Tide‐induced recirculation across the aquifer‐ocean interface
Tide‐induced recirculation across the aquifer‐ocean interface
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DOI：
10.1029/2006wr005679
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发表时间：
2007-07
影响因子：
5.4
通讯作者：
Clare Robinson;Ling Li;Henning Prommer
中科院分区：
文献类型：
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作者：
Clare Robinson;Ling Li;Henning Prommer
通过参数分析来研究潮汐、内陆水力条件和含水层特性对潮汐引起的海水通过近岸含水层再循环速率的影响。了解这种影响对于准确预测通过地下水排放进入沿海水域的地下化学通量至关重要。该分析基于沿海含水层中与密度相关的地下水流的数值模拟，该含水层受到倾斜海滩面潮汐振荡的影响。结果表明，潮汐振荡幅度和内陆水力梯度是控制潮汐引起的再循环率的主要参数。当潮汐与内陆强迫之比很大时，预计会出现显着的潮汐交换。水平潮汐海岸线偏移和含水层深度均表现出渐近行为，仅影响很小的值的再循环率，其中交换过程分别受到渗透潜力和含水层浅度的限制。分析还表明，由于咸水楔内的对流流动增强，潮汐效应增加了密度驱动的再循环率。
A parametric analysis is conducted to examine the influence of tides, inland hydraulic conditions, and aquifer properties on the rate of tide‐induced seawater recirculation through the nearshore aquifer. Understanding such influence is crucial for accurate prediction of subsurface chemical fluxes to coastal waters via groundwater discharge. The analysis is based on numerical simulations of density‐dependent groundwater flow in a coastal aquifer subject to tidal oscillations across a sloping beach face. The results reveal that the amplitude of tidal oscillations and the inland hydraulic gradient are the primary parameters controlling the tide‐induced recirculation rates. Significant tidal exchange is expected when the ratio of tidal to inland forcing is large. The horizontal tidal shoreline excursion and aquifer depth both display asymptotic behavior, influencing recirculation rates for only small values where the exchange process is limited by the potential for infiltration and shallowness of the aquifer, respectively. The analysis also indicates that tidal effects increase density‐driven recirculation rates due to enhanced convective flow within the saltwater wedge.