Abstract:

Based on 1959～2008 daily precipitation data over 17 stations of Hubei Province,applying the Kriging interpolation method，linear trend,the cumulative anomaly,moving average and the MannKendall,complex Morlet wavelet analysis method the characteristics of the temporal and spatial distribution of torrential rains in Hubei Province were analyzed.The results indicate:Hubei Province's storm show a multicenter distribution，there are two storm highfrequency center，which one is in the southeast and the other is in northeast Hubei;one lowfrequency center in the northwest Hubei；on the overall it shows a decline from the southeast to the northwest of the geographical distribution；highfrequency heavy rainfall areas,stormprone areas and maximum rainfall areas appeared in eastern Hubei.On time evolution of trends,Hubei storm days showed weak growth trend in the past 50 years,and experienced below normalbelow normalabove normalabove normalbelow normal during the interdecadal variation of rainfall amount;the frequency of partial years of heavy rain days is higher than the partial juvenile in abnormal rainstorm；torrential rain days and heavy rainfall across the province the amount of mutation occurred in 1978,and there is 9 years and 5 years of periodic oscillations,and district torrential rain days have shown significant decadal cycle of 8~10 years features.