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Using hydrogeochemical indicators to interpret groundwater flow and geochemical evolution of a freshwater lens on Majuro Atoll, Republic of the Marshall Islands

Yoshimoto, Shuhei ; Ishida, Satoshi ; Kobayashi, Tsutomu ; Koda, Kazuhisa ; Tsuchihara, Takeo ; Shirahata, Katsushi

Hydrogeology journal, 2020-05, Vol.28 (3), p.1053-1075 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Using hydrogeochemical indicators to interpret groundwater flow and geochemical evolution of a freshwater lens on Majuro Atoll, Republic of the Marshall Islands
Autor: Yoshimoto, Shuhei ; Ishida, Satoshi ; Kobayashi, Tsutomu ; Koda, Kazuhisa ; Tsuchihara, Takeo ; Shirahata, Katsushi
Assuntos: Anthropogenic factors ; Aquatic Pollution ; Aquifers ; Atolls ; Calcite ; Calcium ; Carbonate sediments ; Carbonates ; Chemical composition ; Denitrification ; Earth and Environmental Science ; Earth Sciences ; Evolution ; Fresh water ; Freshwater ; Geochemistry ; Geology ; Geophysics/Geodesy ; Groundwater ; Groundwater flow ; Groundwater movement ; Groundwater quality ; Holocene ; Hydrogeochemistry ; Hydrogeology ; Hydrology/Water Resources ; Inland water environment ; Lenses ; Magnesium ; Organic matter ; Palaeo studies ; Pleistocene ; Recharging ; Residence time ; Saline water ; Sediments ; Sulfate reduction ; Sulfur ; Sulfur hexafluoride ; Sulphate reduction ; Sulphur ; Surveys ; Unconformity ; Waste Water Technology ; Water flow ; Water Management ; Water Pollution Control ; Water quality ; Water Quality/Water Pollution
É parte de: Hydrogeology journal, 2020-05, Vol.28 (3), p.1053-1075
Descrição: Groundwater flow and the geochemical evolution of a freshwater lens in an aquifer on a Pacific atoll were investigated by hydrogeochemical surveys. Sulfur hexafluoride measurements showed that deeper groundwater and groundwater at the periphery of the lens are older, consistent with a downward and outward groundwater flow scheme. This is the typical flow scheme on Pacific atolls where a Holocene–Pleistocene unconformity restricts the shape of the freshwater lens. Enrichment of Mg/Ca in the groundwater is another indicator of a longer residence time, because contact between the groundwater and the carbonate sediments composing the aquifer leads to the release of Mg from high-Mg calcite and the precipitation of Ca as low-Mg calcite. Groundwater quality was also affected by anthropogenic nitrogen loading and aboveground organic matter, which were altered by denitrification and sulfate reduction in the aquifer, especially in the older groundwater. The chemical composition of the groundwater in the center of the island, where saline water is up-coning, implies that freshwater recharge dilutes the older saline water, which as time passes will eventually be replaced by newly recharged freshwater.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Using hydrogeochemical indicators to interpret groundwater flow and geochemical evolution of a freshwater lens on Majuro Atoll, Republic of the Marshall Islands

Yoshimoto, Shuhei ; Ishida, Satoshi ; Kobayashi, Tsutomu ; Koda, Kazuhisa ; Tsuchihara, Takeo ; Shirahata, Katsushi

Berlin/Heidelberg: Springer Berlin Heidelberg

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