基于 DEM 提取流域水文信息的探讨与实践

摘要

简要介绍了利用数字高程模型（ DEM ）所表现的大量地表形态信息及进行水文分析工作的意义。同时结合实例，阐述了水文地理数据模型Arc Hydro的部分原理和算法，完成了研究范围内的河网提取及出水口的流域面积计算。%This paper introduces a lot of topography information using digital elevation mode ( DEM) of the perform-ance,the significance of hydrologic analysis work based on DEMS .It describes the principles and algorithms hydrological analysis module of Arc Hydro .Combined with examples ,Based on DEM ,we have Completed the extraction of rivers net-work in basin and completed the statistics work from the outlet of the study area .