Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Characteristics of Non-point Pollutants Discharge in a Small Agricultural Watershed during Farming Season

영농기 농촌 소유역의 비점오염물질 유출 특성

  • Kim, Jin-Ho (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Lee, Jong-Sik (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Ryu, Jong-Su (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Lee, Kyung-Do (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Jung, Goo-Bok (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Kim, Won-Il (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Lee, Jeong-Taek (Div. of Environment & Ecology, National Institute of Agricultural Science and Technology, RDA) ;
  • Kwun, Soon-Kuk (Rural System Engineering, Seoul National University)
  • 김진호 (농업과학기술원 환경생태과) ;
  • 이종식 (농업과학기술원 환경생태과) ;
  • 류종수 (농업과학기술원 환경생태과) ;
  • 이경도 (농업과학기술원 환경생태과) ;
  • 정구복 (농업과학기술원 환경생태과) ;
  • 김원일 (농업과학기술원 환경생태과) ;
  • 이정택 (농업과학기술원 환경생태과) ;
  • 권순국 (서울대학교 지역시스템공학과)
  • Published : 2005.06.30
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Abstract

This study was conducted to identify the characteristics of non-point pollutants discharge in a small agricultural watershed during farming season. for this purpose, the Neoungchon watershed in Goesangun was selected as a typical agricultural area. Runoff and water quality data in the stream, the domestic sewage and the precipitation of the watershed were analyzed periodically from June 1 to November 6 in 2004 and pollutant loads were estimated. As a result the mean concentrations of BOD, SS, TN and TP in the stream were 3.0, 76.7, 8.7, 0.16 mg/L in rainy season and 2.4, 10.0, 3.5, 0.11 mg/L in dry season respectively. Daily discharge of non-point pollutant occurred above of 95% in rainy period. Measured pollutant loads in the watershed were $26.63kg/km^2/day$ of T-N and $0.62kg/km^2/day$ of T-P, within the range of other research results. Effluent loads based on guideline of total pollutant to stream management of MOE (Ministry of Environment) were less than delivery loads since the guideline could not reflect the agricultural practices, geomorphic and meteorological characteristics in an agricultural watershed.

괴산지역 내 소규모 농업유역을 대상으로 영농기 농촌 소유역에서 발생하는 비점오염 물질의 유출 특성을 조사하고자 소하천의 본류, 생활하수 유입하천 및 강수의 오염물질 농도와 하천 유량을 측정하여 오염부하를 계산하였다. 그 결과 영농기 동안 농촌유역 소하천 말단에서의 수질은 BOD의 경우 강우기 평균 3.0 mg/L, 평상시 평균 2.4 mg/L의 값을 보였으며, SS의 경우 강우기 평균 76.6 mg/L, 평상시 평균 10.9 mg/L을 나타냈으며, T-N과 T-P는 각각 강우기 평균 8.7, 0.16 mg/L, 평상시 3.5, 0.11 mg/L의 값을 나타내었다. 연구 기간 동안 측정한 수질 농도와 유량을 곱하여 부하로 계산한 결과 영농기에 유출되는 오염부하의 경우 95% 이상이 강우기에 유출되는 것으로 나타났으며, 연구기간 동안 유역 말단에서 측정된 오염물질의 부하량은 T-N의 경우 $26.63kg/km^2/day$, T-P의 경우 $0.62kg/km^2/day$의 값을 나타내어 기존 연구 결과의 범위 안에 있었다. 대상유역의 발생 및 배출 오염부하를 산정하기 위하여 환경부의 오염총량관리계획수립지침에 의거 계산한 배출부하량을 본 연구에서 실측한 유달부하량과 비교한 결과 유달율이 모든 수질 항목에서 100%를 넘는 것으로 나타나 영농기 농촌 소유역에 적용하여 오염부하를 평가하기에는 한계가 있을 것으로 판단된다. 향후 농촌 유역의 특성과 영농활동을 고려한 시기별 비점오염 물질의 유출 기작에 대한 연구가 더욱 진행되어야 할 것으로 판단된다.

Keywords

References

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  1. Monitoring of Hydrological and Water Quality in Dongjin-River Hengjeong Bridge Watershed for Agricultural Watershed Non-Point Pollutant Sources Management vol.54, pp.4, 2012, https://doi.org/10.5389/KSAE.2012.54.4.055
  2. Characteristics of TN and TP in Runoff from Reclaimed Paddy Field of Fine Sandy Loam vol.46, pp.6, 2013, https://doi.org/10.7745/KJSSF.2013.46.6.417