Analysis of Runoff Variation Characteristics and Influencing Factors in the Wujiang River Basin in the Past 30 Years

Wenxian Guo, Jianwen Hu and Hongxiang Wang
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Wenxian Guo: School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Jianwen Hu: School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Hongxiang Wang: School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, China

IJERPH, 2021, vol. 19, issue 1, 1-16

Abstract: Changes in climate and the underlying surface are the main factors affecting runoff. Quantitative assessment of runoff characteristics, and determination of the climate and underlying surface contribution to changes in runoff are critical to water resources management and protection. Based on the runoff data from the Wulong Hydrological Station, combined with the Mann-Kendall test, Indicators of Hydrologic Alteration (IHA), Budyko hypothesis, and changes in climate and the underlying surface, this study comprehensively analyzed the runoff in the Wujiang River Basin (WRB). The results showed that: (1) The annual runoff of Wujiang River showed a downward trend, and an abrupt change occurred in 2005. (2) The overall hydrological change in WRB is 46%, reaching a moderate change. (3) The contribution rates of precipitation (P), potential evaporation ( ET 0 ), and underlying surface to runoff changes are 61.5%, 11.4%, and 26.9%, respectively. (4) After 2005, the WRB has become more arid, human activities have become more active, vegetation coverage has increased, and the built-up land has increased significantly.

Keywords: Budyko hypothesis; runoff change; climate change; underlying surface; Indicators of Hydrologic Alteration; Wujiang River Basin (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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