摘要
根据细河流域内雨量站1966—2015年的日降水量数据,采用趋势系数法和气候倾向率法计算细河流域近50a的不同等级降水量与降水强度的变化趋势,通过MannKendall突变检验法检验突变,利用反距离权重空间插值法研究了空间分布特征.结果表明:细河流域近50a年降水量呈逐年增加的变化趋势,增加速率为0.432mm/a;年降水强度呈逐年降低的变化趋势,降低速率为0.162(mm·d-1)/a.各等级降水中小雨降水量及小雨降水强度均呈减少趋势,且小雨降水强度减少趋势较为明显.2003年中雨降水量发生增加突变,1983年小雨降水强度发生了减小突变.在空间分布上,小雨和中雨降水量由东北向西南呈逐渐递减至逐渐增加的变化趋势,暴雨及大暴雨降水量由东南向西北呈逐渐递减至逐渐增加的变化趋势.
Based on the daily precipitation data of rainfall stations from 1966 to 2015years in the Xihe River Basin,the variation tendency of the different grades of precipitation and rainfall intensity of the Xihe River Basin in recent 50 years were analyzed by using the trend coefficient and climate tendency rate methods,mutation was tested by the Mann-Kendall method,the spatial distribution characteristics were studied by the inverse distance weighted interpolation method,the relationship between precipitation and rainfall intensity and rainfall days were explored by the Spearman correlation analysis method.The results showed that in recent 50 years the annual precipitation of the Xihe River Basin increased in 0.432 mm/a rate and its annual rainfall intensity decreased in 0.162（mm·d^（-1））/a rate.In different grades of precipitation,both the precipitation and rainfall intensity of the light rain were in a decreasing trend,and the decreasing trend of the rainfall intensity was obvious.The moderate rain precipitation occurred abrupt change in 2003 and the rainfall intensity of the light rain occurred abrupt change in 1983.In space distribution,the variation tendency of the light rain precipitation and the moderate rain precipitation were increased gradually after decreasing from northeast to southwest.The rainstorm and the heavy rainstorm were increased gradually after decreasing from southeast to northwest.
作者
朱正如
郭姗姗
ZHU Zhengru GUO Shanshan(College of Urban and Environmental, Liaoning Normal University, Dalian 116029, China)
出处
《辽宁师范大学学报（自然科学版）》
CAS
2017年第3期379-386,共8页
Journal of Liaoning Normal University:Natural Science Edition
基金
辽宁师范大学青年科研项目(LS2014L013)
关键词
不同等级
降水量
降水强度
变化特征
different grades
precipitation
rainfall intensity
change characteristics
