Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study of Transient Estuarine Circulation in the Chunsu Bay, Yellow Sea: Impact of Freshwater Discharge by Artificial Dikes

  • Jeong, Kwang-Young (Ocean Research Division, Korea Hydrographic and Oceanographic Agency) ;
  • Ro, Young Jae (Department of Ocean Environmental Science, Chungnam National University) ;
  • Kang, Tae Soon (Department of Coastal Management, GeoSystem Research Corporation) ;
  • Choi, Yang Ho (Fisheries Resources and Environment Research Division, South Sea Fisheries Research Institute, NIFS) ;
  • Kim, Changsin (Fisheries Resources Management Division, National Institute of Fisheries Science) ;
  • Kim, Baek Jin (Department of Ocean Environmental Science, Chungnam National University)
  • Received : 2020.05.04
  • Accepted : 2020.05.28
  • Published : 2020.05.31
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Abstract

This study examined the ef ects of freshwater discharge by artificial dikes from the Kanwol and Bunam lakes on the dynamics in the Chunsu Bay, Yellow Sea, Korea, during the summer season based on three-dimensional numerical modeling experiments. Model performances were evaluated in terms of skill scores for tidal elevation, velocity, temperature, and salinity and these scores mostly exceeded 90 %. The variability in residual currents before and after the freshwater discharge was examined. The large amount of lake water discharge through artificial dikes may result in a dramatically changed density field in the Chunsu Bay, leading to an estuarine circulation system. The density-driven current formed as a result of the freshwater inflow through the artificial dikes (Kanwol/Bunam) caused a partial change in the tidal circulation and a change in the scale and location of paired residual eddies. The stratification formed by strengthened static stability following the freshwater discharge led to a dramatic increase in the Richardson number and lasted for a few weeks. The strong stratification suppressed the vertical flux and inhibited surface aerated water mixing with bottom water. This phenomenon would have direct and indirect impacts on the marine environment such as hypoxia/anoxia formation at the bottom.

Keywords

References

  1. Cai, S., Q. Huang, and X., Long(2003), Three-dimensional numerical model study of the residual current in the South China Sea, Oceanology Acta, Vol. 26(5), pp. 597-607. https://doi.org/10.1016/S0399-1784(03)00053-7
  2. Choi, Y. H.(2004), Development of water quality prediction model in Chunsu Bay, Ph.D. Thesis, Chungnam Nat'l Univ, pp. 1-132.
  3. Dube, S. K., A. D. Rao, P. C. Shinha, and L. Jain(1995), Implications of climatic variations in the fresh water outflow in the wind-induced circulation of the Bay of Bengal, Atmos Env, Vol. 29(16), pp. 2133-2138. https://doi.org/10.1016/1352-2310(94)00238-G
  4. Foreman, M. G. G., D. J. Stucchi, Y. Zhang, and A. M. Baptista(2006), Estuarine and tidal currents in the Broughton Archipelago, Atmosphere-Ocean, Vol. 44(1), pp. 47-63. https://doi.org/10.3137/ao.440104
  5. Friedrichs, C. T. and J. M. Hamrick(1996), Effects of channel geometry on cross sectional variations in along channel velocity in partially stratified estuaries, In buoyancy effects on coastal and estuarine dynamics (Aubrey DG, Friedrichs CT, eds) AGU, Vol. 53, pp. 283-300.
  6. Geyer, W. G.(1993), The importance of suppression of turbulence by stratification on the estuarine turbidity maximum, Estuaries, Vol. 16(1), pp. 113-125. https://doi.org/10.2307/1352769
  7. Goodrich, D., W. Boicourt, P. Hamilton, and D. Pritchard (1987), Wind-induced destratification in Chesapeake Bay, J Phys Oceanogr, Vol. 17, pp. 2232-2240. https://doi.org/10.1175/1520-0485(1987)017<2232:WIDICB>2.0.CO;2
  8. Guo, X. and A. Valle-Levinson(2008), Wind effects on the lateral structure of density-driven circulation in Chesapeake Bay, Cont Shelf Res, Vol. 28, pp. 2450-2471. https://doi.org/10.1016/j.csr.2008.06.008
  9. Imasato, N.(1983), What is tide-induced residual current?, J Phys Oceanogr, Vol. 13, pp. 1307-1317. https://doi.org/10.1175/1520-0485(1983)013<1307:WITIRC>2.0.CO;2
  10. Jung, K. Y. and Y. J. Ro(2010), Stratification and destratification processes in the Kangjin Bay, South Sea, Korea. J Korean Soc Oceanogr (The Sea), Vol. 15(3), pp. 97-109.
  11. Jung, K. Y., Y. J. Ro, and B. J. Kim(2013a), Tidal and sub-tidal current characteristics in the central part of Chunsu Bay, Yellow Sea, Korea during the summer season, J Korean Soc Oceanogr (The Sea), Vol. 18(2), pp. 53-64.
  12. Jung, K. Y., Y. J. Ro, and B. J. Kim(2013b), Characteristics of tidal current and tidal residual current in the Chunsu Bay, Yellow Sea, Korea based on numerical modeling experiments, Korean Soc Coast Ocean Eng, Vol. 25(4), pp. 207-218. https://doi.org/10.9765/KSCOE.2013.25.4.207
  13. Jung, K. Y., Y. J. Ro, B. J. Kim, and K. S. Park(2012), Model trajectory simulation for the behavior of the Namgang Dam water in the Kangjin Bay, South Sea, Korea, Korean Soc Coast Ocean Eng, Vol. 24(2), pp. 97-108. https://doi.org/10.9765/KSCOE.2012.24.2.097
  14. Jung, K. Y., Y. J. Ro, Y. H. Choi, and B. J. Kim(2015), Hypoxia in a transient estuary caused by summer lake-water discharge from artificial dikes into Chunsu Bay, Korea. Mar Pollut Bull, Vol. 95, pp. 47-62. https://doi.org/10.1016/j.marpolbul.2015.04.043
  15. Kashiwai, M.(1984), Tidal residual circulation produced by a tidal Vortex, Part1. Life-history of a tidal vortex, J Oceanogr Soc Japan, Vol. 40(6), pp. 279-294. https://doi.org/10.1007/BF02302521
  16. Lee, J. S., K. H. Kim, J. H. Sim, J. H. Han, Y. H. Choi, and B. J. Khang(2012), Massive sedimentation of fine sediment with organic matter and enhanced benthic-pelagic coupling by an artificial dike in semi-enclosed Chonsu Bay, Korea, Mar Pollut Bull, Vol. 64, pp. 153-163. https://doi.org/10.1016/j.marpolbul.2011.09.033
  17. Lee, T. W., H. T. Moon, and S. S. Choi(1997), Change in species composition of fish in Chonsu Bay (II) Surf zone fish, Korea J of Ichthyol, Vol. 9(1), pp. 79-90.
  18. Liu, W. C., W. B. Chen, and J. T. Kuo(2008), Modeling residence time response to freshwater discharge in a Mesotidal Estuary, Tiwan. J Marine Sys, Vol. 74(1-2), pp. 295-314. https://doi.org/10.1016/j.jmarsys.2008.01.001
  19. Martin, J. and S. C. McCutcheon(1999), Hydrodynamics and transport for water quality modeling. Lewis Publishers, pp. 1-794.
  20. Maze, R., G. Langlois, and F. Grosjean(1998), Tidal eulerian residual currents over a slope, analytical and numerical frictionless models, J Phys Oceanogr, Vol. 28, pp. 1321-1332. https://doi.org/10.1175/1520-0485(1998)028<1321:TERCOA>2.0.CO;2
  21. Park, K. and J. H. Oh(1998), Calibration and verification of a hydrodynamic model in Chunsu Bay and adjacent coastal water, J Korean Soc Coastal and Ocean Eng, Vol. 10(3), pp. 109-119.
  22. Peters, H.(1997), Observations of stratified turbulent mixing in an estuary: neap-to-spring variations during high river flow, Estuarine and Coastal Shelf Sci, Vol. 45, pp. 69-88. https://doi.org/10.1006/ecss.1996.0180
  23. Pritchard, D. W.(1952), Salinity distribution and circulation in the Chesapeak Bay eatuarine system, J Mar Res, Vol. 11, pp. 106-123. https://doi.org/10.2307/3151003
  24. Pritchard, D. W.(1954), A study of the salt balance in a coastal plain estuary, J Marine Res, Vol. 13, pp. 133-144.
  25. Pritchard, D. W.(1956), The dynamic structure of a coastal plain estuary, J Marine Res, Vol. 15, PP. 33-42.
  26. Ro, Y. J. and K. Y. Jung(2010), Impact of the dam water discharge on the circulation system in the Kangjin Bay, South Sea, Korea, Ocean Sci J, Vol. 45(1), pp. 7-25. https://doi.org/10.1007/s12601-010-0002-7
  27. Santoro, P., M. Fossati, and I. Piedra-Cueva(2013), Characterization of circulation patterns in Montevideo Bay (Uruguay), J Coastal Res, Vol. 29(4), pp. 819-835. https://doi.org/10.2112/JCOASTRES-D-11-00174.1
  28. Sharples, J., J. H. Simpson, and J. M. Brubaker(1994), Observations and modelling of periodic stratification in the upper York River estuary, Virginia, Estuarine, Coastal and Shelf Sci, Vol. 38, pp. 301-312. https://doi.org/10.1006/ecss.1994.1021
  29. Shin, Y. K., J. H. Sim, J. S. Jo, and Y. C. Park(1990), Relatively significance of nanoplankton in Chonsu Bay: species composition, abundance, chlorophyll and primary production, J Oceanological Soc Korea, Vol. 25, pp. 217-228.
  30. Signell, R. P. and C. K. Harris(2000), Modeling sand bank formation around tidal headlands, In: 6th International Conference of ASCE, New Orleans, LA, 3-5 Nov 1999, pp. 209-222.
  31. So, J. K., K. T. Jung, and W. C. Jang(1998), Numerical modeling of tides and tidal currents caused by embankment at Chunsu Bay, J Korean Soc of Coastal and Ocean Eng, Vol. 10(4), pp. 151-164.
  32. Turner, J. S.(1973), Buoyancy effects in fluids. Cambridge University Press, pp. 1-367.
  33. Uncles, R. J.(2002), Estuarine physical processes research: some recent studies and progress, Estuarine Coastal and Shelf Sci, Vol. 55, pp. 829-856. https://doi.org/10.1006/ecss.2002.1032
  34. Yoo, I. H.(1992), Numerical modeling of current and diffusion in Chunsu Bay, Master's Thesis, Chungnam Nat'l Univ, 64p.
  35. Zhai, L., J. Sheng, and R. J. Greatbatch(2008), Baroclinic dynamics of wind-driven circulation in a stratified bay: A numerical study using models of varying complexity, Cont Shelf Res, Vol. 28, pp. 2357-2370. https://doi.org/10.1016/j.csr.2008.05.005