A numerical simulation of the distribution of water temperature and salinity in the Seto Inland Sea |
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| Authors: | Mayumi Murakami Yukio Oonishi Hideaki Kunishi |
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| Institution: | (1) Geophysical Institute, Faculty of Science, Kyoto University, Sakyo-ku, 606 Kyoto, Japan;(2) Lake Biwa Research Institute, Uchidehama, 520 Ootsu, Japan |
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| Abstract: | Constant flows, as well as oscillatory tidal flow, play an important role in the long-term dispersion of water in the Seto Inland Sea. Two kinds of numerical model (1-line and 2-line models) of the Seto Inland Sea have been developed to determine the role of density-induced currents, one type of the constant flow, in water dispersion in the Inland Sea. The seasonal variations of temperature, salinity and density fields are simulated and the density-induced current field is predicted at the same time. It is found that the most appropriate value of the longitudinal eddy diffusion coefficient,K
x, is 5×106–7×106 cm2sec–1. The value of the overall mean dispersion coefficient is of the order of 107cm2sec–1 (Hayami and Unoki, 1970). Consequently, it is suggested that 50–70% of the total dispersion in the Seto Inland Sea can be attributed to currents other than density-induced currents,i.e., tidal currents, tide-induced currents and wind-driven currents.In winter, both density and velocity fields, calculated using the 1-line model, satisfy the conditions for the existence of a coastal front in Kii Channel and in the eastern Iyo-nada. |
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