섬진강 주변 지하수의 수질 및 오염특성: 오염원 및 유해성 평가

다국어 초록 (Multilingual Abstract)

The groundwaters in the basin of Seomjin River are classified mainly into Na-Cl type with high EC and NaHCO 3 type with low EC, and are characterized by enriched K + , Mg 2+ , NO 3
- , and SO 4
2- contents. The epm fraction of Na + +Cl - in TDS increases in general with increasing EC of groundwater. The correlation patterns among dissolved ions indicate that Na + and Cl - are derived mainly from intruded seawater, and K + , Mg 2+ , and SO 4
2- from anthropogenic source such as a chemical fertilizer. The groundwaters that exceed the recommended limits for agricultural irrigation water contains 23% of Cl - reflecting sea-water intrusion, but 50% of NO 3
- as an anthropogenic pollution, among the wells investigated. In risk assessment of groundwaters by the EC-SAR relationship, only 40% of the groundwaters shows the suitable quality for agricultural irrigation water without any sodium and salinity hazards. Consequently, the pollution sources that cause degradation of groundwater quality in the basin of Seomjin River are the usage of chemical fertilizers and the intrusion of seawater, resulted primarily from the extension of riverward backflow of seawater and secondarily from the overpumping of groundwater.