Study on the characteristics of runoff variation in the south slope of Qilian Mountains River from 1956 to 2016
Based on the runoff data of 4 hydrological stations(zhamashike,Qilian,garide and qingshizui)in south slope of Qilian Mountains from 1956 to 2016,using linear trend and Mann-kendall test,the characteristics of seasonal,annual mean and Mann-Kendall abrupt changes of runoff at four hydrological stations on the south slope of Qilian Mountains were studied.The results showed that:(1)the runoff of zhamashike,Qilian,garide and qingshizui hydrologic stations increased year by year,and the trend rates were 33.7 million m3·(10a)-1,18 million m3·(10a)-1,10.3 million m3·(10a)-1,29.5 million m3·(10a)-1,respectively;the annual average runoff of the Qingshizui hydrologic station was 1639 million m3,and that of the Qilian hydrologic station was 457 million m3.(2)The runoff of 61A in the other 3 hydrological stations changed suddenly except in the case of Garide.According to the change characteristics of seasons(in summer),the trend of reduction of Zhamashike and Qingshizui hydrologic stations was slightly decreased in spring since 61a,and the reduction trend rates were 0.005·(10a)-1 and 0.007·(10a)-1 respectively;the trend of increase of Qilian hydrologic station was slightly increasing,the trend of increase was 0.016·(10a)-1;the trend of increase of summer hydrologic station was 0.202·(10a)-1,0.055·(10a)-1,0.112·(10a)-1,0.064·(10a)-1.The increasing trend rates of the three stations in autumn were 0.134·(10a)-1,0.08·(10a)-1,0.155·(10a)-1.In winter,the increasing trend rates of the three stations were 0.007·(10a)-1,0.027·(10a)-1,0.087·(10a)-1.(3)According to the Mann-kendall catastrophe test curve,the runoff of the three hydrologic stations of Mashq,Qilian and qingshizui changed abruptly between the lines of UF and UB of 0.05 significance critical value;the mutant years were 2010,1995 and 2014.
runoffmulti-year averageseasonal variationMann-kendall mutation test
万方数据
