基于DEM数据的HEC-HMS和Vflo降雨特征模拟对比研究——以北京密云区为例

选用密云地区30 m和90 m DEM数据并运用ArcGIS软件提取该地区DEM数据的水文地理信息,通过分析水文模型HEC-HMS、EPASWMM和Vflo后选择应用HEC-HMS和Vflo模型对该地区降雨进行分析.同时,统计分析密云地区过去30年(1989—2018年)的降雨数据,并结合研究区水文情况,基于密云地区普通降雨、暴雨、大暴雨和特大暴雨的降雨数据选用HEC-HMS和Vflo软件进行水文模拟.结果表明,HEC-HMS和Vflo软件可有效地模拟密云地区的降雨情况.HEC-HMS和Vflo软件输出的仿真结果很好,仿真模型的确定系数均大于0.82.分析HEC-HMS软件输出的普通降雨、暴雨、大暴雨、特大暴雨的降雨强度及其它参数,发现降雨强度越小模拟结果越接近实际数值,基于Vflo水文模拟软件也有相同结果.这同时也说明在对暴雨、大暴雨和特大暴雨进行水文模拟时需要开发或优化相应软件来满足实际需求,最终为生态系统建设提供一定的研究基础.

Research on HEC-HMS and Vflo rainfall characteristics simulation and comparative based on DEM data: A case of Miyun District, Beijing

Miyun 30 m and 90 m DEM data area were selected. Hydrographic geographic information using ArcGis software DEM data is extracted. The hydrological models HEC-HMS, EPASWMM and Vflo were introduced and selected. The HEC-HMS and Vflo models were used to analyze rainfall. Miyun area rainfall data of in the past 30 years was statistically analyzed. The HEC-HMS and Vflo models were selected for hydrological simulation based on rainfall data from normal rainfall, heavy rain, heavy rain and heavy rain in the Miyun area. The results show that HEC-HMS and Vflo software can effectively simulate Miyun rainfall. The HEC-HMS and Vflo software output simulation results are very good. The simulation model determination coefficients are all greater than 0.82. The normal rainfall, heavy rain, heavy rain, heavy rainstorm intensity and other parameters output by HEC-HMS software were analyzed. The smaller the rainfall intensity, the closer the simulation results are to the actual values. The same results are also based on the Vflo hydrological simulation software. It also shows that it is necessary to develop or optimize the corresponding software to meet the actual needs. Finally, it will provide a certain research foundation for ecosystem construction.