| Title |
Monitoring Study on Groundwater Quality of an Alluvial Plane in the North Han River Basin |
| Authors |
최중대(Joong Dee Choi),장석오(Seok Oh Jang),최병용(Byung Yong Choi),류순호(Soon Ho Ryu) |
| Abstract |
The effects of land use in a small agricultural alluvial watershed on groundwater quality were investigated. Existing 20 farm wells were selected as monitoring wells representing different land uses. EC, T-N, NO₃-N, NH₄-N, Org-N, T-P and Cl^- concentrations were monitored every 2 weeks or 1 month for 1 to 2 years. EC was low at the upper watershed and increased towards the lower watershed. Average EC of natural water quality area of the upper most watershed was 0.077 dS/m and was 14∼38% of the ECs of the other land uses. Average NO₃-N concentrations of greenhouse, livestock and residential land uses exceeded the 10 ㎎/1 limit for drinking water. Org-N and NH₄-N concentrations were relatively small compared to NO₃-N concentration and T-N concentration was mostly affected by NO₃-N concentration. NO₃-N concentration occupied more than 90% of T-N concentration of paddy and upland areas. T-N concentration was higher after growing season than during growing season. T-P concentrations did not show any trend with respect to time and land use. Correlations between EC and T-N and EC and Cl^- were analyzed and the R² were 0.7706 and 0.6567, respectively. Monthly amount of rainfall appeared to be influential to groundwater quality and long-term monitoring studies were suggested to consider the effect of rainfall on groundwater quality. |