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《Journal of North China Institute of Water Conservancy and Hydroelectric Power》 2010-02
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Analysis on Characteristics of Precipitation Variation over the Past 49 Years in Yinchuan City of China

QIAN Hui,LI Pei-yue,WU Jian-hua(School of Environmental Science and Engineering,Chang′an University,Xi′an 710054,China)  
According to the observational rainfall data collected from weather station including Yinchuan Station,Yongning Station,Helan Station and Lingwu Station in Yinchuan area,the characteristics of precipitation variation over the past 49 years from 1960 to 2008 in Yinchuan City were analyzed and studied with the methal of the theory of statistics,regression analysis,Mann-Kendall nonparametric test and Cringing interpolation as well as the calculation of correlative statistic.The study results show,that rainfall distributes disproportionationally in a year,precipitation is largest in summer,rainfall accounts for 56.83%~58.32% of total rainfall in a whole year,and rainfall in winter accounted for the least proportion which is 1.93%~2.07%.Rainfall changes a lot in different years and different decades,perennial average precipitation is 186.7 mm and rainfall in 1960s is largestm,while rainfall in 1990s is smallest.After tested by Mann-Kendall nonparametric and analyzed by monadic linear regression,a downtrend of precipitation is found,and Mann-Kendall nonparametric test trend coefficient β is-0.18 mm/a,regression analysis tendency rate is-5.386 mm/(10 a).Rainfall in Yinchuan city present disproportionational spatial distribution,rainfall in Lingwu is the largest and the downtrend is the smallest,while in Helan county,the rainfall is the smallest and the downtrend is the largest.
【Fund】: 教育部国家外国专家局“111”学科创新引智计划项目(B08039);; 全国地下水资源及其环境问题调查评价项目(水[2005]001-05);; 银川平原地下水资源合理配置及环境问题调查评价项目(200310400014)
【CateGory Index】: P426.614
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