Analysis of Characteristics of Extreme Precipitation and Occurrence Time of Small and Medium Sized Reservoir Under the"Rain Nest"Terrain in Guangdong Province
Analysis of Characteristics of Extreme Precipitation and Occurrence Time of Small and Medium Sized Reservoir Under the"Rain Nest"Terrain in Guangdong Province
Qingyuan-Fogang-Longmen which had occurred floods many times in history is one of the three heavy rain-storm centers in Guangdong Province.For providing scientific references for flood control and hazard mitigation,as well as water resource management of Daqin,Yinzhan,Liangdong and Huanglongdai reservoirs under this"Rain Nest"ter-rain,historical daily rainfall data from 93 stations in study area were used,and the characteristics of extreme precipitation and its occurrence time of four small and medium sized reservoir were investigated with the help of EEMD,circle statis-tics and R/S analysis method.The main results are as follows:The interannual variation periods of the extreme precipita-tion indices of four reservoirs is 3 a and 7 a.The extreme precipitation of four reservoirs mainly occurs during pre-rainy season,and its occurrence time will still be highly concentrated in the future.Liangdong Reservoir has the strongest pre-cipitation intensity and extreme precipitation,and the extreme precipitation of Daqin and Yinzhan Rerervoirs will increase in the future,which should be given special attention.The extreme precipitation of four reservoirs mainly occurs from winter to autumn and in spring and summer in Liangdong Reservoir should be focused on.
关键词
中小水库/极端降水/发生时间/EEMD/圆形统计/Hurst指数
Key words
small and medium sized reservoir/extreme precipitation/occurrence time/EEMD/circle statistics/Hurst indices
维普
万方数据