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Pollutant Load Characteristics from a Small Mountainous Agricultural Watershed in the North Han River Basin

북한강 중류 산간농업 소하천에서의 오염부하특성분석

  • 신용철 (강원대학교 대학원 지역기반공학과) ;
  • 최중대 (강원대학교 농업공학부) ;
  • 임경재 (강원대학교 환경연구소) ;
  • 심혁호 (강원대학교 대학원 지역기반공학과) ;
  • 류창원 (강원대학교 대학원 지역기반공학과) ;
  • 양재의 (강원대학교 자원생물환경학과) ;
  • 유경열 (강원대학교 자원생물환경학과)
  • Published : 2005.11.01

Abstract

Natural environment of the Wolgokri stream watershed, located in Chuncheon, Gangwon province, Korea, has been well preserved as a traditional agricultural watershed. To analyze characteristics of NPS pollution generated from an mountainous agricultural watershed, the flow and water qualities of the study watershed were monitored and were analyzed to estimate pollution loads. Annual runoff volume ratio was $70.4\%$. Concentrations of T-N, T-p, COD, and TOC were higher when monthly rainfall was between $0\~30mm$ than those when monthly rainfall was between $30\~70mm$. However, the concentrations varied considerably when monthly rainfall was higher than 100mm. The flow weighted mean concentrations(mg/L) of BOD, COD, TOC, $NO_3-N$, T-N, T-P and SS were 1.96, 2.72, 3.32, 1.41, 4.70, 0.187 and 13.36, respectively. The BOD, SS, T-N and T-P loads of July, 2004 were $48\%,\;17\%,\;51\%\;and\;32\%$ of annual load, respectively. The BOD, COD, TOC, $NO_3-N$, T-N, T-p, and SS loads (kg/ha) from Mar. 2004 to Apr. 2005 were 19.09, 26.55, 32.39, 13.85, 45.92, 1.887 and 130.18, respectively. The highest concentrations of BOD, NO3-N, T-N, T-p, SS, COD and TOC were found before the flow reached the peak runoff, possibly due to the first flushing effect. Generally, pollution loads of the Wolgokri watershed were not that significant. Phosphorus load, however, was higher enough to cause eutrophication in the receiving water body It was recommended that best management practices need to be implemented to reduce phosphorus sources.

Keywords

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