基于水蚀模型WEPP和GIS的高原小流域侵蚀模拟--以延安地区向阳沟小流域为例

根据延安地区向阳沟小流域的资料，利用水蚀模型WEPP结合GIS对该地区的水土侵蚀状况进行模拟。研究首先利用ArcGIS软件由数字高程模型DEM中提取诸如：流域的划分、水流网络等与流域特征相关的数据作为坡面资料；同时应用GIS矢量化向阳沟流域治理措施图作为土地管理资料；然后利用BPCDG程序整理气象资料。最后将上述成果整理后输入WEPP进行模拟。模型的模拟结果表明WEPP能够较为合理的模拟向阳沟小流域的水土侵蚀的发生，同时对应用不同的管理措施降低侵蚀量和径流量给出了定量评价。本研究表明GIS这种先进工具的介入可以很好地为WEPP这种机理模型提供数据，并且使得模拟结果的展示具体、直观、生动。

Simulation of water erosion by jointly application of WEPP and GIS--Taking Xiangyanggou catchment in Yan'an as an example

Based on the data of Xiangyangou catchment,this paper simulates the water erosion of this area with WEPP and GIS.First,with spatial analyst of ArcGIS,the hydrologic analysis is conducted based on the DEM(digital elevation model).ArcGIS collects the data about the characteristic of topography,such as flow direction and stream networks.Also by using ArcGIS,a paper map showing the management measures of Xiangyanggou is converted to a digital form, and fed WEPP as the management layer.Then the meteorologic data are processed by BPCDG,and the soil data are collected from historical survey data.Finally,simulations are performed by WEPP with the input data mentioned above.By comparing with monitoring data,the simulated amounts of soil loss and runoff of Xiangyanggou indictates that the simulation of WEPP is reasonable,and proves some management can reduce the severeness of erosion.Meanwhile,GIS can provide data to WEPP effectively, and illustrate better the results from the simulation model.