Analysis of the change characteristic of river runoff in different climate zones
In order to probe into river runoff changing characteristics in different climae zones and based on the daily runoff data from 17 hydrological stations in Wei River basin,Huai River basin and Beijiang basin,this paper analyzes the change of annual runoff coefficients of non-uniformity,concentration ratio and concentration period.Mann-Kendall non-parameter statistical test is utilized to analyze the variation trend of monthly and annual runoff series.The results show that:① the coefficients of non-uniformity appear to decrease in Beijiang basin while in Wei River basin,except Linjiacun station,the coefficient doesn't show obvious change trend,so does the Huai River basin.② In these three basins,the distribution of concentration period in a year is stable and close to a periodic variation.Apart from Wei River basin's significant attenuation trend in annual runoff,the measured runoff data respectively show a weak decrease and an increasing trend in Huai River basin and Beijiang basin.Reactions to climate change and human activities that cause runoff variations are also analyzed here.It's shown that consistent changes take place between the runoff and precipitation and the human effect upon runoff behaviors in Wei and Beijiang basins cannot be ignored.
runoff changeconcentration ratioconcentration periodWei River basinHuai River basinBeijiang basin
国家科技期刊平台
NSTL
万方数据
维普
