Tide-induced recirculation across the aquifer-ocean interface

Robinson, C., Li, L. and Prommer, H. (2007) Tide-induced recirculation across the aquifer-ocean interface. Water Resources Research, 43 7: xx-xx. doi:10.1029/2006WR005679

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Author Robinson, C.
Li, L.
Prommer, H.
Title Tide-induced recirculation across the aquifer-ocean interface
Journal name Water Resources Research   Check publisher's open access policy
ISSN 0043-1397
Publication date 2007-01-01
Year available 2007
Sub-type Article (original research)
DOI 10.1029/2006WR005679
Open Access Status File (Publisher version)
Volume 43
Issue 7
Start page xx
End page xx
Total pages 14
Editor Parlange, M.B.
Place of publication Washington
Publisher Amer Geophysical Union
Language eng
Subject 291100 Environmental Engineering
260500 Hydrology
770000 - Environmental Management
Abstract 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.
Keyword Environmental Sciences
Water Resources
Submarine Groundwater Discharge
Unconfined Coastal Aquifer
Estuarine Surface-water
Subterranean Estuary
Contaminant Transport
Nutrient Discharge
Chesapeake Bay
Subtidal Pump
Q-Index Code C1
Q-Index Status Confirmed Code

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Created: Tue, 19 Feb 2008, 00:29:24 EST