多尺度地表水动态模拟及应用

Application Research of Multi-scale Simulation of Surface Flow Dynamics

本文利用流水网模型分别基于多尺度地表模型建模和多尺度降雨源点模拟两种方式构建不同尺度的流水网模型,模拟从地表的任意降雨源点到河流出水口的水流路径,并通过曼宁公式计算任意时刻的流速和流量,从而实现多尺度地表水的动态模拟研究。通过与SWAT模型的对比试验表明,该模型的模拟精度有较大提高,Nash系数约提高了40%,相关系数和水量平衡系数也略有提高,较好地验证了该模型的可行性和有效性。

This paper conducts multi-scale simulation of the surface flow dynamics which is based on the multi-scale surface modelling and simulation of multi-scale source points using the Flow-Path Network （FPN） model. The model can build the flow paths from the any source point to the basin outlet and calculate the flow velocity and flow rate at any time by manning formula to realize the multi-scale simulation of the surface flow. A real-world catchment test demonstrated that simulation accuracy of the model have improved greatly compared to the result of the SWAT model. The Nash efficiency has increased by 40%, correlation relationship and balance efficiency also has improved slightly. It also has verified the feasible and validity.