Effect of climate variability and human activities on runoff in the Jinghe River Basin, Northwest China
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- 作者：Jun-qiang Yao ; Qiu-dong Zhao ; Zhi-hui Liu
- 关键词：Water resource ; Runoff ; Climate variability ; Precipitation ; Jinghe River Basin
- 刊名：Journal of Mountain Science
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：12
- 期：2
- 页码：358-367
- 全文大小：999 KB
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文摘
Much attention has recently been focused on the effects of climate variability and human activities on the runoff. In this study, we analyzed 56-yr (1957-012) runoff change and patterns in the Jinghe River Basin (JRB) in the arid region of northwest China. The nonparametric Mann-Kendall test and the precipitation-runoff double cumulative curve (PRDCC) were used to identify change trend and abrupt change points in the annual runoff. It was found that the runoff in the JRB has periodically fluctuated in the past 56 yr. Abrupt change point in annual runoff was identified in the JRB, which occurred in the years around 1964 and 1996 dividing the long-term hydrologic series into a natural period (1957-964) and a climate and man-induced period (1965-996 and 1997-012). In the 1965-996 period, human activities were the main factor that decreased runoff with contribution of 88.9%, while climate variability only accounted for 11.1%. However, the impact of climate variability has been increased from 11.1% to 47.5% during 1997-012, showing that runoff in JRB is more sensitive to climate variability during global warming. This study distinguishes the effect of climate variability from human activities on runoff, which can do duty for a reference for regional water resources assessment and management.