Coast & Estuaries
Page 229
If development on the coast was restricted, the natural recession of the coast
would have been allowed to occur, resulting in the coastline progressively
moving inland at southern beaches in accordance with natural northward littoral
drift of sand.
Figure 57: Change in the rate of sand movement along Lefevre Peninsula
Coastline in 1949 and 1999.
(Source: State of the Environment Report 2007).
The
Port Adelaide Enfield (City) Development Plan - August 2011
states that
development should avoid, as far as practicable, any adverse impacts on
marine, estuarine and coastal environment by way of:
•
Interference of natural Riverina ecology and processes;
•
Loss of habitats of conservation significance, such as those of threatened
or migratory species or marine ecosystems;
•
Contamination of ground or surface water, including marine, estuarine, or
Riverina;
•
Spread of pest plants and animals.
Sand Movement - beaches
The sandy beaches of Adelaide are highly modified environments that require
significant ongoing management to maintain. The manual management of sand
has occurred over the last 30 years.
The sand along the coast moves in a northerly direction, resulting in less sand
on the southern beaches and large amounts of sand along the northern
beaches such as Semaphore. It is estimated that between 40,000 and 70,000
cubic metres of sand are moved north each year along the eroding coastline
between Brighton and Semaphore.
North Haven, 1949
North Haven, 1999
