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Pollutants Removal Efficiency of Rainfall-runoff from Dense Highland Field Areas in Multistage Sedimentation Basins - Focused on Jaun Area in Upstream Watershed of Lake Soyang -

고랭지 밭 밀집지역 다단계 침사지의 강우-유출 오염물질 제거 효율 - 소양호 상류의 자운지구를 중심으로 -

  • Cho, Jae Heon (Department of Biosystems and Convergence Engineering, Catholic Kwandong University)
  • 조재현 (가톨릭관동대학교 바이오융합공학과)
  • Received : 2017.10.10
  • Accepted : 2018.03.19
  • Published : 2018.04.30

Abstract

Highland fields are concentrated in the Jaun area of Hongcheong-gun, a large amount of sediments are discharged from the highland fields. The sediment runoff affect the turbidity and water quality of the Soyang Lake, furthermore adversely affect water supply source of the capital region. There are several kinds of BMPs(Best management practices) to decrease the sedimentrunoff from the highland fields. Although construction cost of multistage sedimentation basins is very high, there is no actual survey data for the removal efficiency of suspended sediments and water quality in our country. In this study, stormwaterinflow and outflow of the multistage sedimentation basins were surveyed, and the removal efficiency of nonpoint source pollutants were analyzed. The stormwater survey results fortwo rainfall events show thatremoval efficiencies of SS, BOD and TP loads in the multistage sedimentation basins are 35%~62%, 24%~55%, 35%~58%, respectively. Although the measured efficiencies of the basins were lower than the theoretical efficiency, the proper operation and management can improve the removal rate of the basins. Turbid water problem in the upper parts of the Soyang River can be managed effectively through the additional installation of multistage sedimentation basins.

홍천군 내면 자운지구에는 고랭지 채소밭이 밀집되어 있어서 우기에는 고랭지 밭에서 많은 토사가 유출되어 소양호 탁도와 수질에 큰 영향을 미치고, 하류의 수도권 상수원에도 악영향을 준다. 본 연구에서는 고랭지밭 지역의 토사유출 저감을 위한 여러 BMPs 시설 중에서 많은 비용이 들지만 우리나라에서의 실측 조사 결과가 거의 없는 다단계 침사지에 대해서 강우시 유출입수를 실측 조사하고, 비점원오염물질 삭감효율을 분석하였다. 자운지구의 자운리 786번지와 자운리 628-2번지 다단계 침사지에서 2차례 강우에 대해서 침사지의 SS 제거효율을 분석한 결과 35%~62%의 삭감율을 보였다. BOD는 약 24%~55%, TP는 약 35%~58%의 오염부하가 삭감되었다. 이 지역 다단계 침사지의 실측 효율은 이론적인 효율보다 다소 낮지만 현재 설치되어 있는 침사지를 적절하게 관리하면 효율을 더 높일 수 있고, 추가적인 침사지 설치를 통해 흙탕물 관리를 효과적으로 할 수 있다.

Keywords

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