Numerical study on tidal currents and seawater exchange in the Benoa Bay, Bali, Indonesia
doi: 10.1007/s13131-014-0434-5
Numerical study on tidal currents and seawater exchange in the Benoa Bay, Bali, Indonesia
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摘要: A three-dimensional (3-D) finite volume coastal ocean model (FVCOM) was used for the study of water circulation and seawater exchange in the Benoa Bay, Bali Island. The M2 tidal component was forced in open boundary and discharge from six rivers was included in the numerical calculation. The M2 tidal elevation produced by the FVCOM has a good agreement with the observation data. The M2 tidal current is also successfully calculated under the ebb tide and flood tide conditions. The non-linear M2 tidal residual current was produced by the coastline geometry, especially surrounding the narrow strait between the Serangan Island and the Benoa Peninsula. The tidal residual current also generated two small eddies within the bay and one small eddy in the bay mouth. The salinity distribution influenced by river discharge could be successfully calculated, where the numerical calculation and the observation results have a good correlation (r2) of 0.75. Finally in order to examine the seawater exchange in the Benoa Bay, the Lagrangian particle tracking method and calculation of residence time are applied. The mechanism of particle transport to the flushing of seawater is depicted clearly by both methods.
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关键词:
- FVCOM /
- M2tidalcurrent /
- M2residualcurrent /
- salinity /
- seawaterexchange
Abstract: A three-dimensional (3-D) finite volume coastal ocean model (FVCOM) was used for the study of water circulation and seawater exchange in the Benoa Bay, Bali Island. The M2 tidal component was forced in open boundary and discharge from six rivers was included in the numerical calculation. The M2 tidal elevation produced by the FVCOM has a good agreement with the observation data. The M2 tidal current is also successfully calculated under the ebb tide and flood tide conditions. The non-linear M2 tidal residual current was produced by the coastline geometry, especially surrounding the narrow strait between the Serangan Island and the Benoa Peninsula. The tidal residual current also generated two small eddies within the bay and one small eddy in the bay mouth. The salinity distribution influenced by river discharge could be successfully calculated, where the numerical calculation and the observation results have a good correlation (r2) of 0.75. Finally in order to examine the seawater exchange in the Benoa Bay, the Lagrangian particle tracking method and calculation of residence time are applied. The mechanism of particle transport to the flushing of seawater is depicted clearly by both methods.-
Key words:
- FVCOM /
- M2 tidal current /
- M2 residual current /
- salinity /
- seawater exchange
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Awaji T, Imasato N, Kunishi H. 1980. Tidal exchange through a strait: a numerical experiment using a simple model basin. Journal of Physical Oceanography, 10: 1499-1508 Bilgili A, Proehl J A, Lynch D R, et al. 2005. Estuary/ocean exchange and tidal mixing in Gulf of Maine Estuary: A Langrangian modeling study. Estuarine, Coastal and Self science, 65: 607-624 Chen Changsheng, Beardsley R C, Cowles G. 2006. An unstructured grid, finite-volume coastal ocean model (FVCOM) user manual. SMAST/UMASSD Chen Changsheng, Liu Hedong, Beardsley R C. 2003. An unstructured grid, finite-volume, three-dimensional, primitive equations ocean model: application to coastal ocean and estuaries. Journal of Atmospheric and Oceanic Technology, 20: 159-186 Chen Changsheng, Xue Pengfei, Ding Pingxing, et al. 2008. Physical mechanism for offshore detachment of the Changjiang diluted water in the East China Sea. Journal of Geophysical Research, 113: 1-17 Galperin, B, Kantha L H, Hassid S, et al. 1988. A quasi-equilibrium turbulent energy model for geophysical flows. Journal of the Atmospheric Sciences, 45: 55-62 Huang Haosheng, Chen Changsheng, Blanton J O, et al. 2008. A numerical study of tidal asymmetry in Okatee Creek, South Carolina. Estuarine, Coastal and Shelf Science, 78: 190-202 Imasato N, Awaji T, Kunishi H. 1980. Tidal exchange through Naruto, Akashi and Kitan Straits. Journal of the Oceanographical Society of Japan, 36: 151-162 Imasato N. 1983. What is tide-induced residual current? Journal of Physical Oceanography, 13: 1307-1317 Matsumoto K, Ooe M, Sato T, et al. 1995. Ocean tide model obtained from TOPEX/POSEIDON altimetry data. Journal of Geophysical Research, 100: 25319-25330 Lu Sun, Quanan Zheng, Wang Dongxiao, et al. 2011. A case study of near-inertial oscillation in the South China Sea using mooring observations and satellite altimeter data. Journal of Oceanography, 67: 677-687 Lu Sun, Zheng Quanan, Tang Tswen Yung, et al. 2012. Upper ocean near-inertial response to 1998 Typhoon Faith in the South China Sea. Acta Oceanologica Sinica, 31: 25-32 Yanagi T. 1976. Fundamental study on the tidal residual current-Ⅰ. Journal of the Oceanographical Society of Japan, 32: 199-208 Yasuda H. 1980. Generating mechanism of the tidal residual current due to the coastal boundary layer. Journal of the Oceanographical Society of Japan, 35: 241-252 Zhou Wei, Lin Luo, Xu Hongzhou, et al. 2012. Saltwater intrusion in the Pearl River Estuary during winter. Aquatic Ecosystem Health & Management Volume, 15: 70-80
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