Investigation of sediment accumulation in Nubia Lake, using RS/GIS

The main focus of this paper is to detect the changes in AHDL bed surface (sedimentation and erosion) in the period 2000-2012 in the active sedimentation zone of the Lake which is located in Nubia Lake (Sudanese part of AHDL). To enable this detection, the remote sensing (RS) and (Geographic Information Systems) GIS techniques are used to build the 3-D profile of the Lake portion where most of the sediment accumulate. Also, the accumulated sediment during this period is computed using the developed 3-D profile and using the cross section method as conducted by Aswan High Dam Authority (AHDA). Also, the surface areas of sedimentation and erosion are mapped and computed. Results indicated that sedimentation are dominant in years with high flood while erosion occurs when the incoming flow to the lake is low. Moreover, results indicate that the present approach overestimate the sedimentation amount by about 4% compared to the results of the method used by AHDA.