Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Long-term Trend Analysis of Chlorophyll a and Water Quality in the Yeongsan River

통계적 경향 분석을 통한 영산강의 클로로필 a와 수질 변동 해석

  • Song, Eun-Sook (Coastal Estuarine Research Center, Mokpo National Maritime University) ;
  • Jeon, Song-Mi (Coastal Estuarine Research Center, Mokpo National Maritime University) ;
  • Lee, Eo-Jin (Department of Environmental Engineering and Biotechnology, Mokpo National Maritime University) ;
  • Park, Do-Jin (Department of Environmental Engineering and Biotechnology, Mokpo National Maritime University) ;
  • Shin, Yong-Sik (Coastal Estuarine Research Center, Mokpo National Maritime University)
  • 송은숙 (목포해양대학교 연안하구연구센터) ;
  • 전송미 (목포해양대학교 연안하구연구센터) ;
  • 이어진 (목포해양대학교 환경.생명공학과) ;
  • 박도진 (목포해양대학교 환경.생명공학과) ;
  • 신용식 (목포해양대학교 연안하구연구센터)
  • Received : 2012.05.30
  • Accepted : 2012.09.05
  • Published : 2012.09.30
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Abstract

Long-term trends (e.g. 1997~2010) of chlorophyll a and water quality properties of the Yeongsan River were analyzed by using water quality monitoring data collected by the water information system, ministry of environment. Nine monitoring stations were selected along the main channel of the river, and parameters of BOD, COD, TN, TP, conductivity, TSS and chlorophyll a were collected for surface water monthly through the monitoring system. Trends of water quality and chlorophyll a were analyzed by the Seasonal Mann-Kendall Test and LOWESS (Locally Weighted Scatter-plot Smoother). The results showed that the water quality parameters, including chlorophyll a, were improved in all stations except Station WC in the most-upper region, where water quality data for the determined parameters were increased, indicating a reduction in water quality. Based on the results from LOWESS analysis, chlorophyll a (algal blooms), BOD and COD recently began to increase after 2007 suggesting that an additional study on the cause of these increases in organic pollution, as well as a better management system for the region are required.

영산강을 대상으로 1992년부터 2009년까지 18년 동안 수집된 환경부 물환경정보시스템의 수질측정망 자료를 이용하여 수질 변동에 대한 장기적 경향을 통계 분석하였다. 영산강 본류에 위치한 9개 지점(우치, 광주1, 광주2, 광산, 나주, 영산포, 함평, 무안1, 무안2)에서 월별로 표층수에서 수질항목에 대해 측정하였고, 클로로필 a, 전기전도도, BOD, TN, TP 자료를 시계열 형태로 정리, 분석하였다. 경향분석은 MYSYSTAT 12 통계패키지를 이용하여 계절 맨-켄달 검정법과 LOWESS 검정법을 실시하였다. 경향분석 결과, 최상류 지점인 우치 정점에서 수질 항목들의 수치가 증가하는 것으로 나타났으나 나머지 정점에서는 전체적으로 클로로필 a와 더불어 수질이 개선되고 있는 것으로 확인되었다. 다만 클로로필 a (조류 발생), BOD, COD 등은 2007년 이후인 최근에 다시 수치가 증가하는 것으로 나타나 이에 대한 원인조사와 대책마련이 필요할 것으로 사료된다.

Keywords

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