Arid Zone Research ›› 2023, Vol. 40 ›› Issue (8): 1229-1239.doi: 10.13866/j.azr.2023.08.03

• Land and Water Resources • Previous Articles     Next Articles

Comparative study on water area changes and influencing factors in the Guanting and Miyun reservoirs

MA Zhengang1,2(),LI Lili1,2,ZHANG Jungui1   

  1. 1. College of Tourism and Environment of Zhangjiakou University, Zhangjiakou 075000, Hebei, China
    2. Zhangjiakou Ecological Monitoring and Comprehensive Management Technology Innovation Center, Zhangjiakou 075000, Hebei, China
  • Received:2022-11-03 Revised:2023-06-08 Online:2023-08-15 Published:2023-08-24

Abstract:

This study focuses on the Guanting and Miyun reservoirs in the capital water conservation functional area to evaluate water area changes and analyze the impact of precipitation, vegetation coverage, and human water consumption since 1980. The study used long-term remote sensing images from 1980 to 2022 to extract the water area of each reservoir and calculate vegetation coverage. Pearson correlation analysis was used to explore the correlation between the three impact factors. We found that the water area of both reservoirs continuously increased, with historical highs since 2013, indicating significant water conservation achievements since the 18th National Congress of the Communist Party of China. In the past 40 years, the water area change process of the two reservoirs has significantly synchronized, with five different periods, including rising, high level maintenance, falling, ground feature maintenance, and recovery periods. There was no correlation between annual precipitation and reservoir area in the Zhangjiakou section upstream of the reservoir and also no correlation between precipitation and reservoir area in June and July during the same period. The vegetation coverage in the Zhangjiakou section upstream of the Guanting reservoir had an overall upward trend, with 2000 being a variation point. The vegetation coverage of the Zhangjiakou section upstream of the Miyun reservoir continues to stabilize at a level of 0.7. Correlation analysis shows that there is no correlation between vegetation coverage and reservoir water area. The artificial water consumption in the Zhangjiakou section of the Yongding River Basin decreased by 20 million m3 per year since 2000, showing a significant negative correlation with the water area of the Guanting reservoir and effectively increasing the inflow volume of the reservoir since 2019. The centralized water conveyance and water diversion from the Yellow River have had a significant impact on the water area of the Guanting reservoir and on ecological water replenishment along the river. Future research is needed to comprehensively evaluate the water conservation effectiveness of Zhangjiakou in terms of surface runoff into the reservoir, groundwater recovery, and ecological water replenishment.

Key words: water area, water conservation, evaluation, factor analysis, Guanting reservoir, Miyun reservoir