Dong-Chan Koh

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.

TL;DR: In this paper, the identification of sources and behavior of agricultural contaminants is important to control and manage groundwater quality of aquifer systems in rural areas, and a thorough evaluation of hydrodynamic and hydrochemical parameters in concert with multiple stable isotope ratios including dual isotopes of NO 3 − (N, O) and SO 4 2− (S, O), constitutes an effective approach for identifying sources and transformation processes in shallow groundwater systems underneath agricultural areas with different land use.

TL;DR: In this article, the authors applied time series analysis to investigate whether the groundwater quality in the coastal area is affected by the tide, and the results indicated that groundwater quality has been mainly controlled by the tidal level.

TL;DR: In this article, Tritium/helium-3 (3H/3He) and chlorofluorocarbons (CFCs) were investigated as environmental tracers in ground water from Jeju Island (Republic of Korea), a basaltic volcanic island.

TL;DR: The combination of groundwater age dating together with the use of chemical and isotopic parameters is a highly effective but yet underutilized approach for elucidating the sources and the fate of nitrate in aquifers in Asia.