Theme 8-6-Soil erosion and sediment yield modeling using GIS.

Abstract

A Geographical Information System (GIS) based method is discussed and demonstrated for prediction of storm sediment yield from catchments. In the method discussed herein the catchments are discretized into hydrologically homogeneous grid areas for capturing the heterogeneity present in them. The gross soil erosion in each grid of the catchment is calculated using the universal soil loss equation (USLE). The concept of sediment delivery ratio is used for determination of the total sediment yield of the catchment during an isolated storm event. Temporal variation of the sediment yield during the storm event is also calculated.