한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제34권4호
  • /
  • Pages.423-430
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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)
권호 표지
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보 건설 이후 영산강 보 구간에서의 질소계열 영양염류 및 식물플랑크톤 동태

Characteristics of Nitro-nutrients and Phytoplankton Dynamics in the Yeongsan River after Weir Construction

  • 서경애 (국립환경과학원 영산강물환경연구소) ;
  • 나정은 (국립환경과학원 영산강물환경연구소) ;
  • 류희성 (국립환경과학원 영산강물환경연구소) ;
  • 김경현 (국립환경과학원 영산강물환경연구소)
  • Seo, Kyung-Ae (Yeongsan River Environment Research Center, National Institute of Environmental Research) ;
  • Na, Jeong-Eun (Yeongsan River Environment Research Center, National Institute of Environmental Research) ;
  • Ryu, Hui-Seong (Yeongsan River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Kyunghyun (Yeongsan River Environment Research Center, National Institute of Environmental Research)
  • 투고 : 2018.04.19
  • 심사 : 2018.06.29
  • 발행 : 2018.07.30
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초록

Insomuch as it is important to manage water quality, from the perspective of water management, it is essential to understand the effect of the weirs on water quality and phytoplankton dynamics in various regions. The purpose of this study is to investigate the characteristics of nitro-nutrients, as well as occurrences and succession patterns of phytoplankton, in the river sections of the two weirs in the Yeongsan River for the five years (from 2012 to 2016) after the weir construction. In respect to this data, the average water temperature measured at the representative point in the section of the Seungchon Weir ($17.1^{\circ}C$) was higher than that of the Juksan Weir ($16.6^{\circ}C$) by comparison. By way of an analysis of this data, it was found that the water quality variables such as, organic matter, nitrogen nutrients and phosphorus nutrients were improved gradually during the period, but the degree of the improvement differs as noted and measured between the weirs. Under the circumstances, it is especially noted that the $NH_3-N$ concentration was higher for the point of the Seungchon Weir (2.204 mg/L) than that of the Juksan Weir (1.157 mg/L). This indicates that effluent as seen from sewage treatment plants and hydrological feature near the densely population area, could be the main cause for the incidence of water pollution in the upstream section of the Seungchon Weir. Additionally, the phytoplankton analysis showed that a relative abundance of diatoms and green algae were 56.9 % and 25.8 % respectively. However, it is noted that the cyanobacteria was measured lower as 10.7 %. Also, in the study sites cell density and occurrence frequency of cyanobacteria were relatively lower than compared to the same measurements noted in other rivers.

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