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http://dx.doi.org/10.3741/JKWRA.2007.40.6.469

Regional Trend Analysis for Groundwater Quality in Jeju Island - Focusing on Chloride and Nitrate Concentrations -  

Kim, Gyoo-Bum (National Groungwater Information Management and Service Center, KWATER)
Kim, Ji-Wook (Department of Investigation and Planning, KWATER)
Won, Jong-Ho (Department of Investigation and Planning, KWATER)
Koh, Gi-Won (Water Resources Office of Jeju Special Self-Governing Province)
Publication Information
Journal of Korea Water Resources Association / v.40, no.6, 2007 , pp. 469-483 More about this Journal
Abstract
Nitrate and chloride are the most common contaminants in groundwater and their concentrations increase easily due to fertilizer consumption and urbanization. The number of time series data for groundwater quality at a single site was not sufficient to analyze trends on Jeju Island. Therefore rectangle grids were drawn for the whole island and single grid was determined to be $500m{\times}500m$ after considering similar stream density, homogeneous hydraulic coefficients, geologic features of volcanic rock and low topographic slopes. All data within each lattice were collected and arranged in time series order and analyzed using Sen's method. 10.6 % of the total lattices for chloride and 22.4% for nitrate showed upward trends from the early 1990's to the early 2000's. Especially, upward trends for nitrate concentration are distinct in the low mid-mountainous areas of western and southern watersheds. Many septic tanks and much domestic waste from the urbanization of the low mid-mountainous area have produced this upward trend. Additionally, the agricultural region has dramatically increased since the 1990's and this has led to an increase of fertilizer consumption and, as a result, nitrate concentration. Therefore, the target of any management plan for groundwater quality on Jeiu Island needs to be focused on careful land use decisions in the mid-mountainous areas which are near Halla Mountain.
Keywords
Groundwater; quality trend; nitrate; chloride; Sen's method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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