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2025 Vol.30, Issue 4 Preview Page

Article

Stability of Contaminated Sediments in an Urban Detention Basin: A Case Study from Yonghyeon Tidal Creek, Incheon

도심 유수지 내 오염퇴적물의 안정도: 인천 용현 갯골 사례

JAE HYEOK SHIN1
,
WOO JIN LEE1
,
SEONG WOON JEONG1
,
SU IN KIM1
,
CHAE YEON EUN1
,
HO KYUNG HA2*
신 재혁1
,
이 우진1
,
정 성운1
,
김 수인1
,
은 채연1
,
하 호경2*
1Graduate Student, Department of Ocean Sciences, Inha University, Incheon 22212, Korea
2Professor, Department of Ocean Sciences, Inha University, Incheon 22212, Korea
1인하대학교 해양과학과 대학원생
2인하대학교 해양과학과 교수
*Corresponding Author
30 November 2025. pp. 227-239
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Abstract

Detention basins are environments where cohesive sediments readily absorb and settle together with contaminants originating from urban areas. Consequently, understanding sediment erodibility is essential to assess the behavior and dispersion of accumulated contaminated sediments. This study collected sediment samples at the inner (YH1) and outer (YH2) parts of Yonghyeon tidal creek (Hagik detention basin) located in Incheon to evaluate sediment stability, and to analyze physicochemical properties and heavy metal concentrations of sediments in order to identify spatial variations. YH1 had finer median particle size (YH1: 22.1 μm, YH2: 31.8 μm) and higher organic matter content (YH1: 10.1%, YH2: 5.1%) than YH2. The sediment erodibility experiment showed a lower initial critical shear stress for erosion (YH1: 0.13 Pa, YH2: 0.19 Pa) and a higher cumulative eroded mass (YH1: 121.3 g/m², YH2: 67.6 g/m²) at YH1 compared to YH2. At YH1, weakened current velocity caused by artificial island and continuous organic matter inputs from the sewage outfall reduced the consolidation of fine-grained sediments, resulting in lower sediment stability. At YH2, intermittent strengthened current velocity during the drainage gate opening led to the dominance of coarse sediments, resulting in higher sediment stability. Furthermore, heavy metal concentrations at YH1 were higher than YH2, with Cu, Ni, and Zn exceeding the NOAA Effect Range-Low thresholds by approximately 1.5, 1.1, and 2 times, respectively. Due to the more cohesive sediments at YH1 compared to YH2, contaminants were more readily absorbed from the sewage outfall and more easily released into the external environment through sediment erosion. Because inflows from the tidal creek can affect water circulation in the adjacent harbor, this study evaluated the erosion mechanisms of contaminated sediments and their potential dispersion by investigating sediment stability and contaminant characteristics within a contaminated urban detention basin.

Keywords
Detention basin
Artificial structure
Sediment stability
Critical shear stress for erosion

유수지는 점착성 퇴적물이 도심으로부터 유입된 오염물질과 함께 흡착되어 침전되기 쉬운 환경이다. 축적된 오염퇴적물의 거동 및 확산을 평가하기 위해서는 퇴적물 안정도를 파악할 필요가 있다. 본 연구는 인천광역시에 위치한 용현 갯골(학익유수지)에서 유수지 내측(YH1)과 외측(YH2)의 퇴적물 시료를 획득하여, 퇴적물 안정도를 평가하고, 퇴적물의 물성과 중금속 농도를 분석하여, 공간적 차이를 규명하는 것을 목적으로 한다. 분석 결과, YH1 정점이 YH2 정점보다 중앙입도(YH1: 22.1 μm, YH2: 31.8 μm)가 더 세립하였으며, 유기물 함량(YH1: 10.1%, YH2: 5.1%)이 더 높았다. 퇴적물 침식률 실험 결과, YH1 정점이 YH2 정점보다 최초침식한계전단응력(YH1: 0.13 Pa, YH2: 0.19 Pa)이 더 낮고, 침식된 누적 퇴적물량(YH1: 121.3 g/m2, YH2: 67.6 g/m2)이 더 높았다. YH1 정점은 인공섬의 영향으로 유속이 약하고, 인근 하수관으로부터 지속적인 유기물 유입으로 인해, 세립질 퇴적물의 압밀이 약화되어 퇴적물 안정도가 상대적으로 낮게 나타난 것으로 보인다. YH2 정점은 배수문 개방 시, 간헐적으로 발생하는 강한 유속에 의해 조립질 퇴적물이 더 우세하게 분포하여, 퇴적물 안정도가 높게 나타난 것으로 해석된다. 또한, YH1 정점은 YH2 정점에 비해 중금속 농도가 높았으며, 구리, 니켈, 아연은 각각 NOAA에서 제시한 Effect Range-Low 기준치 대비 약 1.5배, 1.1배, 2배 이상 초과하였다. 이는 YH1 정점의 퇴적물이 YH2 정점보다 점착성이 높아, 인근 도시 하수관으로부터 유입된 오염물질이 상대적으로 잘 흡착되며, 침식에 의해 외부로 쉽게 유출될 수 있음을 보여준다. 갯골에서 유입된 물질은 인근 항만의 해수 순환에 영향을 미칠 수 있으므로, 본 연구는 오염된 도심 유수지에서 퇴적물 안정도와 오염물질 특성에 대한 규명을 통해 오염퇴적물의 침식 기작 및 확산 가능성을 평가하였다.

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Information
  • Publisher :The Korean Society of Oceanography
  • Publisher(Ko) :한국해양학회
  • Journal Title :The Sea Journal of the Korean Society of Oceanography
  • Journal Title(Ko) :한국해양학회지 바다
  • Volume : 30
  • No :4
  • Pages :227-239
  • Received Date : 2025-10-01
  • Revised Date : 2025-11-23
  • Accepted Date : 2025-11-25
  • DOI :https://doi.org/10.7850/jkso.2025.30.4.227
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