인공보의 어류생태영향 평가를 위한 Echo-sounder 모니터링 기법 적용
분야
공학 > 환경공학
저자
한정호 ( Jeong Ho Han ) , 이재훈 ( Jae Hoon Lee ) , 최지웅 ( Ji Woong Choi ) , 임병진 ( Byung Jin Lim ) , 박종환 ( Jong Hwan Park ) , 안광국 ( Kwang Guk An )
발행기관
한국환경영향평가학회
간행물정보
환경영향평가 2012년, 제21권 제6호, 859~877페이지(총19페이지)
파일형식
23301098.pdf [무료 PDF 뷰어 다운로드]
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    영문초록
    In this study, Echo-sounder(Es) monitoring methodology was applied to test environmental impacts of artificial weirs(SCW and JSW) in the Yeongsan River on fish community and habitat structures at first time, and was compared with conventional fish sampling methodologies(Cs). For the Es monitoring in the fields, parallel transect methods was employed in determining the survey distance interval with every 125 m within the upper-lower 2 km of the weirs. Four different fish sampling gears such as casting nets, kick nets, fyke nets, and gill nets were used for applications of Cs monitoring methodology. According to the Echo-sounder monitoring, fish density, expressed as a number of individuals per square meter, along the longitudinal axis of the weir was significantly greater(JSW, t = 3.506, n = 30, p < 0.001) in the down-river reach of the weir than in the up-river reach. Also, fish density along the vertical water column was highest at mid-depths of Seungchon weir, which has simple habitat substrates, while fish density was highest at hypolimnetic depth of Juksan weir. According to fish sampling by the Cs methodology, the fish compositions decreased as the river goes upward, and significant differences(JSW, t = 0.248, n = 30, p < 0.05) in the compositions of fish species occurred between up-reach and down-reach of the weirs. The dominant species near the two weirs were Opsarichthys uncirostris amurensis, Hemiculter eigenmanni and Coilia nasus. Overall, our fish and habitat data, based on Es and Cs monitoring methodologies, suggest that the weirs disturbed the rivers due to initial habitat disturbances by the weir constructions as well as the barrier roles of weirs on fish passage and migrations. More long-term scientific and systematic fish impact monitoring and assessments(Es and Cs) are required in the future to predict changes of ecological structures and functions on the constructions of the weirs.
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