基于水文水动力耦合模型的山洪预报研究OA

Timely and accurate flood forecasting can effectively prevent floods and reduce the losses caused by flood disasters,and this paper aims at the problem that traditional hydrological models are difficult to refine the simulation of flood confluence processes in small watersheds in hilly areas.Based on the Shouxi River Basin,the difficulties of hydrological and hydrodynamic model coupling were analyzed,the connection conditions of the coupling model were analyzed,the solution process of the coupling model was introduced,and the hydrological and hydrodynamic coupling model was constructed on this basis,and the simulation results of the hydrological and hydrodynamic coupling model were analyzed in detail.The conclusions are as follows:the hydrological and hydrodynamic coupling model can significantly improve the accuracy of flood forecasting in hilly areas by simulating the flood confluence process in fine detail,especially for the flood confluence process.The absolute error of the peak of regular flood is 11.8m3/s higher than that of the traditional hydrological model.The relative error of flood peak was increased by 4.2％;The peak-present time error increased by 0.2 h,and the average NSE increased from 0.831 to 0.843.Compared with the traditional hydrological model,the absolute error of the flood peak during the validation period is increased by 8.0m3/s.The relative error of flood peak was increased by 2.0％;The peak-present time error increased by 0.2 h,and the average NSE increased from 0.848 to 0.870.The research results of this paper can provide technical support for the flood control safety of Shouxi River Basin.