基于HSPF模型的平原河网地区流域划分

Watershed partitioning in plain river network area based on HSPF model

现有的流域划分方法适用于高差清晰的地区,在平原河网地区适用性较差。为解决平原河网地区流域划分问题,根据平原河网地区的地形地貌特征,提出了一种综合各数据优势的多尺度、分层次的平原河网地区流域划分方法。该方法参考水系、道路、圩堤、闸泵和土地利用类型,结合单元格级网格和网格中心点空间分析数据,生成流域划分参考图。通过建立常州市钟楼区平原河网HSPF水文模型,对提出的平原河网地区流域划分方法进行了模拟应用。结果表明:钟楼区2020~2021年水文过程模拟结果较好,德胜河桥、钟楼大桥和连江桥下站点的相关系数、纳什系数均大于0.75,满足模型模拟精度,提出的平原河网地区流域划分方法有一定的合理性和可行性。

Existing watershed partitioning methods are suitable for areas with clear elevation differences while are less applicable in plain river network areas.To solve the problem of watershed partitioning in the plain river network area,a multi-scale and hierarchical watershed partitioning method in the plain river network area was proposed.Referring to water systems,roads,dikes,gates and pumps,and land use types,and combining with cell-level grid and grid centroid spatial analysis data,we generated a reference map for watershed partitioning.The proposed method was applied to the plain river network in Zhonglou District,Changzhou City by establishing a HSPF hydrological model of this area.The results showed that the simulation results of hydrological processes in Zhonglou District from 2020 to 2021 were good,and the correlation coefficient and Nash coefficients of the stations at the Deshenghe Bridge,Zhonglou Bridge and Lianjiang Bridge were greater than 0.75,which satisfy the model simulation accuracy.The proposed method of watershed partitioning in plain river network is reasonable and feasible.