 3 (Munna Point) -0.31 0.61 0.92
Tide Recorder 4 (Noosa Yacht Club) -0.29 0.55 0.84
Tide Recorder 5 (Noosa Marina, Tewantin) -0.29 0.56 0.85
Tide Recorder 6 (Tewantin Ferry crossing) -0.27 0.39 0.66
*mean sea level for the instrument deployment period
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Section 24
13
Figure 2-13 Recorded Water Level – Tide Recorder 1 (top) and Tide Recorder 2 (bottom)
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Section 25
14
Figure 2-14 Recorded Water Level – Tide Recorder 3 (top) and Tide Recorder 4 (bottom)
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 26
15
Figure 2-15 Recorded Water Level – Tide Recorder 5 (top) and Tide Recorder 6 (bottom)
G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\M.B23636.003.MetoceanRetrieval.docx
Section 27
Noosa Spit SEMP Final Report B-1 Bathymetric Survey (Acoustic Imagery 2019) Appendix B Bathymetric Survey (Acoustic Imagery 2019) G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\R.B23636.001.02.SEMP_final.docx
Section 28
Noosa River Survey
(Ferry Crossing to Offshore of Entrance)
March 2019
Noosa Council
Assembled by D. Bergersen
26 March 2019
Last Revised: 20 June 2019
Version 1.1
Section 29
EXECUTIVE SUMMARY ............................................................................................................3
1.0 INTRODUCTION .............................................................................................................4
2.0 SYSTEM COMPONENTS ...............................................................................................6
2.1 EDGETECH 6205 MULTIPHASE ECHOSOUNDER .....................................................................6
2.2 APPLANIX POS MV W AVEMASTER .......................................................................................6
2.3 SONTEK CASTAWAY CTD ....................................................................................................7
2.4 QPS ACQUISITION, PROCESSING, AND ANALYSIS SOFTWARE ................................................7
2.5 LAND TRANSECTS AND SINGLE BEAM ECHOSOUNDER ...........................................................8
3.0 GEODETICS AND DATA REDUCTION .........................................................................9
4.0 SYSTEM INSTALLATION AND CALIBRATION ......................................................... 10
4.1 SYSTEM INSTALLATION ..................................................................................................... 10
4.2 SYSTEM COMMUNICATION AND CALIBRATION ..................................................................... 13
5.0 DATA PROCESSING ................................................................................................... 15
6.0 RESULTS ..................................................................................................................... 17
SURVEY OPERATIONS............................................................................................................. 17
COMPARISON TO EXISTING BATHYMETRY AND FUTURE SURVEYS ............................................. 21
BACKSCATTER DATA .............................................................................................................. 22
7.0 SUMMARY ................................................................................................................... 23
2 Noosa Council - Noosa River Survey 20.06.2019
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Executive Summary Two surveys were conducted for the Noosa Council across a section of the Noosa River extending from the Noosa Ferry crossing to offshore of the Noosa River entrance: a multiphase echo sounder (MPES) swath survey and a single beam echo sounder (SBES) / land transect survey. The latter focussed on shorelines and sand banks around the entrance to the river not surveyed by the swath mapping system. Both surveys were completed without any safety incidents and in a timely manner. The MPES produced both bathymetry and backscatter (sidescan sonar) data. The emphasis for this survey was the bathymetry data in support of a shoreline erosion study being conducted by coastal engineering consultants. However, the backscatter data were also logged for possible future use in other Noosa Council projects and a small sample of the processed data is presented in this report. Positioning accuracy (horizontal and vertical) for all survey data were 1-2cm, with all data reduced to AHD. Approximately 2.0 km2 of river area were surveyed with 100% swath coverage, a considerable amount considering the bulk of the river depth is around 2m AHD. The MPES and SBES data were combined and interpolated to produce a composite digital terrain model (DTM) for the entire survey area. A highly detailed view of river and entrance features was obtained, and the swath coverage should assist in the engineering modelling efforts being undertaken by the Noosa Council. The backscatter data, although not a focus of this report, can be used in the future for such objectives as seabed characterisation and detection of small features on the riverbed or along the river banks (e.g., anthropogenic debris, rocks, soft sediment areas, etc.). In turn, the combined data set, when imported into a 3D/4D Scene, should provide the Noosa Council with a useful marketing tool to highlight dynamic nature of the river and the complex topography hidden beneath the main water body. 3 Noosa Council - Noosa River Survey 20.06.2019
Section 31
1.0 Introduction
Acoustic Imaging Pty Ltd (AI) was contracted by the Noosa Council (NC) to carry out a
bathymetry and land survey of the Noosa River extending from the Noosa River Ferry
crossing to 500m offshore of the Noosa River entrance. Both surveys will contribute to a
Shoreline Erosion Management Plan being developed for the Noosa Spit region by coastal
engineering consultants (Figure 1).
The specific survey services requested by NC included:
• A hydrographic survey of the Noosa River and river mouth, and;
• A land-based survey of shoreline positions and sand shoals to overlap the
hydrographic survey points.
Figure 1: Regional overview of Noosa River survey.
Three primary surveys were conducted as part of this project.
• An initial multiphase echo sounder (MPES) survey was conducted using the Marine &
Earth Sciences (MES) vessel SURVEY1 between March 14-20, 2019. Survey
coverage over this period essentially mapped all areas deeper than the 0.5m contour
on the prevailing tide.
• A secondary single beam echo sounder (SBES) survey conducted on April 09, 2019
to augment depth information across the sand shoal region of the Noosa River
Entrance.
• A selective land survey conducted on April 09 and further infill on May 02, 2019 to
capture beach transects, exposed sand shoals in the Entrance region, and foreshore
regions around Dog Beach and along Gympie Terrace.
4 Noosa Council - Noosa River Survey 20.06.2019
Section 32
The swath mapping system consisted of:
• Edgetech 6205 Multiphase Echo Sounder (bathymetry and backscatter);
• Applanix POS MV Wavemaster (positioning, motion, and heading data);
• AML micro-SVS (sound velocity at the sonar head);
• SonTek Castaway CTD (sound velocity through the water column);
• QPS QINSy software (data acquisition and real-time quality control);
• QPS Qimera and Fledermaus (data processing, editing, validation, and presentation);
• Chesapeake Technology SonarWiz (backscatter data processing).
An RTK GNSS antenna and Ceeducer single beam echosounder transducer were used for
the shallow sand bank and beach/foreshore transects.
This report provides an overview of the results from the Noosa River survey and forms a part
of the data deliverables consisting of:
• Ungridded processed data in XYZ Ascii format;
• Digital terrain models (gridded data) in XYZ Ascii format;
• Contours across various survey blocks in the river and offshore;
• Backscatter mosaic of selected representative areas in GeoTiff format;
• Fledermaus Scene containing relevant data sets for further review by NC;
• Daily reports during survey operations to convey progress and any incidents affecting
operations; and
• Summary report discussing survey results.
5 Noosa Council - Noosa River Survey 20.06.2019
Section 33
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2.1 Edgetech 6205 Multiphase Echosounder
The swath mapping sonar used for the survey was an Edgetech 6205 (ET6205) Multiphase
Echo Sounder (MPES). The ET6205 produces real-time, high resolution, three dimensional
maps of the seafloor whilst providing co-registered simultaneous dual frequency side scan
imagery.
For the bathymetry, the ET6205 uses ten receive element transducers and one discrete
transmit element. The high number of channels enables superior rejection of multipath
effects, reverberation and acoustic noise commonly encountered in the shallow water survey
environment. The frequency of the bathymetry channels is 550kHz with an effective “beam”
size of 1º x 1º.
Figure 2: Edgetech 6205 transducer head
The sidescan sonar imagery is spread across 4 channels of information: 2 channels at
230kHz and 2 channels at 550kHz. The lower frequency channels provide more information
on seabed types whereas the higher frequency channels are better for object / feature
detection.
An AML Micro-X Sound Velocity Sensor (SVS) at the head of the sonar provided sound
velocity information required for beam steering on a per ping basis. The Micro-X has
capabilities for measuring sound velocity ranges from 1375 m/s to 1625 m/s at an accuracy of
0.025 m/s.
2.2 Applanix POS MV Wavemaster
The Positioning and Orientation solution for this project was an Applanix POS MV
Wavemaster consisting of a small form factor (SFF) POS Control System (PCS) with IP68
water submersible Titanium sealed IMU and a pair of Trimble antennas.
Figure 3: Applanix POS MV Wavemaster components.
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The POS MV Wavemaster is a user-friendly, turnkey system designed and built to provide
accurate attitude, heading, heave, position, and velocity data. POS MV is proven in all
conditions and is the georeferencing and motion compensation solution of choice for
hydrographic professionals.
A Fugro Marinestar navigation aiding subscription was activated as part of the Noosa River
survey, improving the real-time positioning of the system to less than 10cm horizontally and
vertically. The raw positioning and orientation data were post-processed in the Applanix
POSPac MMS software package to further improve horizontal and vertical accuracy to less
than 5cm.
Roll and Pitch accuracy from the IMU were approximately 0.03°, with Heave accuracy around
5cm. Heading accuracy post-calibration was around 0.1°.
2.3 Sontek Castaway CTD
To correct for refraction through the water column a sound velocity probe must be employed
during any hydrographic survey. The unit used for this survey was a SonTek CastAway CTD.
Designed for coastal profiling, the CastAway-CTD® incorporates a 6-electrode conductivity
cell, coupled with a fast response thermistor to provide highly accurate, high resolution CTD
measurements to depths of 100 m. The sound velocity accuracy derived from the CTD is 0.15
m/s. The unit has an in-built GNSS chip that captures the time and location of the CTD profile,
and BlueTooth capability for transferring data.
Figure 4: Sontek Castaway CTD.
During acquisition a comparison between the currently loaded SVP and the sound velocity
measured at the transducer head was monitored. If differences became too pronounced, then
another CTD cast was implemented. In water depths where relevant, a cast was made at a
minimum of the start, the middle, and the end of each survey day.
2.4 QPS and Chesapeake Acquisition, Processing, and Analysis
Software
The QPS QINSy package was used for data acquisition. The software has an excellent
reputation for robustness and stability and provided a number of useful online quality control
(QC) displays for data monitoring. QINSy logs all raw data in a proprietary DB format, and
geospatially corrected data (XYZ solution) in a QPD format. Options exist for exporting a
variety of non-proprietary formats.
Figure 5: Typical QC displays offered by QINSy.
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Section 35
Further processing of the data was done in the QPS Qimera and Chesapeake SonarWiz
software packages. Qimera was used to correct, clean, and reduce the bathymetry data to the
AUSGEOID09 datum, whereas SonarWiz was used to geospatially correct and image
enhance the sidescan sonar data into mosaics.
Figure 6: Qimera post-processing software.
All data were combined in Fledermaus to better assess the relationship between the
bathymetry and backscatter data, and to QC the results from all survey areas.
2.5 Land Transects and Single Beam Echosounder
Ground elevations over the sandbank and beach profiles were acquired using a Leica GNSS
GG04 Smart Antenna interfaced to a handheld computer operating Zeno Mobile software for
data collection. Real time corrections were received from HxGN Smartnet via a mobile link.
The antenna was mounted at a fixed height on a backpack unit with data acquired every
second whilst walking over the mapping areas.
Ground elevations over the very shallow water areas were captured from a shallow draft
dingy fitted with a 200kHz Ceeducer Ceescope single beam echo sounder (SBES) operating
at 6 pings per second. SBES data were acquired with Chesapeake Technology SonarWiz
software along with positioning and time stamp information 6 times per second. Vertical
accuracy of the single beam transducer at 8 degree beam width is 0.02% of depth or 1cm,
whichever is greater. The Leica GNSS GG04 Smart Antenna was located above the
transducer at a fixed height and provided elevation of the transducer face to reduce the
soundings to datum. Bar checks were undertaken prior to data acquisition and determined a
water velocity of 1518 m/s.
All data were reduced to Australian Height Datum (AHD).
8 Noosa Council - Noosa River Survey 20.06.2019
Section 36
3.0 Geodetics and Data Reduction
For the Noosa River survey real-time positioning was provided via a direct Fugro Marinestar
G4+ tight coupling with the POS MV Primary GNSS antenna and GNSS inertial solution. This
aiding solution was at the ITRF2014 Ellipsoid. Transformation parameters to reduce the data
to GDA94 were registered within the POSView control software, and further reductions to
AUSGEOID09 were implemented in the QINSy logging software. Background to the reduction
process is shown in the bullet points below.
• Satellite positioning systems generate positions to the WGS84 datum. WGS84 is the
World Geodetic System 1984 and is the main reference for all GPS-based
measurement systems.
• Australia uses the GDA94 datum. Differences between WGS84 and GDA94 are
small, but become significant for detailed survey operations, and change in time due
to the movement of the Australian continent relative to the satellite constellation.
• MGA94 is a Universal Transverse Mercator (UTM) projection of GDA94 geographical
coordinates.
• Real Time Kinematic PPP GNSS systems use a geostationary satellite to transmit
corrections to the equipped GNSS antenna positioning unit, allowing much higher
accuracy for positioning, generally to sub 15cm level.
• AUSGeoid09 is a geodetic model maintained online by the Australian Government
Dept. of Resources, Energy and Tourism. This model describes the relationship
between the ellipsoidal height (GDA94) and the orthometric height in AHD.
Following acquisition, the POS MV data were post-processed using the Trimble CentrePoint
RTX service to improve the accuracy of the ellipsoid-referenced height in GDA94. Trimble
RTX leverages real-time satellite and atmospheric data from a global network of tracking
stations, along with highly accurate models and algorithms to generate Trimble RTX
corrections. These corrections were used to provide 1-2 cm accuracy for the georeferencing
of the dataset to AHD.
AHD is the vertical datum requested by NC. Employing the method above ensures that both
high accuracy bathymetry and on-shore NC data are referenced to AHD. Spot checks of AHD
conformance with the new swath data were conducted by comparing contours derived from
the new data to previous charts created across the survey region (selecting those areas least
likely to have experienced any erosional or depositional changes). An example image is
shown in the figure below.
Figure 7: Alignment of chart contours with 2019 swath bathymetry contours.
9 Noosa Council - Noosa River Survey 20.06.2019
Section 37
4.0 System Installation and Calibration
4.1 System Installation
Installation of the swath mapping system on the MES vessel SURVEY 1 occurred on March
14, 2019. The AI Universal Sonar Mount (USM) Expedition mount was attached to the
starboard side of the SURVEY1. A permanent mounting plate is affixed to the gunnel of the
SURVEY1 and the USM hinge mount bolts on to the plate. A vertical Z-Pole is attached to the
hinge mount, and the ET6205 transducer attaches to it.
An antenna mast with GNSS spreader bar attaches to the back side of the hinge mount, and
a plate for the POS MV IMU attaches to the front side. Thus all MPES components are affixed
relative to the mount and not the vessel.
Figure 8: ET6205 mounted on starboard side of SURVEY1.
The Z-Pole pivots around the USM X-Pole and hence be raised out of the water during vessel
transits. Deployment of the transducer into a vertical / survey configuration was done in a very
controlled manner through a combination of purpose-built large wrench attached to the
rotation mechanism on the hinge mount and a rope attached near the base of the pole.
Recovery of the pole into a horizontal position was done in a similar manner.
10 Noosa Council - Noosa River Survey 20.06.2019
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In the deployed state, further support for the transducer and pole was provide by a wood
block inserted between the Z-Pole and the vessel hull, and a ratchet strap extended around
the lower part of the Z-Pole and then tightened to secure all components to the vessel.
Figure 9: Deployment and securing of Edgetech 6205 on pole to vessel.
11 Noosa Council - Noosa River Survey 20.06.2019
Section 39
The two Trimble 540AP GNSS antennas associated with the POS MV were affixed to a pair
bolts at the ends of the spreader bar. The location of the mast / mount provided clear views of
all available GNSS satellites. Separation between the two antennas is mechanically designed
to be 2m but a refined measurement was derived from the GNSS Azimuthal Measurement
System (GAMS) calibration (see Calibration section below)..
Figure 10: GNSS antenna mounting on an L-shaped bracket at the stern of the vessel.
The POS MV PCS and all other electrical equipment were housed in the bow section of the
main cabin. GNSS antenna and IMU cables were fed into the area along the starboard side of
the deck and excess cable neatly coiled within the space to minimise the risk of
trips/slips/damage to the cables.
The acquisition laptop was located on a shelf in front of the passenger seat on the port side of
the vessel. An external monitor was connected to the laptop to provide the helmsman with
display of the real-time DTM to assist in vessel steerage.
12 Noosa Council - Noosa River Survey 20.06.2019
Section 40
4.2 System Communication and Calibration
After the POS MV system was installed and all cables connected, basic system
communication tests were conducted to ensure that all sensors composing the POS MV were
receiving or sending data. This included checking whether the Marinestar navigation aiding
solution was being received.
The figure below shows an example of Marinestar reception in POSView, the online interface
associated with the POS MV. Fields within the User Interface (UI) were monitored for
changing values and reception of the Marinestar signal is shown in the Nav Status field.
Figure 11: POS MV Communication and Integration Tests – Marinestar integration received successful,
IMU, PGNSS and SGNSS received successfully.
Communication between the POS MV and the ET6205 TPU were also tested.
The heading solution for the system was already established from previous work with this
vessel and mount system. The POS MV heading solution (and associated vector between
antennas) is called a GNSS Azimuth Measurement System (GAMS). The final values derived
are as follows: X = 0.022m, Y = -2.005m, and Z = 0.008m.
Another vector derived from the data is the Primary GNSS antenna to the survey Reference
Point (selected as the target on top of the IMU). This vector was manually measured but
further refinement was possible through analysing the POS MV data acquired during the
various survey days. The final values derived are as follows: X = -0.220m, Y = 1.034m, and Z
= -0.971m.
Finally, a combination of physical measurements and design drawings for the USM mount
were used to derive a final lever arm vector for the Reference Point to the Acoustic Centre of
the ET6205. This vector is required to provide proper motion compensation and positioning
for the MPES data. The final values derived are as follows: X = -0.063m, Y = 0.401m, and Z =
1.764m.
13 Noosa Council - Noosa River Survey 20.06.2019
Section 41
Calibration of the ET6205 transducer mounting relative the vessel reference frame was
achieved through a Patch Test conducted during the system trials with MES on the Brisbane
River. A spot check for the Roll bias was conducted from the offshore area of the Noosa River
survey. The final bias values for the sonar are shown in the figures below.
Figure 12: Bias values and lever arms used during processing for the Edgetech 6205 Port transducer.
Figure 13: Bias values and lever arms used during processing for the Edgetech 6205 Starboard
transducer.
14 Noosa Council - Noosa River Survey 20.06.2019
Section 42
5.0 Data Processing
The bathymetry data were processed in the QPS Qimera package using the following
workflow:
• Load logged DB files;
• Convert raw Range/Theta data to a geospatially corrected (XYZ) solution resulting in
the creation of QPD files;
• Generate a Dynamic Surface;
• Load and apply processed positioning and orientation data from the Applanix POSPAC
MMS software;
• Load and apply any extra SVP files from the Sontek Castaway CTD;
• Apply a weak Spline Filter to flag anomalous soundings as REJECTED;
• Manually clean (REJECT) any soundings deemed inconsistent with the river bed / sea
bed or associated features that may be a hazard to navigation;
• Check Shallow and Deep Surfaces for any remaining anomalous soundings;
• Grid data at 0.5m and 1m bin sizes using a Weighted Moving Average algorithm with
a Weight Diameter of 3.
• Export data products in a variety of formats.
Some minor modifications to this general workflow were implemented for selected lines and
areas (e.g., differing levels of Spline filtering or Beam Number filtering).
The single beam echo sounder (SBES) and land transect data were manually processed to
remove anomalous data spikes and then reduced to AHD. A comparison between SBES data
and the gridded swath bathymetry data was conducted prior to interpolation to allow
extraction of contours across the sand shoals inside the Noosa River entrance. Mean and
median differences between the two data sets was <10cm and deemed acceptable for the
survey objectives.
Figure 14: Results of cross check comparison between SBES point data and gridded swath bathymetry
data.
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Section 43
Selected lines sidescan sonar data were processed in the Chesapeake Technology SonarWiz
package using the following workflow:
• Load XTF files as exported from QINSy;
• Check real-time bottom tracking (for slant range correction of imagery) and if necessary
re-track using automated or manual techniques;
• Build Empirical Gain Normalisation (EGN) curves for main lines of each block. Apply
EGN to files for image enhancement;
• If necessary, adjust DC gain associated with selected lines to better match image
intensity across all lines used to create the mosaic;
• Save final / acceptable mosaic as a gray-scale GeoTiff (palette assigned acoustic
shadows as dark pixels and high backscatter returns as light pixels).
Data deliverables included:
• Ungridded, geospatially-corrected, cleaned bathymetry points;
• Gridded, geospatially-corrected, cleaned bathymetry points;
• Contours at 0.5m in DXF format;
• 8-bit backscatter mosaics of selected survey areas;
Although not delivered as part of the initial data set, we intend to assemble and submit a
Fledermaus Scene that captures all available data acquired during the survey operations and
supplied by Noosa Council as background information. We view this Scene as being
potentially useful for illustrating riverbed / seabed features that exist across the Noosa River.
16 Noosa Council - Noosa River Survey 20.06.2019
Section 44
6.0 Results
As this project was essentially a data gathering exercise the Results section is limited to
observations about the survey operations, internal consistency of new data, comparison to
existing bathymetric data, and some brief comments about the backscatter data acquired as
part of the survey (and how it might assist future Noosa Council projects).
Survey Operations
As a whole the survey operations went well. No equipment failures occurred and all system
deployments/recovery were conducted in a safe manner. Afternoon survey operations were
interrupted on a couple of days because of thunderstorms but close monitoring of weather
fronts via local radar ensured that all personnel were off the water before any danger of
lightning strikes occurred.
Tides were not particularly favourable during the survey or the Noosa River was shallower
than anticipated / hoped (in terms of clearance of the sonar equipment from the bottom). This
resulted in a narrower swath width per survey line and hence more lines required to provide
proper infill over the specified areas. Moored vessels also required some deviations and
additional infill. However, the area covered over the allocated 5 days of surveying was
substantial and I think provides a good baseline for future monitoring efforts.
The figures below highlight some of the features mapped along the river.
Figure 15: River depths at the upstream extent of the survey near the ferry crossing. A shallow sand bar
prevented complete mapping along the eastern bank. The hole to the south of ferry crossing is
approximately 7m deep (AHD).
17 Noosa Council - Noosa River Survey 20.06.2019
Section 45
Figure 16: Rocks and sand wave field around the Marina where vessel was moored each evening.
Figure 17: Munna Point Bridge region
18 Noosa Council - Noosa River Survey 20.06.2019
Section 46
Figure 18: Dog Beach region.
Figure 19: Noosa River Entrance region with large offshore sand bank.
Supplementing the swath bathymetry coverage were land transects and a single beam
echosounder (SBES) survey conducted over sections of the Noosa River and Entrance that
19 Noosa Council - Noosa River Survey 20.06.2019
Section 47
were too shallow for safe operation of the MPES equipment. The figure below shows the
location of these survey points.
across the Noosa River survey region.
Interpolation between these transects combined with the swath bathymetry data allowed the
creation of contours map for NC (supplied as a DXF file). All the geospatially-corrected and
cleaned data were provided to NC for gridding/interpolation using alternative techniques.
Figure 20: Contours across the Noosa River Entrance region.
20 Noosa Council - Noosa River Survey 20.06.2019
Section 48
Comparison to Existing Bathymetry and Future Surveys Comparison of the 2019 data set to existing bathymetry across the survey area was somewhat limited. The internal check between the 2019 swath bathymetry and 2019 SBES bathymetry showed a mean difference of around 10cm which was deemed acceptable by NC. The raw 2010 SBES data were not made available for this study but charts showing derived contours were provided as PDFs. Selected sections of these PDFs were converted to Geotif format and imported to a Fledermaus Scene for comparison against the 2019 swath bathymetry. The charts were registered at selected contour heights within the Scene and compared to the contours extracted from the swath bathymetry. In both upstream and downstream locations where presumed minimal erosion or deposition had occurred (e.g., in a protected marina) the two data sets aligned well. As such, our AHD reduction closely matches that used for the 2010 data set. The 2019 swath bathymetry data set should be an invaluable tool for evaluating future changes in the Noosa River waterway, complimenting existing Lidar data across the region. Alternative techniques to acoustic sonars may be more economically proficient for future large-scale mapping of the river system (e.g., LIDAR systems affixed to drones, Satellite Derived Bathymetry) but the swath techniques employed as part of this survey could be used for more local monitoring of “problem” areas within the river or areas undergoing development. 21 Noosa Council - Noosa River Survey 20.06.2019
Section 49
Backscatter Data
Although backscatter data wasn’t a focus of this project the data were logged and selected
regions processed to create mosaics. The sidescan-type backscatter data produced by the
ET6205 provide finer detail of riverbed features than the bathymetry data, and can be used to
make inferences about seabed types (e.g., the bathymetry was gridded at a 50cm bin size
whereas the sidescan sonar data was gridded at a 10cm bin size). In general, finer sediments
that absorb signal strength appear as darker pixels and coarser sediments that return more
signal appear as lighter/brighter pixels.
The example below comes from an area along Hilton Terrace. The sidescan imagery extends
to the shoreline and shows a rock-strewn area amongst softer sediments. In this case the
mosaic doesn’t show pronounced changes in backscatter strength, but the textural
information suggests may be used to show more cemented or consolidated areas relative to
soft sediment areas.
Figure 21: Example backscatter mosaic along Gympie Terrace shoreline.
A more extensive analysis of the backscatter data is intended prior to further geophysical
work involving a subbottom profiler (SBP) system. The SBP data should allow identification of
sand regions in advance of a dredging program.
22 Noosa Council - Noosa River Survey 20.06.2019
Section 50
7.0 Summary The 2019 swath bathymetry and backscatter survey was a success in terms of providing very detailed information about riverbed features within the catchment and the offshore area around the entrance to the Noosa River. The data should assist the current modelling efforts for bank erosion, and future promotional presentations for the general Noosa public. Although a quantitative assessment of the 2010 SBES survey and the 2019 swath bathymetry survey wasn’t possible, the qualitative comparison between the 2010 charts and 2019 contours looks good. The 2019 contours extracted from the swath bathymetry align nicely with the contours in the 2010 charts in test areas presumed to be free of substantial deposition or erosion. The backscatter data acquired with the bathymetry data should be useful for future programs planned by the Noosa Council. A small section of the data was presented in this report but more exists across all of the survey area. Possible uses of the data include seabed characterisation (regional and local), identification of features within the river (e.g., debris, rock areas, etc.), and monitoring of slips/slides along the banks of the river. Although other techniques might be adopted for regional surveying of the river in the future (e.g., drone-based Lidar or Satellite Derived Bathymetry) the acoustically derived data that is a part of this survey provides a highly detailed snapshot in time of the current Noosa River state. As such, it will be invaluable for future monitoring efforts. The detailed imagery should also be of interest to the Noosa public and AI will continue to assist the Noosa Council in generating products that might illustrate the work conducted here. 23 Noosa Council - Noosa River Survey 20.06.2019
Section 51
Noosa Spit SEMP Final Report C-1 Proposed Conceptual Options (PCG 2019) Appendix C Proposed Conceptual Options (PCG 2019) G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\R.B23636.001.02.SEMP_final.docx
Section 52
Noosa Spit SEMP Options
Assessment
Noosa Spit SEMP Options
AssessmentSection 53
1. Nourishment Options A: Collection of sediment from the central channel is used to nourish the beach and provide a sand slug to block the southern channel. . <Insert Report Title> Page 1
Section 54
B: Collection of sand from the southern spit is undertaken using a connection to the existing Sand Recycling System and pumped into the erosion zone. <Insert Report Title> Page 2
Section 55
2. River Mouth Control Structures A: Lengthening of the existing spit groyne to increase sediment trapping and decrease sediment bypassing into the river mouth, with a sediment pathway that is more likely to bypass the river mouth entirely due to sediment being mobilised in deeper water. <Insert Report Title> Page 3
Section 56
B: New groyne on the northern side of the river mouth to prevent sand entering the river under seasonal northerly wind and wave conditions, preventing the accumulation of sand that creates the northern spit within the river mouth. <Insert Report Title> Page 4
Section 57
C: Extension of existing control structures to increase the embaymentisation of the Doggie Beach area. <Insert Report Title> Page 5
Section 58
3. Local Structures A: Extension of the submerged structure and additional small groynes along the Dog Beach as per the proposed Stage 2 designed under the works undertaken by the Sunshine Coast Council. <Insert Report Title> Page 6
Section 59
B: Small groyne field to stabilise the beach front.
<Insert Report Title> Page 7
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5 1 1 1 52 1 3325 2224 20 20 62 VSection 60
C: Terminal wall along Dog Beach.
<Insert Report Title> Page 8
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. s “Section 61
Noosa Spit SEMP Final Report D-1 Risk Assessment Appendix D Risk Assessment G:\Admin\B23636.g.mpb.NoosaSpit_SEMP\R.B23636.001.02.SEMP_final.docx
Section 62
Current State (Base Case) OPTION 1a: Beach Nourishment: Dual plug and shoreline nourishment. OPTION 1b: Beach Nourishment: Single plug and shoreline nourishment. OPTION 2: Extension of Existing Training Wall OPTION 3: Extension of Existing Submerged Breakwater OPTION 4: Groyne Field OPTION 5: Seawall along Beach OPTION 6: Do Nothing (Accept Impacts)
Risk Categories & Management Risk Assessment Risk Assessment Risk Assessment Risk Assessment Risk Assessment Risk Assessment Risk Assessment Risk Assessment
Risk Description/Treatment Risk Description/Treatment Risk Description/Treatment Risk Description/Treatment Risk Description/Treatment Risk Description/Treatment Risk Description/Treatment Risk Description/Treatment
Unstable river bank and falling trees could cause Consequence Medium Nil Consequence Insignificant Nil Consequence Insignificant Slip Hazard on structure resulting in injury. Introduction of a Consequence Major Submerged structure presents navigation hazard and may be struck Consequence Major Slip Hazard on structure resulting in injury. Introduction of a submerged Consequence Major Trip/slip hazard when exposed. Potentail climbing/play structure that could Consequence Medium Unstable river bank and falling trees could cause injury to staff Consequence Medium
injury to staff and public. This may result in an Likelihood Possible Likelihood Rare Likelihood Rare submerged hazard may result in injuries when diving, swimming or Likelihood Possible by boat, causing serious injury. This may result in an increase in Likelihood Possible hazard may result in injuries when diving, swimming or boating near Likelihood Possible lead to injuries. Likelihood Possible and public. This may result in an increase in insurance claims for Likelihood Possible
RISK increase in insurance claims for accidents. boating near them. This may result in an increase in insurance claims insurance claims for accidents. them. This may result in an increase in insurance claims for accidents. accidents.
Risk Rating Medium (M52) Risk Rating Low (L4) Risk Rating Low (L4) for accidents. Risk Rating High (H72) Risk Rating High (H72) Risk Rating High (H72) Risk Rating Medium (M52) Risk Rating Medium (M52)
Workplace & Public Safety Exclusion of public from affected area using fencing, Consequence Medium N/A Consequence Insignificant N/A Consequence Insignificant Adequate signage/navigation aids of submerged hazards. Ensure Consequence Medium Adequate signage/navigation aids of submerged hazards. Council to Consequence Medium Adequate signage/navigation aids of submerged hazards. Council to hold Consequence Medium Exclusion of public from area when it is exposed using appropriate barriers Consequence Medium Exclusion of public from affected area using fencing, barriers Consequence Medium
barriers and signage. Council to hold appropriate Likelihood Unlikley Likelihood Rare Likelihood Rare central channel is used for boat traffic.Council to hold appropriate Likelihood Unlikley hold appropriate insurance coverage for liability and accidents. Likelihood Unlikley appropriate insurance coverage for liability and accidents. Likelihood Unlikley and signage. Council to hold appropriate insurance coverage for liability Likelihood Unlikley and signage. Council to hold appropriate insurance coverage for Likelihood Unlikley
TREATMENT insurance coverage for liability and accidents. insurance coverage for liability and accidents. and accidents. liability and accidents.
Residual Residual Residual Residual Residual Residual Residual Residual
Medium (M48) Low (L4) Low (L4) Medium (M48) Medium (M48) Medium (M48) Medium (M48) Medium (M48)
Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating
Public perception of mismanagment if no action is Consequence Medium Compliants about noisy machinery and the physical appearance of the Consequence Insignificant Complaints about noisy machinery and the physical appearance of the Consequence Insignificant Intial complaints driven by change to navigation of river. Perception of Consequence Insignificant Complaints about delivering a project that is expected not to work Consequence Medium Intial complaints driven by loss of visual amenity. Consequence Low Perception of "over management" or "too much money being spent" during Consequence Low Public perception of mismanagment if no action is taken to Consequence Medium
taken to prevent breakthrough or repair erosion; Likelihood Likely machinery on the beach, in excess of positive feedback. Likelihood Unlikely machinery on the beach, in excess of positive feedback. Likelihood Unlikely "over management". Likelihood Likely well. Likelihood Likely Likelihood Possible construction. Public perception that seawall is visually unaesthetic. Likelihood Likely prevent breakthrough or repair erosion; potential ncrease in Likelihood Likely
RISK
potential increase in complaints to Council and the complaints to Council and the media.
Risk Rating High (H56) Risk Rating Low (L8) Risk Rating Low (L8) Risk Rating Low (L16) Risk Rating High (H56) Risk Rating Medium (M32) Risk Rating Medium (M36) Risk Rating High (H56)
media.
Reputational
Undertake SEMP; provide strong messaging and Consequence Low Strong media messaging around the project, the tools to be deployed and Consequence Insignificant Strong media messaging around the project, the tools to be deployed and Consequence Insignificant Strong media messaging around the decision, upfront messaging about Consequence Insignificant Targetted messaging to align some of the expectations. Consequence Medium Strong media messaging about visual aspect of solution during project Consequence Low Strong media messaging around the decision, upfront messaging about Consequence Low Strong media messaging around the decision and cost/benefits Consequence Medium
communications of SEMP outcomes by Council Likelihood Possible what this solution provides and avoids. Public consultation to reduce Likelihood Rare what this solution provides and avoids. Public consultation to reduce Likelihood Rare visual aspects during project development, long term spreading of Likelihood Unlikley Likelihood Possible development. Conduct public consultation, where appropriate. Likelihood Unlikley visual aspects during project development, long term spreading of costs. Likelihood Unlikley by Council leaders; ; include public consultation, where Likelihood Possible
TREATMENT
leaders; include public consultation, where Residual complaints. Residual complaints. Residual costs. Conduct public consultation, where appropriate. Residual Residual Residual Seawall to be buried. Residual appropriate. Residual
appropriate. Medium (M32) Low (L4) Low (L4) Low (L8) Medium (M52) Low (L24) Low (L24) Medium (M52)
Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating
Political stakeholder intervention from local and/or Consequence Major Political stakeholder intervention due to the solution requiring expense of Consequence Medium Political stakeholder intervention due to the solution requiring expense of Consequence Medium Political stakeholder intervention due to the solution requiring expense Consequence Medium Political stakeholder intervention due to the implementation of a Consequence Major Political stakeholder intervention due to the solution requiring expense of Consequence Medium Political stakeholder intervention due to the solution taking a infrastructure Consequence Medium Political stakeholder intervention from local and/or state Consequence Major
state government due to breakthrough impacting Likelihood Likely public funds for protection of limited area. Individual views on visual or Likelihood Possible public funds for protection of limited area. Individual views on visual or Likelihood Possible of public funds for protection of limited area. Individual views on visual Likelihood Possible 'legacy' design from Sunshine Coast Regional Council that has been Likelihood Likely public funds for protection of limited area. Individual views on visual or Likelihood Possible "heavy" direction, large expense of public funds for protection of limited Likelihood Likely government levels due to breakthrough impacting Noosa Sound Likelihood Likely
RISK Noosa Sound properties and boat moorings and due environmental impacts may not align with the option. environmental impacts may not align with the option. or environmental impacts may not align with the option. shown to be ineffective and expensive. environmental impacts may not align with the option. area. properties and boat moorings and due to loss of recreational
to loss of recreational amenity. Risk Rating Extreme (E84) Risk Rating Medium (M52) Risk Rating Medium (M52) Risk Rating Medium (M52) Risk Rating Extreme (E84) Risk Rating Medium (M52) Risk Rating High (H56) amenity. Risk Rating Extreme (E84)
Political Strong stakeholder involvement during the planning Consequence Medium Seek supporting 'natural' secondary solution that could alleviate short term Consequence Insignificant Strong stakeholder involvement with the decision making process. Seek Consequence Low Strong stakeholder involvement with the decision making process. Seek Consequence Low Nil Consequence Major Strong stakeholder involvement with the decision making process. Seek Consequence Low Strong stakeholder involvement with the decision making process. The long Consequence Medium Strong stakeholder involvement with the decision making Consequence Major
and decision making process. Likelihood Possible concerns and increase overall benefits. Likelihood Unlikley public feedback about dredge campaigns. Likelihood Possible public feedback about extension of existing structure. Likelihood Possible Likelihood Likely public feedback about similar structures at Munna Point and Likelihood Possible term benefits, seeking of public funds, spreading of costs. Likelihood Possible process. Likelihood Possible
Maroochydore.
TREATMENT
Residual Residual Residual Residual Residual Residual Residual Residual
Medium (M52) Low (L8) Medium (M32) Medium (M32) Extreme (E84) Medium (M32) Medium (M52) High (H72)
Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating
Litigation from property owners in Noosa Sound due Consequence Extreme Difficulty in obtaining regulatory approvals, particularly from the Consequence Low Difficulty in obtaining regulatory approvals, particularly from the Department Consequence Low Nil Consequence Insignificant Boats damaged by impacting submerged structure may seek Consequence Low Nil Consequence Insignificant Difficulty in obtaining regulatory approvals for a large structure in the Consequence Medium Litigation from property owners in Noosa Sound due to reduced Consequence Extreme
to reduced protection from hazards causing damage Likelihood Possible Department of Fisheries given ongoing nature of project and possible Likelihood Possible of Fisheries given ongoing nature of project and possible disruption to Likelihood Possible Likelihood Rare recourse. Potential increase in insurance cases and legal disputes. Likelihood Unlikely Likelihood Rare coastal zone. Likelihood Possible protection from hazards causing damage to properties. Likelihood Possible
to properties. disruption to adjacent fish habitat zone. adjacent fish habitat zone. Implementation of a strategy that is not consistent with the
Implementation of a strategy that is not consistent State Coastal Management Plan (2016) could present
RISK
with the State Coastal Management Plan (2016) could legal/regulatory issues and non-approval from the State.
Risk Rating Extreme (E82) Risk Rating Medium (M32) Risk Rating Medium (M32) Risk Rating Low (L4) Risk Rating Low (L24) Risk Rating Low (L4) Risk Rating Medium (M52) Risk Rating Extreme (E82)
present legal/regulatory issues and non-approval from
the State.
Legal, Governance & Regulatory Collaborate with relevant stakeholder at government Consequence Low Strong stakeholder engagement with regulatory bodies to assist in defining Consequence Insignificant Strong stakeholder engagement with regulatory bodies to assist in defining Consequence Insignificant N/A Consequence Insignificant Adequate signage/navigation aids of submerged hazards. Council to Consequence Low N/A Consequence Insignificant Strong stakeholder involvement with the planning and decision making Consequence Insignificant Reduce risk of litigation by making residents aware of risks as Consequence Low
and industry level to ensure regulatory compliance; Likelihood Unlikley the detailed design. Strong long-term, multi criteria assessment. Strong Likelihood Rare the detailed design. Strong long-term, multi criteria assessment. Strong Likelihood Rare Likelihood Rare hold appropriate insurance and seek legal advice where needed. Likelihood Unlikley Likelihood Rare process. This could include presenting, preparing reports/findings and Likelihood Rare per advice from King and Co. (lawyers); Implementation of this Likelihood Unlikley
Undertake SEMP and provide strong messaging of its compliance reporting to assure stakeholders that habitat zones will not be compliance reporting to assure stakeholders that habitat zones will not be Council to seek legal representation for any disputes. collaborating with State Government to get regulatory approval. strategy is still against regulatory guidance; Collaborate with
outcomes to key stakeholder groups, including maintained. maintained. relevant stakeholder at government and industry level to ensure
TREATMENT government and affected industry groups; Seek legal regulatory compliance;
Residual Residual Residual Residual Residual Residual Residual Residual
advice, where appropriate to ensure compliance with Low (L24) Low (L4) Low (L4) Low (L4) Low (L24) Low (L4) Low (L4) Low (L24)
Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating
regulatory and legislative requirements.
Loss of use of the area to reducing numbers of person Consequence Disruption to recreational area leads to temporary loss in tourist trade. Consequence Disruption to recreational area leads to temporary loss in tourist trade. Consequence Disruption to recreational area leads to temporary loss in tourist trade. Consequence Disruption to recreational area leads to temporary loss in tourist Consequence Disruption to recreational area leads to temporary loss in tourist trade. Consequence Disruption to recreational area leads to temporary loss in tourist trade. Consequence Loss of value to Noosa Sound properties due to reduced hazard Consequence
Low Insignificant Insignificant Insignificant Insignificant Insignificant Insignificant Medium
present in the local economy resulting in loss of trade. protection/increased boat traffic adjacent to properties.
potential tourism trade. Likelihood Likley Likelihood Possible Likelihood Possible Likelihood Possible Likelihood Possible Likelihood Possible Likelihood Possible Reduced recreational amenity of the Spit may lead to a drop in Likelihood Possible
user numbers resulting in less tourist trade.
RISK
Risk Rating Medium (M36) Risk Rating Low (12) Risk Rating Low (12) Risk Rating Low (12) Risk Rating Low (12) Risk Rating Low (12) Risk Rating Low (12) Risk Rating Medium (M52)
Economic
Nil Consequence Low Stong media messaging about construction of project and disruptions. Consequence Insignificant Stong media messaging about construction of project and disruptions. Consequence Insignificant Stong media messaging about construction of project and disruptions. Consequence Insignificant Stong media messaging about construction of project and Consequence Insignificant Stong media messaging about construction of project and disruptions. Consequence Insignificant Stong media messaging about construction of project and disruptions. Consequence Insignificant Stong media messaging and economic support to relocate Consequence Low
Likelihood Likley Likelihood Rare Likelihood Rare Likelihood Rare disruptions. Likelihood Rare Likelihood Rare Likelihood Rare users of Noosa Spit to other local regions. Likelihood Unlikley
TREATMENT
Residual Residual Residual Residual Residual Residual Residual Residual
Medium (M36) Low (L4) Low (L4) Low (L4) Low (L4) Low (L4) Low (L4) Low (L24)
Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating
Cost of mitigation is likely to increase substantially in Consequence Major Budget estimates undervalue project, resulting in medium financial loss Consequence Low Budget estimates undervalue project, resulting in medium financial loss Consequence Low Budget estimates undervalue project, resulting in medium financial loss Consequence Low Budget estimates undervalue project, resulting in medium financial Consequence Low Budget estimates undervalue project, resulting in medium financial loss. Consequence Low High up-front capital costs, complex construction in a difficult enviornment Consequence Medium Cost of mitigation is likely to increase substantially in the event Consequence Major
the event of breakthrough event. Likelihood Almost Certain Likelihood Unlikely Likelihood Unlikely Likelihood Possible loss Likelihood Possible Likelihood Possible leads to financial variation risk. Likelihood Possible of breakthrough event. Likelihood Almost Certain
RISK
Risk Rating Extreme (E88) Risk Rating Low (L24) Risk Rating Low (L24) Risk Rating Medium (M32) Risk Rating Medium (M32) Risk Rating Medium (M32) Risk Rating Medium (M52) Risk Rating Extreme (E88)
Financial
Implement SEMP; ensure strong project Consequence Medium Early tenderer engagement to refine scope and costs. Strong Consequence Low Early tenderer engagement to refine scope and costs.Strong communication Consequence Low Early tenderer engagement to refine scope and costs.Strong Consequence Low Early tenderer engagement to refine scope and costs. Strong Consequence Low Early tenderer engagement to refine scope and costs. Strong Consequence Low Early tenderer engagement to refine scope and costs. Strong Consequence Low Have a Council budget allocated to in the event of a Consequence Medium
management pirnciples are applied in order to Likelihood Possible communication and partnering with the right supplier to ensure time and Likelihood Unlikley and partnering with the right supplier to ensure time and costs are managed Likelihood Unlikley communication and partnering with the right supplier to ensure time Likelihood Unlikley communication and partnering with the right supplier to ensure Likelihood Unlikley communication and partnering with the right supplier to ensure time and Likelihood Unlikley communication and partnering with the right supplier to ensure time and Likelihood Unlikley breakthrough. Apply strong project management skills to Likelihood Almost Certain
TREATMENT appropriately manage the project costs. costs are managed appropriated. appropriated. and costs are managed appropriated. time and costs are managed appropriated. costs are managed appropriated. costs are managed appropriated. manage budget allocation.
Residual Residual Residual Residual Residual Residual Residual Residual
Medium (M52) Low (L24) Low (L24) Low (L24) Low (L24) Low (L24) Low (L24) High (H60)
Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating Risk Rating
Significant, permenant loss of terrestrial vegetation Consequence Medium Ongoing nourishment project will cause continual short term impacts on Consequence Low Ongoing nourishment project will cause continual short term impacts on Consequence Medium Limited short term disruption to local environmental values, limited Consequence Low Limited short term disruption to local environmental values, limited Consequence Low Limited short term disruption to local environmental values, limited long Consequence Low Significant, short term disruption to local environmental values, but long Consequence Medium Significant, permanent loss of terrestrial vegetation and Consequence Medium
and wetlands, ongoing and unmitigated erosion will Likelihood Almost Certain local environmnetal values. Dredge extraction areas can be targeted to Likelihood Possible local environmental values. Dredge extraction areas can be targeted to avoid Likelihood Possilbe long term stabilisation of habitat. Nourishment after constrcution Likelihood Almost Certain long term stabilisation of habitat. Nourishment after constrcution Likelihood Likely term stabilisation of habitat. Nourishment after constrcution likely to Likelihood Likely term stabilisation of habitat. Nourishment after constrcution likely to casue Likelihood Likely wetlands, ongoing and unmitigated erosion will cause loss of Likelihood Almost Certain
cause loss of habitat. Future mitiagtion options likely avoid environmnetally sensitive areas. Greater spacing between environmentally sensitive areas. likely to casue localised disruption ot environmental values. likely to casue localised disruption ot environmental values. casue localised disruption ot environmental values. localised disruption to environmental values. habitat. Future mitiagtion options likely to be more extensive
to be more extensive and cause greater nourishment allows some reduction in impact. and cause greater environmental harm.
RISK
environmental harm.
Risk Rating High (H60) Risk Rating Medium (M32) Risk Rating High (H60) Risk Rating Medium (M40) Risk Rating Medium (M36) Risk Rating Medium (M36) Risk Rating High (H56) Risk Rating High (H60)
Environmental
Implement SEMP to reduce environmental harm and Consequence Medium Nourishment footprint to be carefully selected and programed to avoid Consequence Low Nourishment footprint to be carefully selected and programed to avoid most Consequence Low Design of structures to incorporate fih habitat zone. Stabilisation of Consequence Low Design of structures to incorporate fih habitat zone. Stabilisation of Consequence Insignificant Design of structures to incorporate fish habitat zone. Stabilisation of river Consequence Insignificant Design detailing to incoporate habitat reestablishment and stabilise existing Consequence Low Nil Consequence Medium
damage. Likelihood Possible most disruptive times and locations. Careful multi-criteria monitoring to Likelihood Unlikley disruptive times and locations. Careful multi-criteria monitoring to assess Likelihood Possilbe river bank will prevent further loss. Nourishment footprint to be Likelihood Unlikley river bank will prevent further loss. Nourishment footprint to be Likelihood Unlikley bank will prevent further loss. Nourishment footprint to be carefully Likelihood Unlikley habitat. Nourishment footprint to be carefully selected and programed to Likelihood Unlikley Likelihood Almost Certain
TREATMENT
Residual assess and adapt to impacts. Residual and adapt to impacts. Residual carefully selected and programed to avoid most disruptive times and Residual carefully selected and programed to avoid most disruptive times and Residual selected and programed to avoid most disruptive times and locations. Residual avoid most disruptive times and locations. Residual Residual
Medium (M52) Low (L24) Medium (M32) Low (L24) Low (L8) Low (L8) Low (L24) High (H60)
Risk Rating Risk Rating Risk Rating locations. Risk Rating locations. Risk Rating Risk Rating Risk Rating Risk Rating
Residual Risk Average Medium (M43) Residual Risk Average Low (13) Residual Risk Average Low (18) Residual Risk Average Low (L21) Residual Risk Average Medium (35) Residual Risk Average Low (L21) Residual Risk Average Low (L25) Residual Risk Average Medium (M49)
Highest Residual Risk in Option Medium (M52) Highest Residual Risk in Option Low (L24) Highest Residual Risk in Option Medium (M32) Highest Residual Risk in Option Medium (M48) Highest Residual Risk in Option Extreme (E84) Highest Residual Risk in Option Medium (M48) Highest Residual Risk in Option Medium (M52) Highest Residual Risk in Option High (H60)
Legend:
Section 63
BMT has a proven record in addressing today’s engineering and
environmental issues.
Our dedication to developing innovative approaches and solutions
enhances our ability to meet our client’s most challenging needs.
1
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