Flow and Topography Change around Shiogama in Bisan-seto Fairway

Abstract

This study presents the results of flow, topography change and time variation of accretion or erosion rates for a symmetric semi diurnal tide around the Shiogama(namely the deepest region) at Bisan-seto fairway. The numerical analysis was carried out by LES. The flow accelerates and diverges radially during the westward current and converges during the eastward current near the top of slope around Shiogama. These numerical results of flow accord with the measured results by ADP. The accretion and erosion rates of uniform bed are approximately 0.95 times as much as those of mixture bed. The rates of accretion and erosion per unit time are below 0.01 m/h.