The principal character of the tidal exchange process is neither diffusion nor advection, but a third category of transport, “Massenaustausch”, which appears in the space/time averaged transport. The exchange process can be divided into four fluxes: the flux of standing eddies, the flux of tidal exchange, the flux of tidal eddies and the flux of local eddies. The results of observations at the entrance channel of Kumihama-Bay show a typical example of transport dominated by tidal exchange.
The tidal exchange ratio defined by Parkeret al. (1972) applies to the process of exchange between the outflowing watermass and the surrounding watermass outside of the bay mouth, but this should also be considered as being coupled with the ratio for the process of exchange between the inflowing watermass and the surrounding watermass inside of the bay mouth. These two exchange ratios can be combined into a single exchange ratio which describes the exchange process between the outer watermass and the bay water.
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Dyer, K. R. (1973): Estuaries: A Physical Introduction. John Wiley & Sons, 140 pp.
Dyer, K. R. (1974): The salt balance in stratified estuaries. Estuarine Coast. Mar. Sci.,2, 273–281.
Fischer, H. B. (1972): Mass transport mechanisms in partially stratified estuaries. J. Fluid Mech.,53, 671–687.
Fischer, H. B. (1976): Mixing and dispersion in estuaries. Ann. Rev. Fl. Mech.,8, 107–133.
Hansen, D. V. (1965): Currents and mixing in the Columbia River estuary. Trans. Joint. Conf. Ocean science and Ocean engineering, 943–955, “Dyer, K. R. (1973)
Imasato, N., T. Awaji and H. Kunishi (1980): Tidal exchange through Naruto, Akasi and Kitan Straits. J. Oceanogr. Soc. Japan,36, 151–162.
Imasato, N. (1983): A numerical experiment on water and salt exchange through the Akashi and the Naruto Straits. J. Phys. Oceanogr.,13, 1526–1533.
Lettau, H. (1939): Atmosphärische Turbulentz. Akademisc Verlagsgesellschaft M. B. H. Leipzig, 61 p.
Okubo, A. (1964): Equations describing the diffusion of an introduced pollutant in a one-dimensional estuary, Stud. Oceanogr., 216–226.
Okubo, A. (1973): Effect of shoreline irregularities on streamwise dispersion in estuaries and other embayments. Neth. J. Sea Res.,6, 213–214.
Parker, D. S., D. P. Norris and A. W. Nelson (1972): Tidal exchange at Golden Gate. Proc. of ASCE,98, SA 2, 305–323.
Pritchard, D. W. (1954): A study of the salt balance in a coastal plain estuary. J. Mar. Res.,13(1), 133–144.
Pritchard, D. W. (1960): The movement and mixing of contaminants in tidal estuaries. Proc. Int. Conf. Waste Disposal Mar. Environ., 1st, ed. by E. A. Pearson, Pergamon. London, pp. 512–525.
Schmidt, W. (1925): Der Massenaustausch in freier Luft und verwandte Erscheinung. Prebleme d. Kosmischen Physik. Hamb., Grand.7(8), 8–12.
White, R. M. (1951): Meridional eddy flux of energy. Quart. J. Roy. Met. Soc.77, 188–199.
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Kashiwai, M. The concept of tidal exchange and the tidal exchange ratio. Journal of the Oceanographical Society of Japan 40, 135–147 (1984). https://doi.org/10.1007/BF02302494
- Exchange Process
- Single Exchange
- Entrance Channel
- Tidal Exchange