鲁西暴雨时空分布特征分析

Analysis on Time and Space Distribution Feature of Rainstorm in Luxi

利用1971—2010年聊城市所属县(市)气象站逐日降雨资料,分析了暴雨、大暴雨和局部暴雨的时空分布特征。聊城暴雨具有明显的季节性特性,其年代际分布特征呈波浪型起伏变化,暴雨站次数与年降水量变化趋势十分相似;聊城暴雨的分布特征为南北多、中间少,而大暴雨则呈由西南向东北增多的趋势。另外,局地性很强,全市性暴雨较少且主要发生在7、8月;以单日暴雨为主,连续性暴雨以2 d居多。

Using daily rainfall data of county （city） weather station in Liaocheng City from 1971 to 2010, the temporal and spatial distribution of rainstorm, heavy rain and local heavy rain were analyzed. The results showed that Liaocheng heavy rain had obviously seasonal characteristics, and its interdecadal distribution showed a wave-like ups and downs trend. The trend of number of rain stations was similar as annual precipita- tion. The distribution characteristics of Liaocheng heavy rain was more in the North and South, and the middle less, while the heavy rain was from southwest to northeast increased. In addition, it had strong local characteristics, and the city rainstorm was less occurred in July and August.it was more heavy rain day, and torrential rain in the majority with 2 days.