基于GIS的天水罗玉沟流域土壤侵蚀强度评价

Evaluation of Soil Erosion Intensity in Luoyugou Watershed in Tianshui based on GIS

摘要: 以天水罗玉沟流域为评价区域,采用高分辨率遥感图像解译和野外调查相结合的方法提取土地利用信息,同时结合土壤类型信息计算出该流域的植被覆盖度.利用GIS技术对1∶1万地形图建立数字高程模型(DEM),进而提取地形坡度,经过数据综合分析,建立了土壤侵蚀强度评价模型.结果表明,该流域42.34%的区域属于强烈及强烈以上侵蚀区,土壤侵蚀严重.主要原因是该区域属浅切割区,质地较软,抗蚀力弱.

Abstract: Taking the Luoyugou watershed in Tianshui as an evaluation area,the information of land use was extracted by using interpretating high resolution remote sensing image as well as field investigation,then vegetation coverage was also calculated based on the information of soil type.GIS was used to build digital elevation model(DEM) for 1∶ 10000 topographic map,and the terrain slope was extracted.The evaluation model of soil erosion intensity was built through comprehensive analysis of the data obt..