Cell Descriptions - South East Natural Resources Management Board

SE12 – Cape Jaffa
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
decadal scale.
Impacts and implications Protect and manage Address landscape
(for this cell) habitat threats issues: fire,
connectivity,
refuges, hydrology
This cell presents a pattern of
dune habitats sensitive to
change.
Increase in beach recession,
storm foredune damage and
dune ridge instability. Loss of
small cliff-backed pocket
beaches.
Foredune damage could lead
to widespread dune destabilisation
and transport of
sand across dunes to the
adjacent farmland.
Shoreline recession in many
places will continue as far as
the calcarenite bluff at the
back of the beach: thus, a
change in the character of the
shoreline, from narrow low
energy beach to low cliffs.
2030: Occasional storm tide
flooding above highest known
tides.
2070: Frequent storm damage
to foredunes.
Create a baseline for
shoreline, dune and
lake change by
establishing a rectified
aerial photographic
record at an
appropriate resolution.
Active management of
dune blowouts.
Maintain an aerial
photographic record
of change.
Create buffer zone to
allow dune retreat
where feasible.
Active management of
dune blowouts.
The creation of
buffer zones to
allow retreat of tide
dependant
ecosystems a
regional issue with
local implications.
Intensity of large
storms increases.
Warmer average
conditions:
2030:+0.3 to.6 0 C
2070:+1.5 to 2 0 C
(Impacts uncertain. Existing
terrestrial vegetation is found
in warmer conditions
elsewhere)
Maintain
connectivity of
vegetation within
the region.
Drier average
conditions:
2030: -2% to 5%
2070: - 10% to 20%
Groundwater
lowering; saline
incursion:
Nearshore sea
Dune vegetation adapts to
drier conditions, but recovers
more slowly from fire and
storm damage allowing weed
colonisation, notably exotic
grasses: dune mobilization
becomes more likely.
Groundwater lowering a threat
to dune vegetation.
Changes are unlikely to affect
Active weed control
within dunes.
Adaptive management
of ecological assets.
Lowering of
regional water table
(and perched water
tables in dunes) a
threat to all habitats.
Limestone Coast and Coorong Coastal Action Plan 417