Abstract
Application of natural tracers such as radon isotope mass balance has been useful in estimating the submarine groundwater discharge (SGD). This study used 222Rn and evaluated the magnitude of SGD at Tiruchendur coast of southeast India in the Gulf of Mannar (Indian Ocean). Higher magnitudes of 222Rn in the porewater and seawater in comparison with the groundwater suggest simultaneous SGD with fluxes of 0.1–0.25 m3 m−2 d−1 at offshore and 0.4–0.20 m3 m−2 d−1 at the near shore. These baseline data would contribute to the management and protection of the Gulf of Mannar region in near future.
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