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Effects of Short Time Variation in the River Discharge on the Salt Wedge Intrusion in the Yura Estuary, a Micro Tidal Estuary, Japan

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DOI: 10.4236/jwarp.2013.53A035    4,123 Downloads   6,536 Views   Citations

ABSTRACT

A numerical model was developed to investigate salinity distribution in the Yura Estuary, a micro tidal estuary in Japan. The model results show that the salinity distribution as represented by salt wedge intrusion agreed well with field observations. In addition to the seasonal variation, the salt wedge responds over short time scales according to the flood events. The retreat of the salt wedge is dependent on the scale of the river discharge; the salt wedge moved back and disappeared from the estuary when over250 m3·s-1 of fresh water was discharged from the estuary and it takes ~11 days for salt wedge to recover from the fresh water discharge event. The Yura Estuary has on average three floods during summer, this coincides with when phytoplankton is most productive in the river and indicates that the short temporal variations in the river discharge has important effects not only on the hydrodynamics, but also on the ecosystem in the estuary.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

T. Funahashi, A. Kasai, M. Ueno and Y. Yamashita, "Effects of Short Time Variation in the River Discharge on the Salt Wedge Intrusion in the Yura Estuary, a Micro Tidal Estuary, Japan," Journal of Water Resource and Protection, Vol. 5 No. 3A, 2013, pp. 343-348. doi: 10.4236/jwarp.2013.53A035.

References

[1] K. R. Dyer, “Estuaries, a Physical Introduction,” 2nd Edition, John Wiley & Sons Ltd., Hoboken, 1997.
[2] D. A. Jay and J. Dungan Smith, “Circulation, Density Distribution and Neap-Spring Transitions in the Columbia River Estuary,” Progress in Oceanography, Vol. 25, No. 1-4, 1990, pp. 81-112. doi:10.1016/0079-6611(90)90004-L
[3] C. Ibanez, D. Pont and N. Part, “Characterization of the Ebre and Rhone estuaries: A Basis for Defining and Classifying Salt-Wedge Estuaries,” Limnology and Oceanography, Vol. 42, No. 1, 1997, pp. 89-101. doi:10.4319/lo.1997.42.1.0089
[4] H. H. S. Savenije, “Predictive Model for Salt Intrusion in Estuaries,” Journal of Hydrology, Vol. 148, No. 1-4, 1993, pp. 203-218. doi:10.1016/0022-1694(93)90260-G
[5] J. P. Sierra, A. Sánchez-arcilla, P. A. Figueras, J. González Del Río, E. K. Rassmussen, C. Mosso, “Effects of Discharge Reductions on Salt Wedge Dynamics of the Ebro River,” River Research and Applications, Vol. 20, No. 1, 2004, pp. 61-77. doi:10.1002/rra.721?
[6] S. Unoki, “The Science of Flow System,” Tsukiji Shokan Publishing, Tokyo, 2010, p. 99.
[7] A. Kasai, Y. Kurikawa, M. Ueno, D. Rober and Y. Yamashita, “Salt-Wedge Intrusion of Seawater and Its Implication for Phytoplankton Dynamics in the Yura Estuary, Japan,” Estuarine, Coastal and Shelf Science, Vol. 86, No. 3, 2010, pp. 408-414. doi:10.1016/j.ecss.2009.06.001
[8] Delft Hydraulics, “Delft3D-FLOW User Manual Version 3.14,” Delft, 2007.
[9] K. Harambidou, G. Sylaios and V. A. Tsihrintzis, “Salt-Wedge Propagation in a Mediterranean Micro-Tidal River Mouth,” Estuarine, Coastal and Shelf Science, Vol. 90, No. 4, 2010, pp. 174-184. doi:10.1016/j.ecss.2010.08.010
[10] R. J. Uncles and J. A. Stephens, “Salt Intrusion in the Tweed Estuary,” Estuarine, Coastal and Shelf Science, Vol. 43, No. 3, 1996, pp. 271-293. doi:10.1006/ecss.1996.0070
[11] S. Fukuoka, H. Shimamura, Y. Kajiya, A. Takahashi and K. Okada, “Field Study of Salt Intrusion in Naka River,” Proceedings of the Japanese Conference on Hydraulics, Vol. 32, No. 1, 1988, pp. 203-208.
[12] P. A. Thompson, “Spatial and Temporal Patterns of Factors Influencing Phytoplankton in a Salt wedge Estuary, the Swan River, Western Australia,” Estuaries, Vol. 21, No. 4, 1998, pp. 801-817. doi:10.2307/1353282

  
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