Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Status and Causes of Cyanobacterial Blooming in the Downstream of Jecheon Stream

제천천 하류 지역에서 녹조 발생 현황 및 원인 분석

  • Yu-Ho Jeon (Department of Environmental Engineering, Chungbuk National University) ;
  • Do-Hwan Kim (Department of Environmental Engineering, Chungbuk National University) ;
  • Kyoung-Hee Oh (Department of Environmental Engineering, Chungbuk National University) ;
  • Young-Cheol Cho (Department of Environmental Engineering, Chungbuk National University)
  • 전유호 (충북대학교 공과대학 환경공학과) ;
  • 김도환 (충북대학교 공과대학 환경공학과) ;
  • 오경희 (충북대학교 공과대학 환경공학과) ;
  • 조영철 (충북대학교 공과대학 환경공학과)
  • Received : 2021.12.21
  • Accepted : 2022.06.21
  • Published : 2022.06.30
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Abstract

The occurrence of cyanobacterial blooming and the contaminant sources were analyzed in the downstream of Jecheon Stream, a tributary of Chungju Reservoir. The concentrations of chlorophyll a at the Myungseo Fishing Point (GPS; 37°03'25.5"N, 128°03'13.6"E) were 399.2 and 184.8 mg m-3 on October 18, 2015 and September 25, 2016, respectively, and the concentrations of total microcystins, a cyanobacterial toxin mainly produced by Microcystis, were 124.09 and 79.71 ㎍ L-1, respectively. The occurrence of cyanobacterial blooming at the downstream of Jecheon Stream was closely related to the water level of Chungju Reservoir. The cyanobacterial blooming occurred after the increase of water level in Chungju Reservoir, when the water body stagnated. As a result of analyzing National Water Quality Monitoring Data of the upper region of Jecheon Stream, the main source of pollutant was Jangpyeong Stream, the tributary of Jecheon Stream, and the discharge water from Jecheon Wastewater Treatment Plant located in Jangpyeong Stream was considered to be the most important source of contaminant.

충주호의 지류인 제천천 하류에서 주기적으로 발생하는 남조류 과다증식의 현황과 오염원을 분석하였다. 2015년 10월 18일과 2016년 9월 25일에 제천천 하류의 명서낚시터지점(GPS; 37°03'25.5"N, 128°03'13.6"E)에서 클로로필 a의 농도는 각각 399.2, 184.8 mg m-3이었으며, 남조류독소인 microcystins의 농도는 각각 124.09, 79.71 ㎍ L-1이었다. 명서낚시터 지점에서 남조류 과다증식은 충주호의 수위 및 수위변화와 매우 밀접한 관계가 있는 것으로 나타났다. 즉 수온이 남조류 성장에 적합한 조건에서 충주호 수위가 상승하여 수체가 정체되는 시기에 남조류 과다증식이 발생한다. 제천천에 위치한 환경부의 수질측정망 자료를 분석한 결과, 제천하수종말처리장이 위치한 장평천이 주요 오염 지류인 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 원주지방환경청과 한강수계관리위원회의 연구비 지원에 받아 수행된 연구입니다.

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