Subjects: Geosciences >> Hydrology submitted time 2023-08-26 Cooperative journals: 《干旱区研究》
Abstract： This study focuses on the Guanting and Miyun reservoirs in the capital water conservation functionalarea to evaluate water area changes and analyze the impact of precipitation, vegetation coverage, and humanwater consumption since 1980. The study used long-term remote sensing images from 1980 to 2022 to extract thewater area of each reservoir and calculate vegetation coverage. Pearson correlation analysis was used to explorethe correlation between the three impact factors. We found that the water area of both reservoirs continuouslyincreased, with historical highs since 2013, indicating significant water conservation achievements since the 18thNational Congress of the Communist Party of China. In the past 40 years, the water area change process of thetwo reservoirs has significantly synchronized, with five different periods, including rising, high levelmaintenance, falling, ground feature maintenance, and recovery periods. There was no correlation betweenannual precipitation and reservoir area in the Zhangjiakou section upstream of the reservoir and also nocorrelation between precipitation and reservoir area in June and July during the same period. The vegetationcoverage in the Zhangjiakou section upstream of the Guanting reservoir had an overall upward trend, with 2000being a variation point. The vegetation coverage of the Zhangjiakou section upstream of the Miyun reservoircontinues to stabilize at a level of 0.7. Correlation analysis shows that there is no correlation between vegetationcoverage and reservoir water area. The artificial water consumption in the Zhangjiakou section of the YongdingRiver Basin decreased by 20 million m3 per year since 2000, showing a significant negative correlation with thewater area of the Guanting reservoir and effectively increasing the inflow volume of the reservoir since 2019. Thecentralized water conveyance and water diversion from the Yellow River have had a significant impact on thewater area of the Guanting reservoir and on ecological water replenishment along the river. Future research isneeded to comprehensively evaluate the water conservation effectiveness of Zhangjiakou in terms of surfacerunoff into the reservoir, groundwater recovery, and ecological water replenishment.
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