Tide‐induced recirculation across the aquifer‐ocean interface

C Robinson, L Li, H Prommer - Water Resources Research, 2007 - Wiley Online Library
Water Resources Research, 2007Wiley Online Library
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 …
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.
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