The beach is more than a space for people to walk, sunbath and swim. It has a past and a future and this indicates that the sand dunes and the fragile dune vegetation are in need different forms of coastal protection and management. Hence the use of both sand-drift fencing to help restore and protect dune systems from erosion, by trapping wind-blown sand in the vicinity of the fence where natural vegetation is not sufficient to do so effectively, and various revegetation and restoration projects.
Beaches have a history and for Adelaide’s coastal beaches this history is one of coastal degradation.
Prior to European settlement, the beaches were naturally replenished from the dunes and the southern beaches, and therefore sand movement could continue almost indefinitely. Predominant wave energy hitting beaches from the southwest naturally shifted sand in a northerly direction along the coastline with most of the sand accumulating at Semaphore and North Haven. Development along our coast however, has resulted in large quantities of the sand supply either being ‘locked up’ (eg., ate the harbours at Glenelg and West Beach) or removed from the beach system, preventing natural replenishment. As a result, natural processes and coastal storms have continually eroded beach width, and without artificial replenishment, the sand will continue to erode away, exposing the underlying hard rocks and clays. Continue reading