Large submarine groundwater discharge (SGD) from a volcanic island

Details Large submarine groundwater discharge (SGD) from a volcanic island Large submarine groundwater discharge (SGD) from a volcanic island

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30uoce3k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 21, pp. OCE 3-1, CiteID 2098, DOI 10.1029/2003GL018378

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13

Oceanography: Biological And Chemical: Benthic Processes/Benthos, Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling, Oceanography: Biological And Chemical: Geochemistry, Oceanography: Biological And Chemical: Radioactivity And Radioisotopes, Oceanography: Biological And Chemical: Stable Isotopes

Scientific paper

We measured seepage rates of coastal groundwater from a volcanic island, standing in the South Sea of Korea. The seepage rates measured along the sandy coast were in the range 50-300 m/yr, which are much higher than those reported from typical continental coast. The 18O tracer in potential seeping waters signifies that they are mixtures of basal groundwater and pristine seawaters. On the eastern coast of Jeju, almost all groundwater discharge is attributed to recirculating seawater, while fresh groundwater contributes about 20% of the total submarine groundwater discharge (SGD) on the western coast of Jeju. Thus, SGD appears to be important for the management of water resources in western Jeju. The measured radionuclides (228Ra, 226Ra, and 222Rn) and nutrients in the groundwater suggest that the discharge of both fresh and recirculated seawater will have a significant influence on the budget of coastal nutrients and other chemical constituents in this region.

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