基于DEM的流域坡度坡长因子计算方法研究初报

流域尺度的坡度坡长(LS)因子计算是区域土壤侵蚀评价的重要基础.基于坡面水文学和土壤侵蚀学,对流域坡度坡长因子计算的基本原理、方法和工作流程进行了讨论.以黄土丘陵区的安塞县县南沟流域为例,对LS因子进行了实例计算,并对计算结果进行了初步分析,同时提出了目前亟待研究的问题.

Method of Extracting LS Factor at Watershed Scale Based on DEM

Working out a small watershed planning on the Loess Plateau needs many kinds of geographical data. By taking the Majiagou watershed in Ansai County,Shannxi Province as a typical experimental area,taking the DEM of the watershed as the basic data set,and using ArcGIS and various space analysis technologies,data mining experiments on slope graduation,landform classification,and aspect graduation are conducted and a series of data mining parameters and the indexes for drawing up the planning are obtained. Based on the multi-dimensional geography spatial data sets,a new method of data superimposition and fusion that takes the value code as the core are proposed. The research result has a certain reference value in the planning instruction for other small watersheds on the Loess Plateau.