大阪湾の潮流と海水交換に関する研究

Abstract

This paper presents physical and numerical model tests on the tidal currents in the Osaka Bay and tidal exchange process through the Akashi and the Tomogashima Straits. In the physical experiments, three models which had different geometric scales were used to verify the scale effect that would influence the dynamics in the distorted models. A vertically integrated numerical model was used to provide a comparison with the experiments and field observations and to explore the sensitivity of the tidal flow to variations in horizontal viscosity, bottom friction, Coriolis parameter and boundary conditions for solid boundaries.Velocity of tidal currents and scale of circulating flow were produced more remarkably in the physical model with a larger distortion ratio. The numerical results are fairly consisted with the experiments and field observations, showing similar tidal characteristics and tidal exchange process through the strait.