广西凤山县鸳鸯泉水文地质成因探讨

【目的】研究凤山县鸳鸯泉的水文地质成因,为鸳鸯泉这一地质奇观提出科学的解释。【方法】根据实地调查和现场试验,结合地层岩性、地质构造以及岩溶发育情况,查明鸳鸯泉的岩溶水文地质条件;根据地下水示踪试验,确定鸳鸯泉的源头和主要的岩溶含水介质类型,并通过稳定氢氧同位素和钙锶比(Ca/Sr)分析,研究管道介质岩溶大泉的补径排过程和水循环特征。【结果】鸳鸯泉的源头为年里落水洞补给的外源水,公塘和母塘两个出口的主径流管道基本一致;鸳鸯泉具有以岩溶管道为主的含水介质特征,以及快速流的补给、径流和排泄过程。这种水文地质现象的成因与管道流集中排泄的方式有关。【结论】鸳鸯泉同属于一个管道系统,管道流的两个出口在水循环速度上存在差异,相比公塘,母塘具有较短的径流途径和较快的更新速率。

Discussion on Hydrogeological Genesis of Yuanyang Spring in Fengshan County,Guangxi

Objective] The research on hydrogeological genesis of Yuanyang Spring in Fengshan County could make this geological wonder a scientific explanation.Methods] Combined with lithology, geological structure and karst development, the karst hydrogeological conditions of Yuanyang Spring were identified by field investigations and trials. According to the groundwater tracer test, the source of Yuanyan Spring and the main types of karst aqueous media were determined. Stable oxygen and hydrogen isotopes, calcium strontium ratio (Ca/Sr) were used to study the recharge, runoff and discharge processes of karst springs of conduit medium and water cycle characteristics.Results] The source of Yuanyang Spring was the groundwater from Nianli Sinkhole.The main runoff pipes of the two outlets of Father Spring and Mother Spring were basically the same.The aquifer medium was dominated by karst conduit.The groundwater recharge,runoff and discharge process were characterized by fast-flow.The genesis of Yuanyang Spring was related to the concentrated discharge of karst conduit flow.Conclusion] The two sub springs (father spring and mother spring) in Yuanyang Spring belonged to the same karst conduit system.The two outlets of the pipeline flow had differences in the water circulation speed. Compared with father spring, the mother spring had a shorter runoff path and a faster update rate.