小流域次洪模拟的多尺度研究

Multi-scale study of flood simulation in small watershed

选取山丘区小流域,采用HEC-HMS水文模型,基于ArcGIS软件划分区域模块,采取初损稳渗法、Clark单位线法和马斯京根法模拟DEM分辨率分别为30,60,90m多种空间尺度下的次降雨洪水过程。结果表明DEM分辨率大小对次洪过程有一定的影响,运用分辨率较低的90m DEM比30m和60m DEM模拟洪水合格率高9.1%和18.18%,而且对于洪峰流量较大类型的洪水90m DEM模拟效果最佳,其次是30m DEM。

Selects a small watershed in the hilly area,uses the HEC-HMS hydrological model,and divides the regional modules based on ArcGIS software.The hydrological calculation method adopts initial and constant method Clark unit line method Muskingen method.The curve method simulates the sub-rainfall and flood process at various spatial scales with DEM resolutions of 30,60 and 90 m.The results show that the resolution of DEM has a certain impact on the secondary flood process.The lower resolution 90m DEM is 9.1%and 18.18%higher than that of 30m and 60m DEM.Moreover,the 90m DEM simulation effect is the best for floods with large peak flow,followed by 30m.