黑河径流时空演变规律分析

Analysis on variation characteristics on the runoff series of the Heihe River

以黑河的祁连站、莺落峡站和正义峡站为代表站，选取1945~2000年的月平均径流资料，采用Mann—Kendall趋势检验法和谱分析方法对黑河径流的趋势变化和周期变化进行分析，结果表明：近半个世纪以来，黑河流域的径流呈现出明显的减少趋势，并显示出2～3年和9年的周期变化规律。

The runoff trend and hydrologic period change of Heihe River was analyzed as selecting the monthly mean runoff in 1945~2000 by the Qilian station, Yingluo station, and Zhengyixia station using the Mann--Kendall statistical method and spectral analysis. The research result indicated that an obvious decrease trend has been detected since 1945, and the hydrology period was given with a cycle of 2~3 years and 9 years.