Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Analysis of Flow Reversal by Tidal Elevation and Discharge Conditions in a Tidal River

감조하천에서 조위 및 유량조건에 따른 역류 분석

  • Song, Chang Geun (Department of Safety Engineering, Incheon National University) ;
  • Kim, Hyung-Jun (River and Coastal Research Division, Korea Institute of Civil Engineering and Building Technology) ;
  • Rhee, Dong Sop (River and Coastal Research Division, Korea Institute of Civil Engineering and Building Technology)
  • 송창근 (인천대학교 안전공학과) ;
  • 김형준 (한국건설기술연구원 하천.해안연구실) ;
  • 이동섭 (한국건설기술연구원 하천.해안연구실)
  • Received : 2014.01.06
  • Accepted : 2014.12.04
  • Published : 2014.12.31
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Abstract

The Han River is the only waterway in Korea where estuary is not blocked by dykes so that tidal water is flowing in and out through the tidal reach. The extreme tidal range in the Yellow Sea causes an intense flood current, stretching over horizontal extents of tens of kilometers into the rivers. To elucidate the flow reversal by discharge conditions and transient tidal level in the Han river, numerical simulations were conducted under 7 boundary conditions for two days with 10 minute time step. As the flow conditions changed from low discharge and high tidal difference to high discharge and low tidal difference, the flow reversals became weaker and the velocity of forward flow direction became higher due to the increased flow momentums and decreased tidal differences. In the case of normal flow, the maximum reverse velocity was 0.4 m/s, which was equivalent to the maximum forward velocity. In addition, the pattern of the development and decay of forward and reverse flow was presented.

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References

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