생태와환경 (Korean Journal of Ecology and Environment)

  • 제52권4호
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  • Pages.316-323
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  • 2019
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  • 2288-1115(pISSN)
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  • 2288-1123(eISSN)
한국수생태학회 (The Korean Society of Limnology)
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낙동강 수계의 유역환경 변화에 따른 퇴적환경 특성

A Study on the Characteristics of River Sediments in Watershed Environment of Nakdong River

  • 이권철 (국립환경과학원 낙동강물환경연구소) ;
  • 김신 (국립환경과학원 낙동강물환경연구소) ;
  • 양득석 (국립환경과학원 낙동강물환경연구소) ;
  • 박수정 (국립환경과학원 낙동강물환경연구소) ;
  • 정현기 (국립환경과학원 낙동강물환경연구소) ;
  • 이규열 (낙동강유역환경청)
  • Lee, Kwonchul (National Institute of Environmental Research, Nakdong River Environmental Research Center) ;
  • Kim, Shin (National Institute of Environmental Research, Nakdong River Environmental Research Center) ;
  • Yang, Deukseok (National Institute of Environmental Research, Nakdong River Environmental Research Center) ;
  • Park, Soojung (National Institute of Environmental Research, Nakdong River Environmental Research Center) ;
  • Jeong, Hyungi (National Institute of Environmental Research, Nakdong River Environmental Research Center) ;
  • Lee, Kyuyeol (Nakdong River Basin Environmental Office)
  • 투고 : 2019.10.14
  • 심사 : 2019.12.07
  • 발행 : 2019.12.31
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초록

본 연구에서는 낙동강 수계에서 강우, 유량 등 유역환경의 변화가 퇴적환경 특성에 미치는 영향을 알아보았다. 강정고령보의 상류 구간에서 장마 기간 이후 퇴적물의 입도분포가 세립해지며, 유기물질 및 영양염류의 농도가 다소 증가하는 경향이 나타났다. 장마 기간 동안 증가한 유량에 의해 부유물질, 유기물질 등이 공급된 후 인공구조물로 인한 유수의 일시적인 정체로 퇴적이 진행된 것으로 판단된다. 본 연구의 결과가 낙동강 수계 모든 지역의 퇴적환경을 지시할 수는 없지만 보와 같은 인공구조물이 설치된 지역 인접한 구간에서의 퇴적물 성상 변화를 이해하는 자료로서 활용이 가능할 것으로 생각된다. 또한, 변화하는 수계의 환경에 따라 퇴적물 내의 유기물 및 영양염류 등이 수계에서 내부오염원으로 작용하지 않도록 향후 지속적인 모니터링과 연구가 이루어져야 할 것으로 사료된다.

This study was carried out to investigate sedimentary environment changes in Nakdong River sediments. For this purpose, sediments at six sites upstream of Gangjeong-Goryung Weir in the middle of the Nakdong River were collected before and after the rainy season. Particles size, IL, TOC, TN, TP, and SRP were analyzed for the sediment environment. The changes in the watershed environment before and after the rainy season (precipitation, discharge, and SS concentration) were investigated. After the rainy season, the amount of precipitation and discharge increased more than three times, and the average concentration of SS in the stream increased more than two times. Fine grained sediment and the concentrations of IL, TOC, TN, TP, SRP were increased after the rainy season. As a result of sediment contamination assessment, IL was 19~68% of the reference value, TN and TP were 21~76% and 21~58% of the reference value. The result showed strong correlation between particle size (Silt+Clay) and organic contents of sediment (IL, TOC, TN, TP and SRP). It is considered that the change of the river watershed environment (precipitation, discharge) is an important factor of the change of sedimentation environment.

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