基于流溪河模型的连江流域洪水模拟

Flood Simulation of Lianjiang Watershed Based on Liuxihe Model

为了提高连江流域洪水预报的技术水平和精度,探讨流溪河模型在大流域洪水预报中应用的效果,该文采用SRTM和USGS的DEM数据,分别建立了连江流域洪水预报流溪河模型,采用1场实测洪水对模型参数进行了优选,并对2场实测洪水进行了模拟,发现流溪河模型可较好的模拟连江流域洪水过程。研究发现,采用空间分辨率为90 m的SRTM的DEM建立的流溪河模型计算量是以1 000 m的USGS的DEM建立的模型的计算量的56倍,但两者洪水模拟的效果相当。

To improve the flood forecasting accuracy and technical level,and to explore the possibility of employing Liuxihe Model for large watershed flood forecast,the Liuxihe Model is set up for flood forecasting of Lianjiang Watershed with the SRTM and USGS DEM. The model parameters are optimized by using one observed flood event,and two flood events are simulated by using the model with optimized parameters. The results show that the Liuxihe Model could simulate the flood events of Lianjiang Watershed satisfactorily. It is found that the computation time for running the model setting up with SRTM 90 m DEM is 56 times as that for running the model setting up with USGS 1000 m DEM,but the simulated results by both model have no significant differences.