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《Research of Soil and Water Conservation》 2017-04
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Study on Topographic Features of the Terraces DEM

FENG Yuan;ZHAO Mudan;ZHANG Peng;WU Yuxin;College of Urban and Environmental Science,Northwest University;  
As the special and artificial micro topography,terraces have already become land resources with economic and ecological benefits in the Loess Plateau.However,most existing DEMs hardly satisfy the realization of terrace terrain,and partial artificial landform information is lost.In this paper,we choose terraces in a basin in Ansai County as the case study area,the materials include DEM of Ansai(its scale is 1∶10 000,resolution is 5 m)and a remotely sensed image with a resolution of 2.5 m.Based on the improved rapid modeling method for terrace digital elevation model,we adopt the actual ridge-based method to construct the DEM with terraces information(T-DEM)by integrating with high resolution remote sensing image.Using Spatial Analyst Module of ArcGIS and LS-TOOL,topographic features and terrain factors(slope,slope length and LS factor)were extracted from Original DEM and T-DEM,respectively.The results show that:(1)T-DEM reflects terrace terrain accurately and intuitively;(2)in comparison with the Original DEM in sample region,profile features of elevation extracted by T-DEM distribute like a ladder were more consistent with the real topographic features;meanwhile,slope,slope length and LS factor extracted by T-DEM are smaller;more precisely,the average of slope decreased by almost a half and its range increased;the range of slope length reduced obviously and the average of slope decreased;LS is reduced by 90%.In conclusion,terraces play an important role in DEM-based terrain analysis.This research has the significant meaning for evaluating soil erosion.
【Fund】: 国家自然科学基金“梯田对坡度坡长因子的扰动特征研究”(41271284)
【CateGory Index】: S157.1
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