The Study of Temporal Downscaling method of Short-period PrecipitationBased on Statistical Analysis

Because of the scarcity of the observed precipitation in hydrological forecast especially for regions without data,remote sensing plays important role in providing precipitation data.However,as the time scale of the precipitation data provided by remote sensing is always very long,it is difficult to meet the demand of hydrological forecast.This paper proposed a precipitation downscaling method in time scale based on the statistical analysis of the independent precipitation event and applied it at the Qilin gauge in Shiguan River to downscale the precipitation of 6 hours,3 hours,2 hours and 1 hour into 10 min.The application results indicate that this method is simple and practical and it can insure that there is not only a consistency between observed and simulated precipitation data,but also between the rainfall intensities.