基于HEC-HMS水文模型的潼三段流域2021年秋汛洪水模拟

Simulation of 2021 Autumn Flood in Tongguan-Sanmenxia Watershed Based on HEC-HMS Hydrological Model

水库精细化调度是确保防洪安全与提高水库综合效益的主要措施。以三门峡库区潼关至三门峡大坝间流域(潼三段流域)无测控区为研究区域,基于土壤、土地利用、降水、径流等数据,构建HEC-HMS水文模型,对2021年潼三段流域整个秋汛洪水过程进行模拟,分析区间各支流洪水叠加过程与径流量变化。采用径流系数法(算术平均法和泰森多边形法)计算潼三段流域径流总量并与实测值对比,验证HEC-HMS水文模型模拟结果的准确性。结果表明:HEC-HMS水文模型在潼三段流域表现出良好的适用性与可靠性,径流总量模拟值与实测值仅相差2.33%,模拟效果显著优于径流系数法。

The optimal operation of reservoirs is the primary measure to ensure flood control safety and enhance the overall benefits of reser-voirs.Taking watershed between Tongguan and Sanmenxia Dam in Sanmenxia Reservoir area(Tong-San section watershed)as the research ar-ea without measurement and control,based on soil,land use,precipitation,runoff and other data,a HEC-HMS hydrological model was built to simulate the entire autumn flood process in the Tong-San section of the watershed in 2021,and analyze the flood superposition process and runoff changes of each tributary in the interval.The runoff coefficient method(including arithmetic mean method and Tyson polygon method)was utilized to compute the total runoff of the Tong-San section of the watershed,compared with measured values to validate the accuracy of HEC-HMS hydrological model simulation results.The results show that the HEC-HMS hydrological model has shown good applicability and reliability in the Tong-San section watershed,with a difference of only 2.33%between the simulated and measured total runoff values,and the simulation effect is significantly better than that of the runoff coefficient method.