Abstract：The flood of small watershed in the hilly area has the characteristics of seasonality,suddenness and concentration of water,which results in great damage to people downstream. Considering that the flood forecasting accuracy of small watershed is poor,it is necessary to research the flood forecasting of small watershed to provide support for flood prevention decision. In this paper,the runoff curve method was applied to calculate the net rain first. Then the surface runoff was simulated by the method of two-dimensional hydrodynamic model in order to obtain the flow process of the outlet section of the basin. Finally,above methods were used in the Chiqiao small watershed of Fuzhou. The results show that the deterministic coefficients of ten floods selected can basically reach Grade B. The peak time errors are all controlled within two hours,and the relative errors of flood peak can be controlled within 20 percent,which can meet the accuracy requirements of flood forecasting. It has been verified that the runoff curve method that comprehensively considers the underlying surface conditions such as land use and soil type can simulate the runoff process well. And the two-dimensional hydrodynamic model can simulate the surface runoff evolution process well in the small watershed. Overall,these methods can provide a new idea for flood forecasting in small watersheds.
王艳艳, 林昌勇, 吴西贵, 陈伟娜. 基于水动力模型的小流域洪水预报研究[J]. 中国防汛抗旱, 2020, 30(12): 78-82.
WANG Yanyan, LIN Changyong, WU Xigui, CHEN Weina. Research on flood forecasting of small watershed based on hydrodynamic model. journal1, 2020, 30(12): 78-82.
2020, Vol. 30 
