中文摘要：

提出了基于泰森多边形法法估算流溪河模型单元网格面雨量的方法,针对田头水流域建立了流溪河模型,采用PSO算法优选了模型参数,模拟了六场实测洪水过程,取得了较好的模拟效果,说明泰森多边形法适用于流溪河模型洪水预报降雨估算的需要。分析了站网密度对面雨量估算、流溪河模型参数优选及洪水模拟的影响,发现存在临界雨量站网密度。雨量站网密度达到临界值后,利用流溪河模型模拟洪水的变化不大。

英文摘要：

This paper has proposed the precipitation interpolation method for estimating the cell area precipitation of Liuxihe Model,and set up the Liuxihe Model for Tiantoushui Watershed,optimized the model parameter with PSO algorithm,simulated six flood events.The results show that the Theissen pdygon method works well for Liuxihe Model.A study is made of the impact of rain gauges network density on precipitation estimation,parameter optimization and flood simulation of Liuxihe Model,and find that there exists a threshold rain gauge network density.When the rain gauge network density is higher than the threshold,the flood simulation results changes little.