Evidence of freshened groundwater below a tropical fringing reef
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PAPER
Evidence of freshened groundwater below a tropical fringing reef Benjamin Hagedorn 1 & Matthew W. Becker 1 & Nyssa J. Silbiger 2 Received: 24 December 2019 / Accepted: 21 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Submarine groundwater discharge (SGD) is widely acknowledged as a key driver of environmental change in tropical island coral reefs. Previous work has addressed SGD and groundwater-reef interactions at isolated submarine springs; however, there are still many outstanding questions about the mechanisms and distribution of groundwater discharge to reefs. To understand how groundwater migrates to reefs, a series of offshore 222Rn (radon) and submarine electrical resistivity (ER) surveys were performed on the tropical volcanic island of Mo’orea, French Polynesia. These surveys suggest that fresher water underlies the fringing reef, apparently confined by a
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