한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제34권6호
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  • Pages.632-641
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  • 2018
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  • 2289-0971(pISSN)
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  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
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수중 광량 모니터링을 통한 하절기 낙동강 본류 소광 특성 연구

A Study on the Light Extinction Characteristics in the Main Channel of Nakdong River by Monitoring Underwater Irradiance in Summer

  • 강미리 (국립환경과학원 물환경평가연구과) ;
  • 민중혁 (국립환경과학원 물환경평가연구과) ;
  • 최정규 (한국수자원공사 물환경처) ;
  • 박수영 (국립환경과학원 물환경평가연구과) ;
  • 신창민 (국립환경과학원 물환경평가연구과) ;
  • 공동수 (경기대학교 생명과학과) ;
  • 김한순 (경북대학교 생물학과)
  • Kang, Mi-Ri (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Min, Joong-Hyuk (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Choi, Jungkyu (Water Environmental Management Department, Korea Water Resources Corporation) ;
  • Park, Suyoung (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Shin, Changmin (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Kong, Dongsoo (Department of Bioconvergence, Kyonggi University) ;
  • Kim, Han Soon (Department of Biology, Kyungpook National University)
  • 투고 : 2018.10.08
  • 심사 : 2018.11.15
  • 발행 : 2018.11.30
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초록

Algal dynamics is controlled by multiple environmental factors such as flow dynamics, water temperature, trophic level, and irradiance. Underwater irradiance penetrating from the atmosphere is exponentially decreased in water column due to absorption and scattering by water molecule and suspended particles including phytoplankton. As the exponential decrease in underwater irradiance affects algal photosynthesis, regulating their spatial distribution, it is critical to understand the light extinction characteristics to find out the mechanisms of algal dynamics more systematically. Despite the significance, the recent data have been rarely reported in the main stream areas of large rivers, Korea. In this study, the euphotic depths and light extinction coefficients were determined by monitoring the vertical variation of underwater irradiance and water quality in the main channel of Nakdong River near Dodong Seowon once a week during summer of 2016. The average values of euphotic depth and light extinction coefficient were 4.0 m and $1.3m^{-1}$, respectively. The degree of light extinction increased in turbid water due to flooding, causing an approximate 50 % decrease in euphotic depth. Also, the impact was greater than the self-shading effect during the periods of cyanobacterial bloom. The individual light extinction coefficients for background, total suspended solid and algal levels, frequently used in surface water quality modeling, were determined as $0.305m^{-1}$, $0.090m^{-1}/mg{\cdot}L^{-1}$, $0.013m^{-1}/{\mu}g{\cdot}L^{-1}$, respectively. The values estimated in this study were within or close to the ranges reported in literatures.

키워드

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Fig. 1. Location maps showing the study area, including the monitoring stations.

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Fig. 2. Schematic diagrams showing key processes causing light attenuation at water surface layer and impact of light on photosynthesis in water column as a function of light attenuation (modified from Dodds and Whiles, 2010, Fig. 3.5).

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Fig. 3. Vertical variations of underwater irradiance and I/Io at HCUI-1 and HCUI-2. The black circles and horizontal bars represent the mean and standard deviation values at specific water depth, respectively.

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Fig. 4. Temporal variation of euphotic depths estimated at HCUI-1/2, including the related physico-chemical conditions such as stage, flow, wind speed, rainfall, thermal stratification, SS, Chl-a concentrations and Microcystis abundance.

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Fig. 5. Comparison between the observed and expected light extinction coefficients.

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Fig. 6. Comparison between the observed and modeled I/Io.

Table 1. Light extinction coefficients and euphotic depths estimated at HCUI-1 and HCUI-2

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Table 2. Temporal variations of light extinction coefficient with respect to changes in water environment

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Table 3. Light extinction coefficients for various river/shallow lake environments

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