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Estimation of Direct Runoff Variation According to Land Use Changes in Jeju Island  

Ha, Kyoo-Chul (Korea Institute of Geoscience and Mineral Resources)
Park, Won-Bae (Jeju Development Institute)
Moon, Deok-Cheol (Institute of Environmental Resources Research, Jeju Special Self-Governing Province)
Publication Information
Economic and Environmental Geology / v.42, no.4, 2009 , pp. 343-356 More about this Journal
Abstract
SCS method was applied to make the assessments of direct runoff according to land use changes in Jeju island. Land uses were obtained from 5 year-period remote sensing time series data from 1975 to 2000 which are provided by Water Management Information System (WAMIS). Hydrologic soil groups were categorized based on soil series of National Academy of Agricultural Sciences (NAAS), and permeable geologic structures such as Sumgol, Gotzawal and so on. The land uses of Jeju island are obviously characterized by urban-agricultural areas increases, and forest areas decrease. According to land use changes, curve number (CN) for Jeju island was consistently increased from 65.3 in 1975 to 69.6 in 2000. From 1975 to 2000, the amount of direct runoff and ratios increased due to CN changes. When the rainfall data in 1995 was applied to each year, the direct runoff amounts were $299.0{\sim}351.6\;mm$, and runoff ratios were $15.1{\sim}17.7%$. In the case of the application of the rainfall data in 2000, the direct runoff amounts were $136.9{\sim}161.5\;mm$, and runoff ratios were $9.7{\sim}11.5%$. Since direct runoff can be closely related to groundwater recharge and sustainable groundwater yield, the groundwater influence caused by land use changes or district exploitations should be considered for the reasonable water management and development in Jeju island.
Keywords
land use; direct runoff; SCS method; Jeju island;
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Times Cited By KSCI : 6  (Citation Analysis)
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