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《Geomatics World》 2009-01
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Application of DEMs in Regional Soil Erosion Modeling

YANG Qin-ke1,2,ZHAO Mu-dan1,LIU Yong-mei1,WANG Lei1,LI Rui2(1.Northwest University,Xi'an 710069,China;2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,China)  
Terrain is a primary factor to affect the hydrological and erosion processes.Slope gradient and length,etc,are key parameters of soil erosion prediction models and watershed hydrological models.Researches on the application of DEMs and digital terrain analysis in re-gional soil erosion modeling include:how to make a representation of terrain shape and gullies structures and enhance to generate hydrologically correct DEM;which parameters or variables to be used to describe the influences of terrain on soil erosion processes at the multiple scales;how to extract the ero-terrain factors based on digital terrain analysis,GIS spatial analysis,and digital image processing strategies;and how to make a algorithms for relationship between ter-rain variables and soil erosion.By introducing advanced views of terrain representation and in-terpolation algorithm from western and improving the DEMs based on higher accuracy hypsog-raphy data and digital topography maps,taking scaling issues into account and integrating the existed researches on erosion terrain factors and regional soil erosion model,are key issues in this study field in the future.
【Fund】: 国家重点基础研究发展计划项目资助(973计划)(2007CB407203);; 水利部公益性行业科研专项项目资助(200701035-1)
【CateGory Index】: S157
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