河道防洪规划中水面线推算方法的应用

Application of Water Surface Profile Calculation Method in River Flood Control Planning

以盐城滨海港工业园区新滩片区为例,结合河道实测数据及水文气象资料,分别构建起MIKE11水动力模型和HEC-RAS模型,并以河道水位误差相对值和纳什效率系数等指标评价模型的模拟误差;模拟结果表明,MIKE11模型所得到的纳什效率系数略高于HEC-RAS模型,且河道水位误差相对值相对较小,为推荐模型;灵敏度分析结果显示,河道初始水位是影响河道防洪规划中水面线推算结果的主要水文参数,应予以重点分析。

Taking Xintan Area,Binhai Port Industrial Park,Yancheng as an example,the MIKE11 hydrodynamic model and HEC-RAS model are built respectively based on the measured river data and hydrometeorological data,and the simulation error of the model is evaluated by the relative value of river level error and Nash efficiency coefficient.The simulation results show that the Nash efficiency coefficient of MIKE1l model is slightly higher than that of HEC-RAS model,and the relative value of river water level error is relatively small,making it the recommended model.The results of sensitivity analysis show that the initial water level of the river is the main hydrological parameter affecting the calculation results of the water surface profile in flood control planning,which should be analyzed emphatically.