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[1]WANG Cheng,CHEN Zheng-jiang,YANG Qing-ke,et al.Analysis on Uncertainty of DEM Derived Watershed Distributed Slope Length[J].Research of Soil and Water Conservation,2012,19(02):15-18.

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Analysis on Uncertainty of DEM Derived Watershed Distributed Slope Length

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 02 Page number: 15-18 Column: Public date: 2012-04-20

Title:: Analysis on Uncertainty of DEM Derived Watershed Distributed Slope Length

Author(s):: WANG Cheng, CHEN Zheng-jiang, YANG Qing-ke, CAO Jia-yun, CHOU Shu-ren; College of Resources and Environment, Northwest University, Xi’an 710069, China

Keywords:: slope length; uncertainty; watershed; boundary effect

CLC:: S157

DOI:: -

Abstract:: Topographic factors of slope length on soil conservation and soil erosion has an important influence,and the uncertainty also restricts the application of the watershed distribution of slope length,the research about the uncertainty of the watershed distributed slope length has important significance.Uncertainty of the watershed distributed slope length derived from flow algorithm,DEM resolution and data extent was analyzed in this paper using LS_Tool software.It showed that different flow algorithms lead to different results,and the slope length extracted by multiple flow direction algorithms is smoother,more continuous,and better represents the terrain structure;the slope length increases as the resolution becomes coarser and more smooth;the calculation of slope length should be buffered in some distance for watersheds (120m buffer in this test) or administrative boundary to avoid edge effects.

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