Using δ18O and δ2H to Detect Hydraulic Connection Between a Sinkhole Lake and a First‐Magnitude Spring
Using δ18O and δ2H to Detect Hydraulic Connection Between a Sinkhole Lake and a First‐Magnitude Spring
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使用 δ18O 和 δ2H 检测天坑湖与一级弹簧之间的水力连接
DOI：
10.1111/gwat.13105
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发表时间：
2021
期刊：
影响因子：
2.6
通讯作者：
Fowler, Karlee
中科院分区：
文献类型：
--
作者：
Ahmed, Nur;Ye, Ming;Wang, Yang;Greenhalgh, Tom;Fowler, Karlee
在这项研究中，氧和氢同位素被用来检测一个天坑湖和岩溶泉之间的水力连接。在岩溶地区，流入湖泊的地表水可以通过湖底的天坑排到下面的含水层，然后在岩溶管道中流动并通过含水层基质。在位于美国佛罗里达西北部的研究地点，Miccosukee湖立即排入两个天坑。染料示踪实验的结果表明，湖水在天然桥泉（Natural Bridge Spring）排放，这是一个距离湖泊32公里的第一级泉。通过在2019年10月至2020年1月的干旱期间每周从湖泊，泉水和距离湖泊10米的地下水井中收集水样，发现当去除降雨对泉水同位素特征的影响时，泉水的同位素比增加可以通过将重同位素富集的湖水混合到地下水中来解释，表明湖和泉水之间有水力联系在几十公里的尺度和第一级弹簧的液压连接的这种检测以前在文献中没有报道。根据同位素比值数据，估计在研究期间，约8.5%的泉水是排入湖泊天坑的湖水。
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.
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