平原区小流域降水量变化特征分析

利用平原区朱家河流域降水量实际观测资料,对流域内降水变化特征进行分析。阐明朱家河流域降水空间分布较均匀,降水量自东向西略有减小;降水量年际变化差异较大,最大年降水量接近最小年降水量的3倍;降水有明显的3～5a小周期变化;降水量丰、枯年份出现次数相当且次数多,占序列的81.8%;降水量年内分布极不均匀,主要集中在汛期6～9月;流域多年总体降水量并无增减,汛期降水量有减小趋势,非汛期降水量呈增长之势,年内降水差异逐步在缩小。

Analysis of the Change Characteristics of Precipitation in Small Basin on Plain

Basis on actual observation data of precipitation of Zhujiahe River basin on plain,the paper analyzed the change characteristics of precipitation in the basin.Clarify the precipitation space are uniformly distributed,precipitation from east to west slightly decreased;inter-annual precipitation are different,the maximum annual rainfall close to the minimum precipitation 3 times;precipitation have obvious 3 ～ 5 years small cycle;abundant and dry year of precipitation appear quite a number,accounting for 81.8% of the sequence;rainfall years is extremely uneven distribution,mainly concentrated in flood season（June～September）;precipitation have no increase or reduce,flood season rainfall have reduced trend,dry season precipitation have increased trend,difference of rainfall in a year gradually narrowing.