Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Characteristics of Water Quality by Storm Runoffs from Intensive Highland Agriculture Area in the Upstream of Han River Basin

한강상류 고령지 농업지역에서의 강우시 비점오염 유출 특성

  • 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)
  • 정성민 (강원대학교 자연과학대학 환경과학과) ;
  • 장창원 (강원대학교 자연과학대학 환경과학과) ;
  • 김재구 (강원대학교 자연과학대학 환경과학과) ;
  • 김범철 (강원대학교 자연과학대학 환경과학과)
  • Received : 2008.09.09
  • Accepted : 2008.12.19
  • Published : 2009.01.30
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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

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