Study on the driving factors of karst spring restoration in Western Beijing——a case study of the Yu Spring area

WANG Shufang

doi:10.3969/j.issn.1000-1123.2025.11.005

Abstract：Springs serve as vital indicators of water ecological health,and the dynamic changes in water balance within spring areas comprehensively reflect climate change,social development,and the status of water resource development and utilization.The karst large spring,Yu Spring,located in Western Beijing,has experienced a cessation of flow since 1975.Due to the extensive area of the spring and the complex karst geological structure,achieving ecological restoration of such karst springs economically and effectively has been a longstanding challenge in the field of hydrogeology.Focusing on the Yu Spring area,this study collected data from 1961 to 2024,including atmospheric precipitation,groundwater levels,groundwater extraction volumes,and discharge volumes of the Yongding River.Utilizing regression analysis and wavelet analysis,the study elucidated the driving processes of groundwater extraction,Yongding River discharge,and atmospheric precipitation on changes in groundwater levels within the spring area.The annual average groundwater level variation trend equation was established,and the highest and lowest water levels within the year were delineated.Based on current groundwater extraction volumes,Yongding River discharge volumes,and multi-year average precipitation,predictions and mappings of annual average groundwater levels,as well as intra-annual maximum and minimum water levels from 2025 to 2028,were conducted.The results indicate that Yu Spring may experience intermittent resurgence after the flood season in 2026,with the potential for sustained flow resumption following the flood season in 2027.