DEM流域特征提取及其在非点源污染模拟中的应用

Extracting Topographic Structure from DEM in GIS and Application of DEM to the Simulation of Non-Point Source Pollution

概述了数字高程模型(DEM)的特点及对其进行流域特征信息的提取原理和方法,结合流域非点源污染模拟研究的需要,在GIS软件和非点源污染模型SWAT的技术支持下,对密云县密云水库北部流域DEM进行了流域的刻划及模型运行单元HRUs的生成,最后从三个方面:对DEM在非点源污染研究中的应用进行了有益的探讨。

In this paper, the author generalizes the development of DEM （DEM） and the principle and method to extracting topographic structure. Based on the need of watershed non-point source pollution simulation research, and under the support of GIS software and the technology of non-point source model SWAT, the author delaminates the DEM of the north of the Miyun reservoir in Miyun county, and form the HRUs. Finally, the author set forth the utilization of DEM in the research of non-point source pollution at three aspects： threshold value in DEM delimitations to watershed hydrological analysis.