Arid Zone Research ›› 2021, Vol. 38 ›› Issue (6): 1506-1513.doi: 10.13866/j.azr.2021.06.02

• Water Resources and Utilization • Previous Articles     Next Articles

Characteristics of water and sediment variation in the Huangfuchuan basin and its influencing factors

LIU Qiang1,2(),YU Feihong1,CHANG Kangfei1,WANG Rui1,JING Yuanning1,MU Xingmin2()   

  1. 1. College of Resources and Environmental Engineering, Tianshui Normal University, Tianshui 741000, Gansu China
    2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China
  • Received:2021-01-27 Revised:2021-03-31 Online:2021-11-15 Published:2021-11-29
  • Contact: Xingmin MU E-mail:guangmingliu1983@163.com;xmmu@ms.iswc.ac.cn

Abstract:

Based on monitoring data of precipitation, runoff, and sediment discharge in the Huangfuchuan basin during 1954-2018, the characteristics of water and sediment cycle evolution in Huangfuchuan basin were studied using linear trend methods, Mann-Kendall tests, and cumulative anomaly methods. The contribution rates of precipitation change and human activities to runoff and sediment transport change in the Huangfuchuan basin were quantitatively evaluated using hydrological analysis methods. The results show that precipitation does not significantly decrease with time, whereas runoff and sediment transport significantly decrease with time, with a greater decreasing trend in runoff than sediment transport. The abrupt change of runoff and sediment transport from abundant to dry occurred in 1986. Using 1954-1986 as a reference period, the impacts of human activity on runoff and sediment transport in the Huangfuchuan basin from 1987 to 2018 were 83.04% and 75.24%, respectively. The impact of precipitation change on runoff and sediment transport in the Huangfuchuan basin was 16.96% and 24.76%, respectively. Further, reduced runoff capacity contributed more than 85% to changes in sediment transport. Precipitation change and human activities are both important factors influencing reduced runoff and sediment in the Huangfuchuan basin. Increasing human activities in the basin are the main factors reducing runoff and sediment transport in the Huangfuchuan basin, with reduced precipitation caused by climate change as a secondary factor.

Key words: Huangfuchuan basin, precipitation, human activities, runoff, sediment runoff