EFFECT OF DEM ACCURACY ON WATERSHED EROSION

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Year:
2016
Type of Publication:
Proceedings
Keywords:
DEM ,Slope Length Factor, Steepness Factor, Vegetation Factor
Authors:
Li, Dong-Huang; Yang, Kai-Jie; Chen, Walter
Abstract:
Our recent study of surface erosion at Shihmen reservoir watershed in Taiwan indicated that the Slope Length Factor (L) and the Steepness Factor (S) might have greater influence on erosion than the previously thought Vegetation Factor (C). Since both L and S were calculated from Digital Elevation Models (DEMs), it was important to examine how the accuracy of a DEM could affect the L and S factors, which in turn could affect the erosion amount. In order to achieve this objective, we applied uniform random errors in the range of -20 m to +20 m to the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM) before calculating L, S, and surface soil erosion. Keeping all other factors constant, we repeated the process 30 times to achieve statistical significance. The results showed that the variation of erosion due to changing DEMs was between -15.01% and +2.19%.
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