Abstract:

It is important for studying the temporalspatial characteristics of precipitation in the Three Gorges Reservoir Area because of its special geographical position in China.In this paper,Inverse Distance Weighted,Spline,Ordinary Kriging and CoKrigings methods were respectively employed to interpolate the annual and monthly average precipitation of 46 weather stations in and around the Three Gorges Reservoir Area from 1961~2005.Then the results of the four interpolators were assessed under cross validation,and the temporalspatial distribution of precipitation was analyzed.The validating criterions indicated that the CoKriging which taken into account the elevation,performed better than the other three methods.However〖,based on the analysis of station error,we found that this method couldn't guarantee the error of all stations less than other methods.It showed that the precision of CoKriging interpolator would increase,when two weather stations at high elevation were eliminated.Through analyzing the temporalspatial distribution of precipitation in the Three Gorges Reservoir Area,the annual average precipitation is 1000~1200 mm in most area,and more than 45% of the annual precipitation concentrated in the summer.