New data concerning the Late Quaternary drainage evolution on the Someş River alluvial fan

Abstract

The study area is located in the north-eastern part of the Pannonian Basin, on the romanian teritory, with a surface of over 3,600 square kilometers. With elevations of 20-30 m above the Timis and Cris plains, is the highest low-western romanian plains (100 – 160 m absolute altitudes), the surface extending on both sides of Somes River. This study aims to report new information on Late Quaternary evolution of fluvial discharge on the surface of Somes alluvial fan. Numerous relict fluvial morphologies were recognized on the surface ofSomesRiveralluvial Plain, by analyzing mainly the fluvial morphologies visible on the second austro-hungarian military maps (reference moment: ca. 1860), and on recent ortophotoplans (reference moment: 2005). The identified palaeochannel types (braided, meandering) and morphometry (large scale meanders vs. small scale meanders), the concentration of these relict features on distinct palaeodrainage directions, the relation of them with the recent fluvial drainage of the area (intersected, partly/ totally used by present day misfit channels), suggest a complex Late Quaternary history of the lower course ofSomesRiver.