Abstract
Based on the analysis of the advantages and disadvantages of some vertical coordinates applied in the calculation of the Changjiang diluted water (CDW), a new hybrid vertical coordinate is designed, which uses σ coordinate for current and σ-z coordinate for salinity. To combine the current and salinity, the Eulerian-Lagrangian method is used for the salinity calculation, and the baroclinic pressure gradient (BPG) is calculated on the salinity sited layers. The new hybrid vertical coordinate is introduced to the widely used model of POM (Princeton Ocean Model) to make a new model of POM-σ-z. The BPG calculations of an ideal case show that POM-σ-z model brings smaller error than POM model does. The simulations of CDW also show that POM-σ-z model is better than POM model on simulating the salinity and its front.
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References
Backhaus, J. O., 1985. A three-dimensional model for the simulation of shelf sea dynamics, Deutsche Hydrographische Zeitschrift, 38(4): 165–187.
Bleck, R., 2002. An oceanic general circulation model framed in hybrid isopycnic-Cartesian coordinates, Ocean Model., 4(1): 55–88.
Blumberg, A. F. and Mellor, G. L., 1987. A description of a three dimensional coastal ocean circulation model, in: Heaps N. (Ed.), Three-dimensional Coastal Ocean Models, Coastal and Estuarine Sciences, Washington: American Geophysical Union, 4, 1–16.
Casulli, V. and Zanolli, P., 1998. A three-dimensional semi-implicit algorithm for environmental flows on unstructured grids, Proc. of Conf. on Num. Methods for Fluid Dynamics, University of Oxford.
Chen, C. S., Liu, H. D. and Beardsley, R. C., 2003. An unstructured grid, finite-volume, three-dimensional, primitive equations ocean model: application to coastal ocean and estuaries, J. Atmos. Oceanic Technol., 20(1): 159–186.
Chen, C. S., Xue, P. F. and Ding, P. X. et al., 2008. Physical mechanisms for the offshore detachment of the Changjiang Diluted Water in the East China Sea, J. Geophys. Res., 113, C02002, doi: 10.1029/2006JC003994.
Delft Hydraulics, 1999. Delft3D-FLOW User Manual, Netherlands: Delft Hydraulics.
Ezer, T. and Mellor, G. L., 2004. A generalized coordinate ocean model and a comparison of the bottom boundary layer dynamics in terrain-following and in z-level grids, Ocean Model., 6(3): 379–403.
Marine atlas editorial board, 1992. Marine atlas of Bohai Sea, Yellow Sea and East China Sea (Hydrology), China Ocean Press. (in Chinese)
Martin, P. J., 2000. A Description of the Navy Coastal Ocean Model, Version 1.0, NRL Report: NRL/FR/7322-00-9962, NRL, Stennis Space Center, MS, 39.
Mask, A. C. and Preller, R. H., 2007. A numerical simulation of the East Asian Seas in March 2002: Effect of vertical grid choice, Ocean Model., 18(2): 81–96.
Mellor, G. L., Ezer, T. and Oey, L. Y., 1994. The pressure gradient conundrum of sigma coordinate ocean models, J. Atmos. Oceanic Technol., 11(4): 1126–1134.
Shchepetkin, A. F. and Mcwilliams, J. C., 2005. The regional oceanic modeling system (ROMS): A split-explicit, free-surface, topography-following-coordinate oceanic model, Ocean Model., 9(4): 347–404.
Shen, H. T., Zhu, H. and Mao, Z. C., 1986. The circumfluence of the Changjiang River Estuary and its effect on the transport of suspended sediment, Oceanologia et Limnologia Sinica, 17(1): 26–35. (in Chinese)
Wu, H. and Zhu, J. R., 2007. Analysis of the transport mechanism of the saltwater spilling over from the North Branch in the Changjiang Estuary in China, Acta Oceanologica Sinica, 29(1): 17–25. (in Chinese)
Zhang, Y. L. and Baptista, A. M., 2008. SELFE: A semi-implicit Eulerian-Lagrangian finite-element model for cross-scale ocean circulation, Ocean Model., 21(3–4): 71–96.
Zhang, Y. L., Baptista, A. M. and Myers, E. P., 2004. A cross-scale model for 3D baroclinic circulation in estuary-plume-shelf systems: I. Formulation and skill assessment, Cont. Shelf Res., 24(18): 2187–2214.
Zhao, B. and Fang, G., 1991. Flux evaluation for the main channels of the East China Sea, Acta Oceanologica Sinica, 13(2): 169–178.
Zhu, J. R., Ding, P. X. and Hu, D. X., 2003. Observation of the diluted water and plume front off the Changjiang River Estuary during August 2000, Oceanologia et Limnologia Sinica, 34(3): 249–255. (in Chinese)
Zhu, J. R., Wu, H., Zhang, H. and **ao, C. Y., 2004. The open boundary condition study for the circumfluent model of the East Sea and the Yellow Sea including the effect of tidal current, Progress in Nature Science, 14(6): 689–693. (in Chinese)
Zhu, S. X., 2005. Current, Wave Models and Long-Term Mass Transport Separation Study, Ph. D. Thesis, East China Normal University. (in Chinese)
Zhu, S. X., Ding, P. X., Sha, W. Y., Ma, M. and Zhang, W. J., 2001. New Eulerian-Lagrangian method for salinity’s calculation, China Ocean Eng., 15(4): 553–564.
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Zhang, Wj., Zhu, Sx., Dong, Lx. et al. A new hybrid vertical coordinate ocean model and its application in the simulation of the Changjiang diluted water. China Ocean Eng 25, 327–338 (2011). https://doi.org/10.1007/s13344-011-0027-4
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DOI: https://doi.org/10.1007/s13344-011-0027-4