2/1/2024 0 Comments Meander beltsDepths for all soils are generally in excess of 2 metres. The cracking clays are acidic at the surface with light clays clearly changing to heavy clay subsoils that can be more acidic at depth and very few carbonate nodules. The texture contrast soils have slightly acidic sandy clay loam surfaces over grey light clays that increase in sodicity with depth. Major soils include sodic, grey texture contrast soils (grey Sodosols ) and cracking clay soils ( Vertosols ). There is a higher alkaline component (sodium and calcium) north of Quantong. Soils vary on the young unconsolidated regolith from sands, loams to clays where finer material has accumulated. Soil-landform units are relatively slender (generally less than 2 km across) and contain entirety of the Wimmera River and Yarriambiack Creek within its extent. Drainage across the plains varies from annabranching streams to meandering channels in form with slopes very gentle to gently inclined. There are some other meanders in the mid Wimmera tract, particularly where tributary streams such as Mt William Creek confluence. This floodplain is minor and intermittent amongst the calcareous dunes and plains ( 5.1 ) and the siliceous dunes and plains of the Big Desert ( 5.2 ). A channel with minor floodplain connects Lake Hindmarsh to Lake Albacutya. The floodplain terminates at Lake Hindmarsh where it is surrounded by predominantly calcareous plains and dunes. The floodplain is more obviously unconfined downstream of Glenorchy and diverted north-west adjacent to Grampians outwash material ( 4.3 ), then aligned east/west before sharply turning north and being confined within the Lowan Salt Valley and masked by the Little Desert ( 5.2 ) just south of Dimboola. The Wimmera River floodplain is the major unit with a number of effluent streams with confined floodplains such as Yarriambiack Creek and Dunnmunkle Creek.
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