| 水位上升背景下北京市泉流量动态及水化学成因研究 |
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| 关键词:spring water in Beijing discharge dynamics hydrochemical genesis rising groundwater level driving factors |
| 基金项目:本文由北京市科技计划课题(编号: Z221100005222014; Z141100003614060; Z251100004525001)、北京市财政项目(编号: 11000022T000000440194)和北京市地下水环境监测与保护创新工作室项目(编号: 8181002)联合资助。 |
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| Study on the Discharge Dynamics and Hydrochemical Genesis of Spring Water in Beijing in the Context of Rising Groundwater Levels |
| As a vital natural resource, the spring water in Beijing has played a crucial role in supplying drinking water, maintaining the ecosystem, and enriching scenic landmarks. However, there has been no systematic research on the dynamic characteristics of spring discharge and hydrochemical properties. To address this gap, the driving factors of spring water discharge dynamics in the context of rising groundwater levels were analyzed, and the formation mechanisms of the spring water hydrochemistry based on 203 water samples were explored. The results showed that the increase in precipitation infiltration recharge, increase in river ecological water replenishment, and reduction of groundwater extraction after the South-to-North Water Diversion Project began supplying water to Beijing were the main driving factors for the recovery of spring discharge. The major karst springs have thus resumed flow. The hydrochemical characteristics of spring water were primarily controlled by rock weathering. The effects of evaporation, crystallization, and atmospheric precipitation were minor. Karst springs were mainly influenced by the weathering of carbonate rocks, whereas fissure springs were influenced by the weathering of silicate rocks. The Ca2?, Mg2?, HCO– 3 and SO2– 4 in spring water were mainly derived from the dissolution of carbonate rocks and gypsum. The Na? was mainly derived from the dissolution of salt rock minerals, and NO– 3 was from agricultural nitrate fertilizers. The percentage among 192 samples meeting the Class III standard was 89.07%, with the main noncompliant indicators being total hardness, NO– 3, SO2– 4, and CODMn. Rising groundwater levels have not yet significantly changed the quality of spring water in mountain areas. These findings provide a scientific basis for the rational utilization of groundwater resources and the protection of spring catchments. |
| LI Peng,LU Zhongyang,HAN Xu,HOU Chaoshuo,HE Baonan,WANG Xinjuan,DONG Pei,LIU Yin.2026.Study on the Discharge Dynamics and Hydrochemical Genesis of Spring Water in Beijing in the Context of Rising Groundwater Levels[J].Acta Geoscientica Sinica,47(2):348-360. |
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