流域水文模型中面雨量的空间插值

The Interpolation of Sub-basin-averaged Precipitation in Hydrological Models

以汉江褒河流域上游的江口地区为例,对流域水文模型中子流域面雨量的空间插值方法进行了比较,并应用三水源新安江模型对江口流域的日流量过程进行了模拟,模拟结果表明,在利用一般的面雨量处理方法,反距离加权法(IDW),克立格插值法(Kriging)及引入面积权重的泰森多边形面雨量处理方法等4种方法中,引入面积权重的泰森多边形面雨量处理方法取得了较其它三种方法更好的精度,在面雨量的处理上这种方法具有一定的优势。

In the studies of hydrological models analysis, precipitation whose spatial distribution information has great influence on the analysis results is one of the most important forcing data. Four interpolations including the traditional method, the inverse distance squared method,the Kriging method and the Thissen polygon method were discussed to calculate the sub-basin-averaged precipitation in hydrological models under the circumstances lacking observation stations and weak correlativity between meteorology (precipitation) and elevation. The sub-basin-averaged precipitation interpolation results of these four methods with the daily precipitation data from 1981 to 1985 over Jiangkou catchment of the Hanjiang basin were applied to the three-water-resource Xinganjiang model to simulate the daily discharge hydrographs of these five years. The analysis results show it has the best performance and the best applicability in sub-basin-averaged precipitation interpolation of the Thissen polygon method compared with the other three methods.