한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제40권2호
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  • Pages.79-88
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  • 2024
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  • 2289-0971(pISSN)
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  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
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하천 수문 특성과 유기물 성상 변화에 따른 하상 유동상 퇴적물 거동 연구

Formation and Deformation of the Fluid Mud Layer on Riverbeds under the Influence of the Hydrological Property and Organic Matter Composition

  • 트렁 틴 휜 (경북대학교 미래과학기술융합학과) ;
  • 허진 (세종대학교 환경에너지공간융합학과) ;
  • 이병준 (경북대학교 미래과학기술융합학과)
  • Trung Tin Huynh (Department of Advanced Science and Technology Convergence, Kyungpook National University) ;
  • Jin Hur (Department of Engineering Environment, Energy and Geoinformatics, Sejong University) ;
  • Byung Joon Lee (Department of Advanced Science and Technology Convergence, Kyungpook National University)
  • 투고 : 2023.11.15
  • 심사 : 2024.02.27
  • 발행 : 2024.03.30
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초록

This study employed field measurements and biogeochemical analysis to examine the effects of seasonal conditions (e.g., temperature and precipitation) and human intervention (e.g., dam or weir construction) on the chemical composition of dissolved organic matter, flocculation kinetics of suspended particulate matter, and formation of the fluid mud layer on riverbeds. The results indicated that a water environment with a substantial amount of biopolymers offered favorable conditions for flocculation kinetics during an algal bloom period in summer; a thick fluid mud layer was found to be predominated with cohesive materials during this period. However, after high rainfall, a substantial influx of terrigenous humic substances led to enhanced stabilization of the particulate matter, thereby decreasing flocculation and deposition, and the reduced biopolymer composition served to weaken the erosion resistance of the fluid mud on the riverbed. Moreover, a high-turbulence condition disaggregated the flocs and the fluid mud layer and resuspended the suspended particulate matter in the water column. This study demonstrates the mutual relationship that exists between biogeochemistry, flocculation kinetics, and the formation of the fluid mud layer on the riverine area during different seasons and under varying hydrological conditions. These findings are expected to eventually help inform the more optimal management of water resources, which is an urgent task in the face of anthropogenic stressors and climate change.

키워드

과제정보

We acknowledge the financial support by the National Research Foundation of Korea (Grant No. NRF-2020R1I1A3A04036895).

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