平原河网的水量计算和参数率定—改进的湄公河模型

The Flooding Plain Network Model-The Improved Mekong River Model

本文根据平原河网地区河道纵横交错、水流错综复杂的特点,为克服湄公(Mekong)河模型在求解大型复杂河网水力特性时参数率定的繁琐,对湄公河模型参数率定部分进行了改进。即将原模型中连接河道的流量系数为参数,改为现模型中连接河道的糙率为参数,并用最优化方法中的复合形法优化糙率参数,建立了改进的湄公河模型。

In this paper, the 'Improved Mekong River Model' is presented. It uses roughness instead of discharge coefficient as its parameter. Roughness is calibrated by optimization method. The improved model is more suitable for evaluating hydraulic parameter of complex network of waterway of large scale. Comparing with the original, it has the advantages of saving computing time and being easy to operate. As an example, it is applied to the network of waterway in Zhenjiang region, a good result is achieved.