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Runoff Characteristics of the Oedocheon Watershed in Jeju Island  

Ha, Kyoo-Chul (Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Moon, Deok-Cheol (Research Institute of Public Health & Envirionment, Jeju Special Self-Governing Province)
Koh, Ki-Won (Research Institute of Public Health & Envirionment, Jeju Special Self-Governing Province)
Park, Ki-Hwa (Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Journal of Soil and Groundwater Environment / v.13, no.5, 2008 , pp. 20-32 More about this Journal
Abstract
Runoff characteristics of the Oedocheon in Jeju island were investigated using the long-term stream stage monitoring data. At the Cheonah valley in the upstream area and Oedocheon downstream, annual runoff occurred 21 and 12 times, respectively, and their average runoff periods were 21 days and 12 days, respectively. Stream stage response time to rainfall was 4 hours, and storm-water transfer from the upstream, Cheonah valley, to the Oedocheon downstream took about 2 hours. The stream discharge measurements had been carried out from Feb. 2004 to Jul. 2005, and showed that normal discharge of the Oedocheon was 0.39 $m^3$/sec in average. Stage-discharge curves were developed to estimate base flow (normal discharge) and (direct) surface runoff. The base flow separations by a numerical filtering technique illustrated that annual surface runoff and base flow accounted respectively for 31.8${\sim}$36.5%, 63.5${\sim}$68.2% of the total stream discharge.
Keywords
Jeju island; Oedocheon; Runoff characteristics; Runoff frequency; Base flow separation;
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