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GEOPHYSICAL RESEARCH LETTERS,
VOL. 37,
L16401,
6 PP., 2010
doi:10.1029/2010GL044066
Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, 222Rn, and salinity measurements
Department of Geological Sciences, University of Texas at Austin, Austin, Texas, USA
Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
National Institute of Geological Sciences, University of the Philippines Diliman, Quezon City, Philippines
National Institute of Geological Sciences, University of the Philippines Diliman, Quezon City, Philippines
Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
Marine Science Institute, University of the Philippines Diliman, Quezon City, Philippines
Submarine groundwater discharge (SGD) is an important component of the hydrologic cycle connecting terrestrial to marine environments. SGD in fringing reefs and its consequences on biogeochemistry and ecology remain mostly unexplored. The 222Rn activity and salinity of seawater indicate a substantial groundwater contribution throughout most of the 20 km2 studied tropical reef in Pangasinan, Philippines. Over 30 km of electrical resistivity profiles with a penetration depth of 12.5 m shows widespread zones within the reef that are much more resistive than porous reef rocks or sediment saturated with typical seawater. Some discrete resistive areas are located close to where seawater has 222Rn peaks and where geologic lineaments are likely located suggesting that these are preferential pathways for fresher groundwater discharging to the reef. SGD at the site could be a major ecological factor connecting the reef to the subsurface environment which in turn may lead to connections to land.
Received 20 May 2010; accepted 21 July 2010; published 24 August 2010.
Citation: (2010), Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, 222Rn, and salinity measurements, Geophys. Res. Lett., 37, L16401, doi:10.1029/2010GL044066.
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