HR: 0800h
AN: H51B-0448    [Abstracts]
TI: Trend Analysis For Nitrate And Chloride Concentrations Of Groundwater In Jeju Island
AU: Kim, G
EM: gbkim@kwater.or.kr
AF: Korea Water Resources Corporation, San 6-2, Yeonchuk-dong, Daedeok-gu, Daejeon, 306-711, Korea, Republic of
AU: * Moon, S
EM: msh@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305-350, Korea, Republic of
AU: Park, W
EM: gwaterpark@jdi.re.kr
AF: Jeju Development Institute, Donam-dong, Jeju-Si, Jeju, 690-029, Korea, Republic of
AU: Kang, B
EM: brkang@jeju.go.kr
AF: Jeju Provincial Water Resources Management Office, Jocheon-up, Daehul-ri 2778-30, Jeju, 690-962, Korea, Republic of
AU: Kim, Y
EM: yckim@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305-350, Korea, Republic of
AB: The purpose of this study is to evaluate the trend of groundwater contamination in Jeju Island. We collected and analyzed 8,795 groundwater quality data which has been reported from 1989 to 2006 by Jeju Provincial Institute of Health and Environment. To analyze the trend of groundwater quality, we focused on the variations of chloride and nitrate concentration which are considered to be the most influencing components for groundwater quality in Jeju Island. The regional trend of groundwater quality was evaluated by using the lattice concept. Single grid was determined to be 500m x 500m considering aquifer features of volcanic rocks and low-slope topography and 7,361 rectangle grids were drawn for the whole island. All data within each lattice were collected and arranged in time series order and analyzed by using Sen's method. Although any trends of the average monthly concentrations for chloride and nitrate are not found, 32 lattices (16.2 percent) of total 198 lattices showed upward trend of chloride concentration and 46 lattices (22.5 percent) of total 205 lattices showed upward trend of nitrate concentration. Especially, upward trends for nitrate concentration are distinct in the low mid-mountainous areas (EL 100 to 250m) of western and southern watersheds, which original forests have been continuously urbanized or cultivated since early бо90s. Therefore, to maintain good groundwater quality in Jeju Island, future groundwater management needs to be carefully focused on the land use decisions in the mid-mountainous areas near Halla Mountain.
DE: 1800 HYDROLOGY
DE: 1831 Groundwater quality
DE: 3270 Time series analysis (1872, 4277, 4475)
SC: Hydrology [H]
MN: 2007 Fall Meeting