Recognition and mapping of lacustrine relict coastal features using high resolution aerial photographs and LiDAR data

摘要: Shallow lakes in semiarid regions experience frequent water level fluctuations. Each long-lasting episode of water-level lowering leaves behind abandoned littoral forms and deposits whose identification mapping is hampered by their smooth relief. Given the difficulty recognising these possible relict using traditional geomorphological techniques, two sources information were employed present work: high resolution (1:15,000) aerial photographs a digital terrain model (DTM) generated from LiDAR data. The improved definition surface elevation enhanced quality as well accurate delineation subtle geoforms. method was applied to Gallocanta Lake, highly fluctuating shallow lake 14 km2 area less than 3 m deep located mountainous NE Spain. As result, sequence coastal features (RCF) with lateral continuity has been identified around lakebed. These include well-preserved spits recurved hooks, counter-spits, bays closed barrier islands, beach ridges, deltas cliffs. precise LiDAR-derived topographic maps suggest much greater extension lacustrine environment during Late Pleistocene, reaching at least 51 km2 about 13 m depth above bottom. presented this paper generates very detailed palaeogeographical that are particularly useful for reconstructing changes environments function climate change.