Analysis of spatio temporal characteristics of hourly heavy precipitation in different grades in Guangdong
Hourly heavy precipitation (HHP) event is defined as the amount of rainfall larger than or equal to 20 mm per hour.Due to the heavy intensity and the fast accumulation of rainfall,HHP often brings a lot of problems such as urban inland inundation and traffic jam,along with disasters in mountainous regions such as landslip,torrential flood and debris flow.Based on the hourly precipitation data from Guangdong Automatic Weather Stations (AWS) and National Weather Stations,the variations of HHP during the flood season are analyzed.Results indicates that,HHP happens most frequently in three rainy areas of Guangdong.HHP activity reaches high occurrence in May,followed by June and August.The diurnal variation of HHP in August has double-peak distribution while those in other months of flood season show single-peak distribution.HHP maxima appears between 13:00 ～ 19:00 and most at 16:00.HHP most occurs at southern side of Yunwu Mountain in Western Guangdong,southern side of Lianhua Mountain in Eastern Guangdong,south of Qingyuan and Pearl River Estuary,which basically follows the orientations of the mountains.
hourly heavy precipitationfrequencyspatiotemporal characteristicsgeological hazardstrumpetshaped topography
NETL
NSTL
万方数据
维普
