降水的空间内插方法比较

Precipitation spatial interpolation is very importang to the hydrological modelling and forecasting.But there is not anyone optimizatial method in the many precipitation interpolation methods.This text taking Laoha river basin for example, this article uses daily rainfall data of 52 meteorological site in this study area,and extracts the annual rainfall from 1994 to 2005 as the raw data for analysis.It makes use of inverse distance weighted, ordinary Kriging, co-Kriging considering the elevation to make a spatial interpolation and analyse the spatial heterogeneity for the precipitation of drainage basin. The results show that co-Kriging considering the elevation in the three interpolation methods achieves higher accuracy; The spatial heterogeneity by precipitation of Laoha river basin is obvious for decreasing trend from the southwest to the northeast.The precipitation of drainage basin mainly concentrates in the south.