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Characteristics of Water Quality by Storm Runoffs from Intensive Highland Agriculture Area in the Upstream of Han River Basin  

Jung, Sungmin (Department Environmental Science, Kangwon National University)
Jang, Changwon (Department Environmental Science, Kangwon National University)
Kim, Jai-Ku (Department Environmental Science, Kangwon National University)
Kim, Bomchul (Department Environmental Science, Kangwon National University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.1, 2009 , pp. 102-111 More about this Journal
Abstract
Turbid storm runoff from intensive highland agriculture area has emerged as the major problem of water quality deterioration in the upstream region of the Han River. High slope of the upland combined with high rate of fertilization and intensive plowing causes high rate of soil erosion, and subsequently high suspended sediment and phosphorus content in the runoff water. The variations of water quality during rain spells were surveyed for two years (2005 and 2006) in the Jawoon Stream that is one of hot spots of intensive horticulture discharging turbid storm runoff. SS and TP showed large increase according to the increase of flow rate, whereas TN and BOD showed less fluctuations. Mean EMCs of SS and TP measured for nine rain events were as high as $207mgSS{\cdot}L^{-1}$ and $0.27mgP{\cdot}L^{-1}$, respectively. The export coefficient of SS and TP per area of cultivated field were calculated as $11,912kgSS{\cdot}yr^{-1}{\cdot}km^{-2}$ and $785kgP{\cdot}yr^{-1}{\cdot}km^{-2}$, repectively, which are significantly higher than reports of other area. It can be concluded that SS and TP in the runoffs were high enough to impose major threat to aquatic habitats, and the highland agriculture should be the main target of water quality management or habitat conservation in the study area.
Keywords
Event mean concentration (EMC); Export coefficient; High slope upland; Nonpoint pollutant;
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Times Cited By KSCI : 10  (Citation Analysis)
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