城市雨水流域汇水区自动划分

Automatic partition of urban rainwater catchments basin

针对传统汇水区划分方法中存在的问题,利用流域地形分割技术,通过专业的GIS地形处理软件,建立了城市雨水流域汇水区的自动划分方法,其划分过程主要由构建格网DEM、格网点流向定义、汇流网络提取、子汇流区域划分、子汇流区域生成城市流域汇水区和流域汇水区编码6步组成。实验证明,雨水流域汇水区的自动划分方法不仅操作性较强,而且大大提高了汇水区划分的效率和质量。

In view of the existing problem in the traditional method of the compartmentalization of urban rainwater catchments basin, by the technology of partition of drainage basin and professional GIS terrain disposal software, the paper proposes a method of automatically compartmentalizing the urban rainwater catchments basin by six steps： construct the grid DEM, define the stream direction of grid nod, extract the catchments network, compartmentalize the sub-catchments, build urban rainwater catchments basin with sub-catchments, encode the rainwater catchments basin. Finally, this paper proves that the method of automatic compartmentalization of rainwater catchments basin is easily operable and highly improves the efficiency and quality of the compartmentalization of rainwater catchments by instance.