Cell Descriptions - South East Natural Resources Management Board
Cell Descriptions - South East Natural Resources Management Board
Cell Descriptions - South East Natural Resources Management Board
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SE2 – Port MacDonnell<br />
Climate change<br />
element/ scenario<br />
Storms:<br />
Frequency continues<br />
to show great<br />
variation on a<br />
decadal scale.<br />
Intensity of large<br />
storms increases.<br />
Warmer average<br />
conditions:<br />
2030:+0.3 to.6 0 C<br />
2070:+1.5 to 2 0 C<br />
Drier average<br />
conditions:<br />
2030: -2% to 5%<br />
2070: - 10% to 20%<br />
‘Flashy’ run off:<br />
Drier creeks, but<br />
larger rare floods<br />
Groundwater<br />
lowering; saline<br />
incursion:<br />
Impacts and implications Protect and manage Address landscape<br />
(for this cell) habitat threats issues: fire,<br />
connectivity,<br />
refuges, hydrology<br />
Swamp.<br />
Wetland, Eight Mile<br />
Creek and Stratman<br />
Pond.<br />
Increase in storm foredune<br />
damage and beach recession<br />
in embayments.<br />
Sandy coast has marked<br />
recession, (low sand storage<br />
volume), foredune blowouts,<br />
and dune transgression.<br />
Beach and nearshore sand<br />
accumulation in lee of reefs<br />
may be reduced together<br />
with reef protection of the<br />
shore.<br />
2030: Occasional storm tide<br />
flooding above highest<br />
known tides. Flooding<br />
frequency critical for<br />
freshwater swamps,(see<br />
above).<br />
2070: Flooding will affect all<br />
swamps and adjacent low<br />
lying areas.<br />
Frequent damage to<br />
foredunes.<br />
(Impacts uncertain. Existing<br />
terrestrial vegetation is<br />
found in warmer conditions<br />
elsewhere).<br />
Dune vegetation adapts well<br />
to drier conditions, but<br />
recover more slowly from<br />
fire, disease and storm<br />
damage: dune mobilization<br />
becomes more likely.<br />
Drains and creeks may<br />
increase sediment and<br />
nutrient load to coastal<br />
swamps (this depends on<br />
land management practices).<br />
The potential fall in<br />
groundwater pressure a<br />
significant threat to<br />
vegetation survival in<br />
freshwater swamps.<br />
Continue and if<br />
necessary extend beach<br />
profile monitoring, as<br />
baseline information for<br />
coastal change.<br />
Active management of<br />
dune blowouts.<br />
Manage sill height on<br />
tidal inlets to adjust to<br />
higher marine storm<br />
elevations (see above).<br />
Active management of<br />
dune blowouts.<br />
Active weed control<br />
within dunes.<br />
Maintain watching brief<br />
on sedimentation of<br />
high value swamps<br />
areas.<br />
Adaptive management<br />
of plant assets.<br />
Maintain<br />
connectivity of<br />
vegetation within<br />
the region.<br />
Monitor salinity of<br />
coastal swamps.<br />
Limestone Coast and Coorong Coastal Action Plan 223