Cell Descriptions - South East Natural Resources Management Board

SE1 – Piccaninnie Ponds
Climate change
element/ scenario
Storms:
Frequency continues
to show great
variation on a
decadal scale.
Intensity of large
storms increases.
Warmer average
conditions:
2030:+0.3 to.6 0 C
2070:+1.5 to 2 0 C
Drier average
conditions:
2030: -2% to 5%
2070: - 10% to 20%
‘Flashy’ run off:
Drier creeks, but
larger rare floods
Groundwater
lowering; saline
incursion:
Nearshore sea
changes -
temperature;
acidity; wave
Impacts and implications Protect and manage Address landscape
(for this cell) habitat threats issues: fire,
connectivity,
refuges, hydrology
for the threats to the CP
and coastal lowlands.
Sandy coast has marked
recession, (low sand storage
volume), foredune blowouts,
and dune transgression.
Beach and nearshore sand
accumulation in lee of reefs
may be reduced together
with reef protection of the
shore.
2030: Occasional storm tide
flooding above highest
known tides. Flooding
frequency critical for
freshwater swamps.
(Lidar survey shows
extensive inundation of the
low ground behind Jones
Bay)
2070: Flooding will affect all
swamps and adjacent low
lying areas.
Frequent damage to
foredunes.
Impacts uncertain. Existing
terrestrial vegetation is
found in warmer conditions
elsewhere.
Dunes adapt well to drier
conditions, but recover more
slowly from fire, disease and
storm damage: dune
mobilization becomes more
likely.
Drains and creeks may
increase sediment and
nutrient load to coastal
swamps, (this depends on
land management practices).
The fall in fresh
groundwater pressure a
significant threat to
vegetation survival in
freshwater swamps.
Persistent swell wave climate
maintains sediment
movement towards the east
along the coast.
Active management of
dune blowouts.
Manage sill height on
tidal inlets to adjust to
higher marine storm
elevations.
Active management of
dune blowouts.
Active weed control
within dunes.
Maintain watching brief
on sedimentation of
high value swamps
areas.
Adaptive management
of plant assets.
Monitor beaches, see
above.
Maintain
connectivity of
vegetation within
the region.
Continue to
monitor salinity of
Piccaninnie Ponds.
Limestone Coast and Coorong Coastal Action Plan 200