泾慧渠灌区近70年降雨演变规律分析

Analysis of rainfall evolution of Jinghui canal irrigation district in recent 70 years

以泾慧渠灌区为研究对象,基于张家山水文站近70年(1941-2013)降雨资料,运用差积曲线法、Mann-Kendall和滑动T检验法等,分析了该地区降雨特征及演变规律。结果表明:该灌区在1945-1984年处于丰水期,1984-2013年为枯水期,多年平均降雨呈不显著下降趋势,并在1986年发生突变现象。

Jinghui canal irrigation district was taken as the research object.Based on the 70 years （1941- 2013a） rainfall data of Zhangjiashan hydrological station,and the use of model ratio difference product curve method, linear trend estimation and moving average trend analysis, non parameter test method of Mann Kendall rank correlation test and sliding T test,the characteristics and evolution of rainfall of the region was analyzed. Results are shown as follows：the area was in wet season in 1945-1984 on the whole,while in 1958- 1963,1965-1970 it showed a flat trend,and in dry season in 1984-2013;the annual average rainfall of Jinghui canal irrigation showed a downward trend which was not significant,and the mutability occurred in 1986.