Abstract
Under stormy waves on a sandy beach, a flat movable bed may appear when ripples have been washed out. Study on the sheet flow has recently received much attention because huge amount of sand is transported under such condition However, very little understanding has been obtained thus far because of difficulties of the measurement.
To simulate the flow field, the present study has developed a numerical model based on a two-phase flow approach. The calculated results on the fluid velocity, sediment transport velocity and sediment concentration show fairly good agreements with existing experimental results under sheet flow condition. The increase of apparent bottom roughness due to sediment movement is also depicted by the present model.
