GIS环境下基于DEM的三川河流域特征提取

以地理信息系统软件Arcgis10.0为平台，探讨了其水文分析模块在流域划分、地形分析、河网提取上所采用的算法和原理。并以三川河流域为例，基于数字高程模型（DEM）数据，详述了提取流域特征的方法和步骤，实现了流域边界、坡度、坡向、表面曲率及流域河网的自动提取。结果表明：上述成果均能较好的吻合流域的实际情况，该方法具有操作简单、灵活方便、成果精度高、提取速度快等特点。流域特征的自动提取为进一步研究水土保持、水文模型、流域规划及数字流域等提供了基础数据，具有重要的实际意义。

Extraction of Characteristics of Sanchuan River Basin Based on DEM in GIS Environment

Taking the Arcgis10.0 of GIS software as a platform,the algorithm and principle of hydrological analysis module which includes watershed division, terrain analysis, river network extraction, are discussed.Taking Sanchuan River Basin for an example, based on the digital elevation model (DEM) data, methods and steps of automated extraction of basin characteristics are detailly introduced,basin characteristics such as basin boundary,slope,aspect,surface curvature and river network are automatically extracted.The results show that above results are fit for the actual situation of river basin,this method has several characteristics which are simple operation, flexibility and convenience,high precision,high extraction speed and so on.Automated extraction of basin characteristics affords basal data for the further research of soil-water conservation, hydrological model,basin planning and digital basin.Thus it has an important actual significance.