近50年滨州市汛期降水特征分析及年际年代际差异

利用滨州市1961～2010年逐日降水资料,采用第2、第3类距平以及小波分析等方法分析了汛期降水的基本特征及年际年代际差异。结果表明,滨州市降水季节变化呈单峰型,主峰在7月;不同时段有不同的降水集中期,年际、年代际变化明显;汛期降水呈减少趋势,汛期降水异常偏多年多发生在多雨时段,异常偏少年多发生在少雨时段;汛期降水稳定存在22～24年的长周期,不同时段还存在不同周期;暴雨开始的迟早、长短和暴雨降水集中期均有明显的年际、年代际变化;暴雨降水有稳定的23～25年的长周期和12～14年的中周期,不同时段还存在不同变化周期。

Analysis on Basic Characters of Precipitation in Flood Season and Annual,Inter-decadal Variation in Binzhou City in Recent 50 Years

By using daily precipitation data in Binzhou City during 1961-2010,adopting the second,third category departure and wavelet analysis method,the basic characters and annual,inter-decadal variation of precipitation in flood season was analyzed.As indicated by the results,seasonal variation of precipitation in Binzhou City assumes one apex,the main apex situates in July;different time have different precipitation concentrated period,the annual,inter-decadal variation is obvious;rainfall in flood season shows decreasing trend;there is a long-period of 22-24 a precipitation in flood season;the delay or early,long or short and rainstorm concentrated period all have significant annual,inter-decadal variation;rainstorm has stable long-period of 23-25 a and middle-period of 12-14 a.