Journal ArticleDOI
The groundwater resources and sustainable yield of Cheju volcanic island, Korea
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In this paper, the authors analyzed data from 455 water wells of Cheju volcanic island to determine hydrogeological characteristics, water quality, and sustainable yield of the groundwater resources in the island.Abstract:
Hydrogeologic data of 455 water wells comprising geologic logs, water qualities, and aquifer test results are analyzed to determine hydrogeological characteristics, water quality, and sustainable yield of the groundwater resources of Cheju volcanic island. The groundwater of the island occurs in unconsolidated pyroclastic deposits and clinkers interbedded in highly jointed basaltic and andesitic rocks as high-level, basal, and parabasal groundwater under unconfined conditions. The total storage of groundwater is estimated at about 44 billion m3. The average transmissivity and specific yield of the aquifer are at about 0.34 m2 s–1(29300 m2 day–1) and 0.12, respectively. The average annual precipitation is about 3.39 billion m3, of which 1.49 billion m3– equivalent to 44.0% of the total annual precipitation – is recharged into aquifers, with 0.638 billion m3 year–1 of runoff and 1.26 billion m3 year–1 of evapotranspiration. Based on a groundwater budget analysis, the sustainable yield is estimated at about 0.62 billion m3 year–1, equivalent to 41.6% of annual recharge. A low-permeability marine sedimentary formation (Sehwari formation), composed of loosely cemented sandy silt, was recently found to be situated at 120±68 m below mean sea level. If the said marine sediment is distributed as a basal formation of the freshwater zone of the island, most of its groundwater will be of parabasal type. So the marine sediment is one of the most important hydrogeological boundaries and groundwater occurrences in the area.read more
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Hydrogeochemical and isotopic evidence of groundwater salinization in a coastal aquifer: a case study in Jeju volcanic island, Korea
Yongje Kim,Kwang-Sik Lee,Dong-Chan Koh,Dae Ha Lee,Seung-Gu Lee,Won Bae Park,Gi Won Koh,Nam Chil Woo +7 more
TL;DR: In order to identify the origin of saline groundwater in the eastern part of Jeju volcanic island, Korea, a hydrogeochemical and isotopic study has been carried out for 18 observation wells located in east and southeast coastal regions as discussed by the authors.
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Large submarine groundwater discharge (SGD) from a volcanic island
TL;DR: In this article, the authors measured seepage rates of coastal groundwater from a volcanic island, standing in the South Sea of Korea, and 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.
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Using H- and O-isotopic data for estimating the relative contributions of rainy and dry season precipitation to groundwater : example from Cheju Island, Korea
TL;DR: In this article, a comparison of deuterium excess or d -values of precipitation and groundwater at Cheju Island, Korea, indicates that, unlike in many temperate climates, precipitation during the whole year contributes to groundwater recharge.
Journal ArticleDOI
Submarine groundwater discharge from oceanic islands standing in oligotrophic oceans: Implications for global biological production and organic carbon fluxes
TL;DR: In this article, the authors investigated submarine groundwater discharge (SGD)associated nutrient fluxes and budgets in two coastal embayments, Hwasun Bay and Bangdu Bay, off the volcanic island of Jeju, Korea.
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Groundwater occurrence on Jeju Island, Korea
TL;DR: In this article, the authors presented a summary of several studies on the occurrence and features of groundwater resources on Jeju Island, the largest island in Korea, and evaluated the distribution of each groundwater type through analyses of the spatial distribution of the Seogwipo Formation and the hydraulic gradient of the groundwater.