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Using δ18O and δ2H to Detect Hydraulic Connection Between a Sinkhole Lake and a First-Magnitude Spring
Ground Water ( IF 2.6 ) Pub Date : 2021-04-19 , DOI: 10.1111/gwat.13105
Nur Ahmed 1 , Ming Ye 1 , Yang Wang 1 , Tom Greenhalgh 2 , Karlee Fowler 3
Affiliation  

Oxygen and hydrogen isotopes were used in this study to detect a hydraulic connection between a sinkhole lake and a karst spring. In karst areas, surface water that flows to a lake can drain through sinkholes in the lakebed to the underlying aquifer, and then flows in karst conduits and through aquifer matrix. At the study site located in northwest Florida, USA, Lake Miccosukee immediately drains into two sinkholes. Results from a dye tracing experiment indicate that lake water discharges at Natural Bridge Spring, a first-magnitude spring 32 km downgradient from the lake. By collecting weekly water samples from the lake, the spring, and a groundwater well 10 m away from the lake during the dry period between October 2019 and January 2020, it was found that, when rainfall effects on isotopic signature in spring water are removed, increased isotope ratios of spring water can be explained by mixing of heavy-isotope-enriched lake water into groundwater, indicating hydraulic connection between the lake and the spring. Such a detection of hydraulic connection at the scale of tens of kilometers and for a first-magnitude spring has not been previously reported in the literature. Based on the isotope ratio data, it was estimated that, during the study period, about 8.5% the spring discharge was the lake water that drained into the lake sinkholes.

中文翻译:

用δ18O和δ2H检测沉孔湖和一等弹簧之间的液压连接

本研究使用氧和氢同位素来检测落水湖和岩溶泉之间的水力联系。在岩溶地区,流入湖泊的地表水可以通过湖床的天坑排到下伏含水层,然后流入岩溶管道和含水层基质。在位于美国佛罗里达州西北部的研究地点,Miccosukee 湖立即流入两个污水坑。染料示踪实验的结果表明,湖水在天然桥泉处流出,天然桥泉是距湖水下降 32 公里的一级泉。通过在 2019 年 10 月至 2020 年 1 月的枯水期从湖泊、泉水和距湖泊 10 m 的地下水井每周采集水样,发现当降雨对泉水中同位素特征的影响被去除后,泉水同位素比率增加的原因是富含重同位素的湖水与地下水混合,表明湖水与泉水之间存在水力联系。以前文献中没有报道过这种在几十公里范围内和一等弹簧的液压连接检测。根据同位素比数据,估计在研究期间,约 8.5% 的泉水是排入湖泊落水洞的湖水。
更新日期:2021-04-19
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