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Arid Land Geography ›› 2022, Vol. 45 ›› Issue (4): 1022-1031.doi: 10.12118/j.issn.1000-6060.2021.452

• Climatology and Hydrology • Previous Articles     Next Articles

Changes of runoff and precipitation in the upstream of Yellow River during the past 60 years

CHENG Yi1,2(),WU Lanzhen3,LIU Fenggui1,SHEN Yanjun1,2()   

  1. 1. College of Geosciences, Qinghai Normal University, Xining 810008, Qinghai, China
    2. Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050022, Hebei, China
    3. Water Conservancy and Hydropower Engineering College, Gansu Agricultural University, Lanzhou 730070, Gansu, China
  • Received:2021-10-07 Revised:2021-12-27 Online:2022-07-25 Published:2022-08-11
  • Contact: Yanjun SHEN E-mail:chengyi@sjziam.ac.cn;yjshen@sjziam.ac.cn

Abstract:

In this research, linear trend test, M-K trend test, Spearman’s rank correlation test, M-K test, Pettitt’s nonparametric test, orderly clustering analysis, the cumulative departure method, and the double-mass curve were applied to study the precipitation and runoff variation characteristics of upstream of the Yellow River, China. Further, the relationship between runoff and precipitation is discussed. Results show an insignificant increasing trend in rainfall in the upstream of the Yellow River, while runoff exhibits a distinct decreasing trend. Both precipitation and runoff present a significant deflection point, whose change rate between before and after is 4.67% (2003) and 35.34% (1986), respectively. For the three subregions, subregion I: above Tangnaihai station, subregion II: from Tangnaihai to Xiaheyan, and subregion III: from Xiaheyan to Toudaoguai, rainfall presents a significant increasing trend, an insignificant increasing trend, and a significant decreasing trend. However, runoff, for all subregions, exhibits a significant decreasing trend. With subregion I taken as the baseline, the relative impact of precipitation on runoff in subregion II is 25.08%. Consequently, the nonprecipitation factors account for 74.92%. Similarly, the percentage for subregion III is 32.14% and 67.86%, respectively. This research will offer theoretical references for water resource management and planning.

Key words: the upstream of Yellow River and its regions, runoff, precipitation, variation characteristics, response relationship