JOURNAL OF NATURAL RESOURCES ›› 2021, Vol. 36 ›› Issue (1): 256-269.doi: 10.31497/zrzyxb.20210117

• Resources Distribution and Efficiency • Previous Articles     Next Articles

The trend of runoff change and its attribution in the middle reaches of the Yellow River

NING Yi-nan1,2(), YANG Xiao-nan3, SUN Wen-yi1,4(), MU Xing-min1,4, GAO Peng1,4, ZHAO Guang-ju1,4, SONG Xiao-yan5   

  1. 1. Institute of Soil and Water Conservation, CAS and Ministry of Water Resources, Yangling 712100, Shaanxi, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Mountain Areas Research Institute of Hebei Province, Agricultural University of Hebei, Baoding 071001, Hebei, China
    4. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, Shaanxi, China
    5. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
  • Received:2019-11-06 Revised:2020-06-19 Online:2021-01-28 Published:2021-03-28
  • Contact: SUN Wen-yi E-mail:ningyinan18@mails.ucas.ac.cn;sunwy@ms.iswc.ac.cn

Abstract:

Changes in the water and sediments of the Yellow River are associated with ecosystem security and quality development throughout the basin. It is of great significance to quantify the contribution of climate change and human activities to the reduction of runoff in order to analyze the causes of water and sediment changes in the Yellow River. Due to different research scales and research methods, the factors and influence degree of runoff variation vary greatly. Therefore, based on the same time scale, this paper uses MK trend test and Double Mass Curve method to systematically analyze the changing trend of hydrological elements in four typical basins (Huangfuchuan, Kuye River, Wuding River and Yanhe River) in the middle reaches of the Yellow River from 1960 to 2015. The Budyko water heat balance equation is used to clarify the role of climate change and human activities in the water and sediment change of the basin. The results showed that the runoffs in Huangfuchuan, Kuye River, Wuding River and Yanhe River basins all decreased significantly from 1960 to 2015 (P<0.01), and the runoffs in 1979 and 1999 experienced sudden changes without significant variations in precipitation. Compared with the base period (1960-1979), the contribution rate of climate change to runoff reduction in the P2 period (1980-1999) reached 64%-76%; with the large-scale implementation of the project of returning farmland to forestland and grassland, human activities in the P3 period (2000-2015) have become the main influencing factor leading to runoff reduction, with a contribution rate of 71%-88%.

Key words: Hekou-Longmen section, runoff, climate change, human activities, Budyko equation, elasticity coefficient