咸阳近50年暴雨气候特征分析

目的]分析咸阳近50年暴雨的气候特征。方法]采用咸阳市1960～2009年11个气象站降水观测资料,分析咸阳暴雨的气候分布特点。结果]咸阳各县(市、区)暴雨年发生频次均不足1次,其中,西南部的武功暴雨日数居全市之冠,秦都站则最少;暴雨年际变化差异较大,呈少-多-少-多的趋势;暴雨出现在4～10月,其中,7～8月最多,大暴雨出现在5～9月;暴雨多历时短、强度大,以夜间型居多;咸阳暴雨以局地性最多,占总数的77%;暴雨多为单日出现,连续发生暴雨的几率很低。结论]该研究为做好此类天气预报及趋利避害、防灾减灾奠定了基础。

Analysis on Climatic Characteristics of the Rainstorm in Xianyang in Recent 50 Years

Objective] The research aimed to analyze climatic characteristics of the rainstorm in Xianyang in recent 50 years.Method] By using precipitation observation data at 11 meteorological stations in Xianyang from 1960 to 2009,climatic characteristics of the rainstorm in Xianyang were analyzed.Result] Annual occurrence frequencies of the rainstorms in each county(city and district) of Xianyang were all less than 1.Rainstorm days was the most in Wugong and was the least in Qindu station.Interannual variation of the rainstorm was big,and presented less-more-less-more tendency.Rainstorm appeared from April to October,and was the most during July-August.Heavy rainstorm appeared from May to September.Rainstorm had short duration and big intensity,with nocturnal majority.Regional rainstorm in Xianyang occupied 77% and was the most.Rainstorm mainly occurred in one day,and occurrence probability of the continuous rainstorm was very low.Conclusion] The research laid foundations for doing this kind of weather forecast well,going after advantages and avoiding disadvantages,preventing and reducing natural disasters.