An effect of pier pilings on nearshore submarine groundwater discharge from a (partially) confined aquifer

Stieglitz, Thomas C., Rapaglia, John, and Krupa, Steven C. (2007) An effect of pier pilings on nearshore submarine groundwater discharge from a (partially) confined aquifer. Estuaries and Coasts, 30 (3). pp. 543-550.

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Abstract

Concurrent bulk ground conductivity mapping and direct measurements of seepage rates were carried out near a pier at Shelter Island, New York, U.S.A. A shallow sediment layer was identified to provide confinement for lower aquifer units. The conductivity and seepage rate data indicate that pilings of the pier apparently pierce this shallow sediment layer, producing a comparatively high seepage rate driven by the hydraulic head of the (partially) confined aquifer, resulting in a substantial increase in submarine groundwater discharge (SGD) near the pier. Seepage rate measurements made close to the pier, which runs perpendicular to the shoreline, cannot be considered representative for the area. At the study site, the magnitude of SGD depends both on the distance from shore and on the distance from the pier, a rmding that confounds the commonly observed patterns of decreasing SGD with increasing distance from shore. This alteration of a groundwater flow pattern is a previously undescribed effect of anthropogenic perturbation in a coastal system.

Item ID: 2552
Item Type: Article (Research - C1)
ISSN: 1559-2731
Keywords: submarine groundwater discharge; pier pilings; aquifer
Date Deposited: 03 Jul 2009 03:00
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 100%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 100%
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