A Landsat TM and ETM+ survey of quaternary coastal landforms in the central coast of NSW, Australia Julia Yagüe & Pilar García Complutense University, Department of Regional Geographical Analysis and Physical Geography, Madrid, Spain;
[email protected] [email protected] Keywords: multitemporal RS, Landsat, remote seasonal vegetation detection, discriminating vegetal associations ABSTRACT: Landsat TM and ETM+ images are analysed to describe the vast array of quaternary landforms and sediments that occur in the Great Lakes district of the central coast of New South Wales (NSW), Eastern Australia, about 230 km north of Sydney. The study area falls between the lower Hunter river mouth to the south (Newcastle) and Cape Hawke Harbour in Wallis Lake to the north (Forster Tuncurry). Field campaigns preceded the remote sensing survey. The geological structure and the physiography of the area are controlled by folds which tend from due north to N40°W; the resistance of the carboniferous and Permian strata to erosion determines the coastal landforms of quaternary age. Several eolian, erosive and cumulative coastal landforms can be recognized within the bedrock embayments, which are the product of fluvial, paludal, lacustrine, estuarine and marine processes. Quaternary climatic oscillations have largely determined the geomorphic progression of the area in two distinct and parallel beach ridge systems. Landsat imagery helped to identify the dimensions of the following features: (i) Hard rock headlands and volcanic outcrops that conform the turning point of embayments. (ii) Flood plain deposits, including forms such as levees, back-swamps and filled-in channels. (iii) Estuaries and deltas. (iv) Eustatic terraces, although these are found further inland from the actual coastline.