Affiliation: | (1) Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources, 305-350 Daejeon , Korea;(2) School of Earth and Environmental Sciences, Seoul National University, 151-742 Seoul , Korea;(3) School of Earth and Environmental Sciences, Seoul National University, 151-742 Seoul , Korea;(4) School of Earth and Environmental Sciences, Seoul National University, 151-742 Seoul , Korea; |
Abstract: | This study has evaluated the main hydrogeochemical characteristics that affect the quality of shallow groundwater in the coastal area at Kimje in South Korea. In this area, the chemical composition of groundwater is mostly classified into Na+?Cl? and Ca2++Mg2+?NO3-+Cl? types. These types are affected by three major factors: seawater intrusion, fertilizers and redox processes. The Na+?Cl? type, which is generally localized in the coastal area, shows typical characteristics of groundwater affected not only by modern seawater but also by old seawater residing in the reclaimed land. In contrast, the Ca2++Mg2+?NO3-+Cl? type, which is usually found inland, is very contaminated by fertilizers. As groundwater flows from the inland area to the coast, the redox condition changes from an oxic condition to a suboxic/anoxic condition. In addition, the reclamation has caused a large amount of underlying organic matter. These effects provide optimum conditions for the occurrence of redox processes in the coastal area. |