1960-2013年新丰江水库流域持续性暴雨的气候变化趋势

选择和平、连平、新丰、龙门和坝址下游附近的河源气象站作为代表站,统计1960—2013年共54 a逐日降水资料得出：1期间共出现35个全流域性持续暴雨时段,35个持续性暴雨时段大部分集中在汛期（4~9月）内,其中23个在前汛期（4~6月）内,占65.7%;26月份是新丰江水库流域持续性暴雨时段个数最多的月份,占总个数的37.1%,其持续性暴雨时段的日最大雨量基本在130 mm以上;3最大日雨量与持续性暴雨时段内各站的平均累积雨量存在显著的相关关系（N=35,R=0.85,P=0.01）,平均累积雨量较大的持续性暴雨时段也主要集中在6月;4持续性暴雨的持续天数以2~3 d为主,最长为8 d。

Climatic Trends of Persistent Heavy Rain above Xinfeng River Reservoir Basin from 1960 to 2013

Based on the daily precipitation data from 5 meteorological stations, 33 persistent heavy rain events in Xinfeng river reservoir from 1960 to 2013 have been studied. The results indicate that the persistent heavy rain occurred mainly in the flood season （ April to September） , 65.7% occurred in the first flood season （April to June）, 37. 1% occurred in June. There is a significant correlation between the average cumulative rainfall of persistent heavy rain period and maximum daily rainfall. The persistent heavy rain lasted for 2 -3 days predominates all the events, but the longest one was up to 8 days.