数字流域水系构建方法浅析

Preliminary Analysis on the Method of Building Digital Basin

基于辽河水系老哈河流域栅格DEM数据,分别采用数字高程流域水系模型(DEDNM)、河流工具RiverTools、地理信息系统Arcview软件,根据地形提取水系信息,构建数字流域,并分析比较了三者在凹陷区域识别、水系、子流域及其拓扑关系生成方面的差异。总的来说,数字高程流域水系模型的可修改性较好;而RiverTools软件可视化程度高,使用方便,并具备强大的图示和地形分析功能;Arcview基于地理信息系统(GIS)更易于进行二次开发。

On the basis of raster DEM data in the Laohahe River Basin,a comparison is made in the aspects of identification and treatment of depression area,generation of drainage network,sub -catchments and topological relationship amongst three methods of building digital basin with the extracting drainage network,viz.Digital Elevation Drainage Network Model(DEDNM),River network analysis Tools(RiverTools)and geographic information system software(Arcview).As a result,DEDNM has the advantage of better modification,while RiverTools performs better on convenience,strong practicality,and visualization in drawing and topographical analysis.And Arcview would be a better choice for the second or further development.