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Integrated GIS Based Model for Estimation of Sediment Yield in Sungai Raya Catchment Area by Implementation of MUSLE

Abstract

Sediment yield estimation in catchment areas is considered as an important issue for catchment manager in order to enhance dam operation, reservoir capacity, water ways capacity, and flood protection. Sediment yield in an area has close relation with the amount of soil erosion which is occurring regarding to precipitation and runoff. Several empirical models with intergraded correlation to Geographic Information System (GIS) are widely used for soil erosion and sediment yield studies. Modified Universal Soil Loss Equation (MUSLE) is one of the most common models in sediment yield estimation, which is modified and originally driven from Universal Soil Loss Equation (USLE). In this study MUSLE model is used to estimate sediment yield in Sungai Raya catchment which was selected as study area. The key functions to develop the model are comprising as runoff volume (Q),runoff peak flow (qp) soil erodibility (K), Topography (LS), land use/cover (C) and support practices (P). Several source of data such as rainfall station diary, soil map; Digital Elevation Model (DEM) and spatial images have been considered for determination of model inputs. Finally, interaction of GIS and MUSLE model lead to generate the spatial distribution map of sediment yield in Sungai Raya catchment area.

Key words

MUSLE, GIS, Sediment yield, Sungai Raya Catchment

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