Radon and Salinity Mass Balance Constraints on Groundwater Recharge on a Semi-Arid Island (Catalina, California)

Radon and Salinity Mass Balance Constraints on Groundwater Recharge on a Semi-Arid Island (Catalina, California)
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DOI：
10.3390/w14071068
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发表时间：
2022-03
期刊：
Water
影响因子：
3.4
通讯作者：
B. Hagedorn;Mitsuyo Tsuda
B. Hagedorn;Mitsuyo Tsuda
中科院分区：
环境科学与生态学3区
文献类型：
--
作者：
B. Hagedorn;Mitsuyo Tsuda

文献摘要

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量化海底地下水排放（SGD）的淡水成分对于分析陆地对海洋生态系统的影响以及评估沿海含水层的水预算和地下水补给至关重要。在半干旱到干旱环境中，这种量化很困难，因为低 SGD 率意味着沿海水域地下水溶质浓度低。在这项研究中，利用氡和盐度质量平衡模型的组合，对加利福尼亚州卡塔利娜岛托永湾的干季和湿季新鲜 SGD (FSGD) 进行了量化，并将结果与​​通过土壤水平衡 (SWB) 模型获得的流域特定地下水补给率进行了比较。计算出的 FSGD 率仅随季节略有变化，并且与 SWB 模型的补给估计值非常相似。虽然敏感性分析显示 FSGD 估计受到地下水端元地球化学变异性和水深波动的不确定性的显着影响，但本研究的结果支持基于 SWB 模型的补给率。这项研究的结果强调了基于氡和盐度质量平衡的 FSGD 估计作为地下水补给校准目标的效用，这可能有助于建立更精细的可持续地下水产量。
Quantifying the freshwater component of submarine groundwater discharge (SGD) is critical in the analysis of terrestrial influences on marine ecosystems and in assessing the water budget and groundwater recharge of coastal aquifers. In semi-arid to arid settings, this quantification is difficult because low SGD rates translate into low concentrations of groundwater solutes in coastal waters. In this study, fresh SGD (FSGD) was quantified for Toyon Bay on Catalina Island, California, for wet and dry seasons using a combination of radon and salinity mass balance models, and the results were compared to watershed-specific groundwater recharge rates obtained from soil water balance (SWB) modeling. Calculated FSGD rates vary only slightly with season and are remarkably similar to the recharge estimates from the SWB model. While sensitivity analyses revealed FSGD estimates to be significantly influenced by uncertainties in geochemical variability of the groundwater end-member and fluctuations of water depth, the results of this study support the SWB-model-based recharge rates. The findings of this study highlight the utility of the radon-and-salinity-mass-balance-based FSGD estimates as groundwater recharge calibration targets, which may aid in establishing more refined sustainable groundwater yields.