一种通过地形指数计算流域蓄水容量的方法

Calculating storage capacity with topographic index

在概念性分布式水文模型中,单元格蓄水容量的确定成为一个难题。考虑到单元格蓄水容量同地形指数之间的相似性,发现地形指数同蓄水容量间满足位移量为零的对数维布尔分布函数,建立了地形指数同单元格蓄水容量之间的函数关系,从而可通过单元格地形指数求取单元格的蓄水容量,在一定程度上解决了分布式水文模型中产流参数的离散化问题。

The study of the distributed hydrological model is a hotspot in recent years. Because some problems in the fully distributed hydrological model cannot be settled now, an alternative conceptual distributed hydrological model is put forward. An important problem in the conceptual distributed hydrological model is how to determine the storage capacity on every grid. Considering the similarity between the maximum of grid soil moisture deficiency and the grid topographic index, a logarithmic Weibull function relation existing between them is discovered. And then a method for calculating the grid storage capacity with the grid topographic index is put forward. The method is applied to the grid distributed hydrological model with incompaet structure. The results shown that, in the ungauged basin, we can get some hydrologic parameters from geographic parameters and find a new approach.