Cell Descriptions - South East Natural Resources Management Board

SE6 – Lake Bonney SE
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
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:
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 storm foredune
damage and beach
recession. The partially
buried calcarenite
topography could well lead
to an indented coastline, of
reefs and embayments.
Foredune damage leads to
dune de-stabilisation, and
transport of sand across the
barrier.
2030: Occasional storm tide
flooding above highest
known tides.
2070: Flooding will affect
all swamps and adjacent
low lying areas.
Frequent storm damage to
foredunes.
(Impacts uncertain.
Existing terrestrial
vegetation is found in
warmer conditions
elsewhere)
Dune vegetation adapts
well to drier conditions, but
recovers more slowly from
fire, disease and storm
damage: dune mobilization
becomes more likely.
Drains and creeks may
increase sediment load to
coastal swamps and lakes
(this depends on land
management practices).
Aridity and sea level rise a
threat to perched
freshwater table within the
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
shoreline change.
Active management of
dune blowouts.
Manage sill height on tidal
inlet to adjust to higher
marine storm elevations
as part of the adaptive
management of Lake
Bonney.
Active management of
dune blowouts.
Active weed control
within dunes.
Maintain watching brief
on sedimentation of Lake
Bonney.
Monitor salinity in small
freshwater lakes. Adaptive
management of plant
Maintain
connectivity of
vegetation within
the region.
Limestone Coast and Coorong Coastal Action Plan 299