Abstract
Calculations with a numerical model of the Seto Inland Sea tides show that sea level changes cause strong changes in the tidal range and pattern of diurnal inequality in Osaka Bay. A higher sea level produces a stronger diurnal inequality and a smaller tidal range; a lower sea level produces a weaker diurnal inequality and a larger tidal range. The best fit between the calculated tidal patterns and the tidal pattern that is reconstructed from the growth structures of fossils from the last interglacial is achieved with a sea level approximately 15–20 m lower than present. For a such sea level and tidal pattern, the numerical calculation gives a tidal range of about 2.65–2.8 m in Osaka Bay.
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