Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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A Study on the Sediment Flux in Gwangyang Bay during Spring Tide, March 2003

2003년 3월 대조기 광양만 부유퇴적물의 유 · 출입에 관한 연구

  • KIM Seok Yun (Department of Oceanography, Pukyong National University and Korea Inter-University Institute of Ocean Science) ;
  • LEE Byoung Kwan (Department of Oceanography, Pukyong National University and Korea Inter-University Institute of Ocean Science)
  • 김석윤 (부경대학교 해양학과 해양과학공동연구소) ;
  • 이병관 (부경대학교 해양학과 해양과학공동연구소)
  • Published : 2004.12.01
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Abstract

As a preliminary study on the sediment flux, concentrations of suspended particulate matter and current speeds were measured at three inlets of Gwangyang Bay during one tidal cycle of a spring tide of March 2003. The suspended sediment flux rate $(g/m^{2}/s)$ at the mouth of Seomjin River (St. K1) was observed to be higher throughout surface layer during ebb tide $(14.3\;g/m^{2}/s)$ and throughout near-bottom layer during the flood tide $(23.2\;g/m^{2}/s),$ resulting in a net upstream-ward transport of$0.9{\times}10^{3}kg/m$ during 13 period. At the inlet toward Yeosu Bay (St. K2), a relatively low rate ($(5.0-6.7\;g/m^{2}/s)$ of sediment flux occurred throughout the water column compared to St. K1, with a depth-integrated net transport of $5.6{\times}10^{3}kg/m$ toward the outer reaches of Gwangyang Bay inlet. At St. K3 located at Gwangyang Bay-side of Noryang Strait, the outward flux toward the Jinju Bay was observed to be dominant during the flood tide $(16.2-23.2\;g/m^{2}/s)$, especially through the mid and near bottom layer, compared to the inward flux throughout the whole water column during the ebb tide $(13.1-19.7\;g/m^{2}/s).$ The net transport at St. K3 was calculated to be $4.0{\times}10^{3}kg/m$ toward the outside of Gwangyang Bay. The outward net transport of suspended sediment at all three inlets seems to be consistent with a trend of bottom sediment texture, which suggests a net movement of sediment from a relatively coarse and poorly sorted inner-bay toward a relatively fine and better sorted outer-bay environment.

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References

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