Variation Characteristics of Hourly Heavy Precipitation in Guangdong During 1961-2014
Based on the hourly precipitation data of 32 meteorological observational stations in Guangdong during 1961-2014, the climatic characteristics and variation of hourly heavy precipitation in annual, the pre and latter flood season in Guangdong were studied by using statistical diagnostic methods, such as linear regression analysis, MannKendall test, power spectrum analysis and the computation of trend coefficients. The results showed that the mean hourly heavy precipitation hours, intensity, precipitation and contribution in annual, the pre and latter flood season in Guangdong has a decreasing trend from coastal regions to inland. The change of annual torrential rain days and precipitation is not obvious in the same time. There are obvious differences among the annual hourly heavy precipitation hours and torrential rain days or precipitation. The hourly heavy precipitation hours at most stations in Guangdong has increased obviously, especially in Pearl River Delta. The changes of hourly heavy precipitation hours in annual or the preflood season in Guangdong have 3.7 and 22 year periods, and 3 year period in the latter flood season. The hourly heavy precipitation hours in annual and the latter flood season in Guangdong has an abrupt change in 1993-1994, but which is in the preflood has not an abrupt change.