基于HEC-HMS模型的四川省无资料地区设计洪水计算

The Design Flood of Ungauged Areas in Sichuan Province Based on HEC-HMS

针对分布式水文模型在无资料地区推求设计洪水时存在参数难以率定的问题,提出了采用现有四川省综合单位线成果的HMS分布式水文模型,并运用到琼江上游某工程断面设计洪水计算中。该方法的计算结果与推理公式法、综合单位线法计算成果相差不大,计算结果基本合理。实例应用结果表明,结合综合单位线法的HMS分布式水文模型的计算方法可以应用于四川无资料地区的设计洪水计算。由于分布式水文模型能够较好的反映流域的物理特征,因此该法的计算结果对于设计洪水成果的选取具有一定的参考价值。

Targeted at the problem of using distributed hydrologic model that needs to calibrate the parameters with real runoff and precipitation data,this paper proposes a method which combines the existing integrated unit hydrograph of Sichuan Province based on HMS distributed hydrologic model and uses this method to calculate the design flood of certain project cross section in the upper reach of Qiongjiang River.The result of this method has a little difference with the result calculated by rational formula and integrates unit hydrograph.So,the result of the method with HMS model is reasonable.The result of practice suggests that the HMS distributed hydrologic model method combines integrated unit hydrograph can calculate the design flood of ungauged areas in Sichuan Province.The result of HMS method has certain reference value on choosing design flood result,because the distributed hydrologic model can characterize well the physical structure of a basin to some extent.