流域计算单元对新安江模型参数的影响研究

新安江模型广泛应用于湿润半湿润地区，参数影响着新安江模型的模拟效果。其参数的取值也受到很多因素的影响，其中包括研究流域的划分方式对新安江模型参数的影响。本文所研究的流域为沿渡河流域，对沿渡河流域分别采取三种划分方式，对于每种划分方式下，划分得到的每个流域计算单元面积基本相等。分别对三种划分方式下的每场洪水模拟调参，最终得出与之对应的三组最优平均参数，对比分析这三组最优平均参数值的变化。从模型参数的物理意义上分析，并经上述实例的模拟和优化，得到的结论是，同一流域，计算单元划分的个数越多，其面积越小，新安江模型参数CS，CI，CG也越小。

英文摘要:

Xinanjiang model is is widely used in humid regions and sub humid regions .The parameter of Xinanjiang model has a great influence on its simulation results. What’s more, there are many factors that affect the parameter of Xinanjiang model. Among them, whatever in different or in the same basins, the area of small watershed has certain effect with the parameter of Xinanjiang model. In this paper, the research is based on Yandu River, in which Yandu River basin is respectively divided into different small watershed. There are three different ways of divisions to make the number and the areas of units changed, and in each division the area of the units were similar. Respectively for three kinds of units division under the way of the field to simulate the flood adjustable parameter, finally got three groups of optimal parameters on average. Analysis of the three group of optimal parameters change, the size of the average can be concluded that the more the number of cell division, cell size is smaller, the Xinanjiang model parameters of CS, CI, CG.

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