基于DEM的水文信息提取研究——以池州市为例

A Study of Hydrological Information Extraction Based on DEM——A Case Study of Chizhou

水文信息的提取对建立数字流域、水文分析、构建分布式水文模型有着重要的意义。以池州市为例,采用ASTER GDEM为数据源,探讨如何利用ArcGIS软件的水文分析模块Hydrology进行水文信息的提取,包括洼地填充、水流方向计算、水流累积量计算、河网提取等。利用GoogleMap的水体数据对提取结果进行验证,结果表明:基于DEM提取的河网与实际基本吻合,运用此方法能够快速、高效、准确的获取研究区域水文信息,能为池州市环境数据库的构建以及河流整治、城市规划、环保等工作的决策提供一定的参照和依据。

Hydrological information extraction plays a most important role in establishing digital watershed,hydrological analysis, and construction of the distributive hydrological model. With the case of Chizhou, and the data resources of ASTER GDEM, the paper explores how to use the hydrological analysis model of Arc GIS to extract Hydrological information, including depression padding, water direction calculation, water cumulant calculation, extraction of hydrographic net and so on, and use Google Map to verify the extraction results. The result shows the extraction of hydrological net based on DEM confirms to the real situations, which can provides basis for making policy of establishing water environment data, river improvement,urban planning, and environment in Chizhou.