基于ArcGIS的流域水文特征分析方法研究

Research on Watershed Hydrological Characteristic Analysis Method Based on ArcGIS

随着GIS技术的不断发展和DEM的广泛应用,基于DEM的流域水文特征分析研究受到越来越多的关注。目前,基于格网DEM的水流方向算法,会因为地形的局限,无法准确地进行模拟分流,水流方向也不符合实际流向。本文分析了几种基于DEM的水流方向算法,以格网点为中心建立3×3窗口的局部趋势面,计算出研究区内的曲率,分析区域内的水流聚合度和发散性随着曲率的变化情况,最后根据水流方向算法提取河网。

With the wide application of the improvement of GIS technology and DEM,DEM-based basin hydrologic characteristic analysis of receiving more and more attention. At present,in the flow direction algorithm based on grid DEM,algorithms for terrain limitations,cannot be accurately simulated shunting; the current direction does not correspond with the actual flow. This paper analyzes several flow direction algorithms based on DEM and dot for the Centre to establish local trends in 3 x3 windows,calculate curvature of the study area,analysis of flow aggregation in regional and divergent with the change of curvature.