Cell Descriptions - South East Natural Resources Management Board

SE11 – Guichen Bay
Tiny areas of wetland, such as McInnes Swamp, trapped behind the dune ridge barrier, and
around small lakes near the mouth of drain L, are high value exceptions to this pattern. Here
habitat for the focal species Swamp Skink, Southern Bell Frog and Yellowish Sedge-skipper,
together with a moderate overall wetland value score, raises the total.
Threat Analysis (GIS)
Guichen Bay has the highest total of threat summary means in the region, 74.69. High threat
values are distributed throughout the cell, with no part having medium or low totals.
Development zoning is a high average as primary industry zoning is extensive; private land
ownership is extensive with the exception of the foredune which is unallotted Crown land or
park; many residential dwellings within the Guichen Bay dune ridges raise the total for existing
development; land use and mining; significant weeds are widely distributed through the partially
cleared dunes; numbers of feral animals and dune instability, all make significant contribution to
this total.
Adaptation to Climate Change: Threats for cell SE11
(see also discussion of scenario in Section 4.11
NOTE: the advice below is indicative of likely change and the direction of change, with
implications for ecosystems. Dates, amounts and probabilities cannot be accurately calculated at
this time. Thus advice on flood levels, for example, should not be used in engineering or
development planning.
Climate change
element/ scenario
Combined climate
changes and sea
level rise
throughout this
cell
Sea level rise:
2030 : +c.20cm
2070: +c.80cm.
Storms:
Frequency continues
to show great
variation on a
Impacts and implications Protect and manage Address landscape
(for this cell) habitat threats issues: fire,
connectivity,
refuges, hydrology
This cell presents a complex
pattern of habitats sensitive to
change.
Increase in beach recession,
storm foredune damage and
dune instability. Loss of small
cliff-backed pocket beaches at
the northern and southern
ends of the bay.
Acceleration of calcarenite cliff
erosion.
Foredune damage could lead
to widespread dune destabilisation
and transport of
sand across dunes to the lakes
and farmland.
2030: Occasional storm tide
flooding above highest known
tides. Lidar data suggests that
marine incursion will ingress to
Create a baseline for
shoreline, dune and
lake change by
establishing a rectified
aerial photographic
record at an
appropriate resolution.
Maintain an aerial
photographic record
of change.
Create buffer zone to
allow dune retreat
where feasible.
Continue to monitor
recession and address
hazards as required.
Active management of
dune blowouts.
Manage sill on drain L
tidal inlet to adjust to
higher marine storm
elevations as part of
The creation of
buffer zones to
allow retreat of tide
dependant
ecosystems a
regional issue with
local implications.
Limestone Coast and Coorong Coastal Action Plan 404