砕波時の戻り流れの内部流速場への影響について

抄録

The phisical characterristics of breaking wave are investigated in cases of permitting to occur the return current and compulsorily removing it.Breaking wave motion is complicated by variety factors and connecting them.Effective one of these factors is return current which have a large scale effect compair with other factors as viscosity, capiraly stress, and turbulent. Therefore it is very important to investigate how the return current affect to the inner velocity field at breaking.Since the fluid motion is temporally and spacially unsteady in the breaking zoon, the messurement of fluid motion should be carry out in the view of these aspects.In this paper, the inner velocity at breaking is spacially investigated by perticle image velocimeter.Especially, we could understand that the structure of fluid motion is sufferd by the return current.