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2021-11-15 GC Agenda - Item 7 - Attachment 1 - Coastal Hazards Adaptation Plan
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Log in to see the plans as drawn Noosa Coastal Hazards Adaptation Plan
Figure 4 shows an example of the potential extent mark susceptible to the effects of erosion will
of coastal erosion that may occur during a major increase landward compared to today.
oceanic storm event, by the year 2100, for a
portion of Peregian Beach (adjacent to Peregian What are tidal inundation and
Beach Park). Due to the narrow distances between
each erosion extent projection, the results for other storm tides?
igure 4 shows an example of the extent of potential coastal erosion during a major oceanic storm
years
vent, for the year and
2100, for alocations modelled
portion of Peregian Beachcan be explored
(adjacent to Peregian in
Beach Park).As
Duethe sea levels rise, low-lying areas will be
o the narrow distances between each erosion extent projection, the results for other years and
detail using Council’s interactive mapping website.
cations modelled can be explored in details using Council’s interactive mapping website. exposed to more frequent inundation under
everyday conditions and also with storm tides.
In addition to a worsening of inundation in
locations that already experience it, some areas
not previously exposed to inundation will also
be effected. This plan deals with two types of
inundation hazard – permanent tidal inundation
and storm tide inundation. In subsequent sections
of this plan, these will collectively be referred to
as ‘periodic tidal inundation’.
Permanent tidal inundation
As sea levels rise, the level of tidal waters
increases in elevation in relation to the shoreline,
covering low-lying areas with sea water. In
practice, this will look like a very significant ‘king
tide’. Though instead of occurring every so often
as occurs with ‘king tides’ today, it will instead
occur from two to three days per month in some
locations, and almost every day in others (i.e.
locations close to the present-day shoreline) when
the tide peaks. In the absence of any adaptation
Figure
Figure 4
4 --Erosion
Erosion Prone
Prone Area
Area during during
a 100 a 100-year
ARI marine storm eventAverage
in 2100
Recurrence Interval (ARI) marine storm event in 2100
response, this frequent or permanent inundation
n South-East Queensland, significant erosion on sandy beaches is common after high-energy will mean, in some areas, the ground will be
ave events such as storms, east coast lows and tropical cyclones. Open sandy beaches such as
near-permanently saturated, and in other areas,
astaways Beach are naturally kept
In South-East in balance as sand
Queensland, is eroded from
significant the beach and taken
erosion
ffshore by storms, but is then gradually pushed back onto the beach during calmer conditions. periods of reduced access to recreational spaces,
More frequent onand sandy beaches
severe storm is common
events coupled with seaafter high-energy
level rise make shoreline recession along
much of Noosa Shire’s coastline very likely (State of Queensland, 2011). This means that when roads and footpaths which can cause nuisance to
wave events such as storms, East Coast Lows and
rger storm events occur in future, the area of land above the high-water mark susceptible to residents
the and visitors alike.
Tropical
ffects of erosion Cyclones.
will increase landward Open
compared sandy
to today.beaches such as
Castaways Beach are naturally kept in balance as To understand how far this water may travel inland,
What are tidal inundation and storm tides? tidal waters were modelled to show the maximum
sand is eroded from the beach and taken offshore
s the sea levels rise, low-lying areas will be exposed to
by storms, but is then gradually pushed back onto more frequent inundation under extent under calm conditions18. The results of
everyday
onditions and also with storm tides. In addition to a worsening of inundation in locations that
the beach during calmer conditions. More frequent this by the year 2100 can be seen in Figure 5.
oosa Council –and severe storm events coupled with sea level
Coastal Hazards Adaptation Plan Additional
Page 16 images of permanent tidal inundation
rise make shoreline recession along much of extent for the entire Noosa coastal zone across
Noosa Shire’s coastline very likely . This means 17 other years can be found in Appendix 3. These
that when higher-intensity storm events occur in map layers can also be explored in greater detail
the future, the area of land above the high-water using Council’s interactive mapping website.
17
tate of Queensland (2011). Queensland Coastal Processes and Climate Change
S
18
For more information, see BMT WBM (2018)’s Phase 3 – Coastal Hazards Modelling Report (Noosa Shire
Council Coastal Hazards Risk, Vulnerability and Adaptation Assessment: Coastal Hazard Mapping Refinement)
Page 23
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