Cell Descriptions - South East Natural Resources Management Board

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SE9 – Lake St George, Lake St Clair, Beachport 6.3.9 Cell SE9 Lake St Clair, Lake George, Beachport The area of the cell is 16515.8 ha. (49.7% water bodies); shoreline length is 33.12 km. Limestone Coast and Coorong Coastal Action Plan 346
SE9 – Lake St George, Lake St Clair, Beachport Landforms This is a large cell of approximately 16 km 2 and like SE10, it is an undulating coastal plain: aeolianite headlands and reefs; beaches and extensive dune systems; and a low inter-barrier plain largely occupied by the coastal lakes, St Clair and George. Lake George was re-opened to the sea by a drainage cut in 1934, followed by 500,000 m 3 of coastal sediments rapidly forming a massive inverse flood-tide delta, (Short & Hesp, 1984, p.91). For the 7 km south from Nora Creina wave energy is low to medium, due to protection by nearshore (1 km) reefs; beach sands retain finer materials in these conditions; varying even to the very finest fragile silica rods at the extreme low energy of the northern end of Stinky Beach. Beaches are low gradient, intermediate to reflexive; foredunes are highly variable in form; and behind the foredune only moderate sized transgressive dunes are seen. As wave energy increases to moderate towards the south of the cell, with reduction in offshore reef protection: sand grain sizes retained on the beach increase to medium to coarse, shore face slope angles increase, and volumes of sand in transgressive dunes increase. Near to Beachport calcarenite headlands and nearshore reefs increase in frequency. Transgression and sand storage are related to onshore transport factors during the Holocene to Recent. However, modern dune instability and movement are linked to the history of land use, and locally this has been documented by Armstrong, 1977, at 5-Mile and 10-Mile Drift, near Lake George, where the mid- 19th century coach road was cut in the 1890’s by sand drift, following grazing on the dunes. Inland from the dune barriers the lowland between the Robe Range and the Woakwine Range (the inter-barrier corridor) is occupied by the shallow lakes St Clair and Lake George, the latter could now be regarded as an estuary, though with limited land run off, through the Woakwine Drain, and a restricted marine connection. Lake George forms an important part of the drainage network controlled by the SE Water Conservation and Drainage Board; this lake receives fresh water from Drain M, and salt water through its tidal channel; it is variably brackish and poor flows have led to periods of eutrophication in recent years. Lake St Clair, which lies below sea level, is shallow and hyper saline: a hydrologically closed lake with salt levels raised by evaporation. Beachport, with Lake George in the distance. Photograph Coast Protection Board 2003. Limestone Coast and Coorong Coastal Action Plan 347
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Cell Descriptions 6 Cell descriptio
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SE1 - Piccaninnie Ponds 6.3 Descrip
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SE1 - Piccaninnie Ponds 221 bird sp
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SE2 - Port MacDonnell Landforms Thi
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SE3 - Cape Douglas 6.3.3 Cell SE3 C
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SE4 - Blackfellows Caves 6.3.4 Cell
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SE13 - Kingston SE Landforms This c
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SE15-17 - The Coorong Landforms Thi
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Cell Descriptions - South East Natural Resources Management Board

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