抄録
Recently, flow visualization is used to make a study of sand wave. In view of the fact that the formation of sand wave is due to the structure of flow, such a study is effective and significant. In this paper, we carried out flow visualization on the ripple models as the fundamental study of the mobile bed. The flow patternes, the eddey scale on the wake area and the length of the reattachment point were obtained by these observations.
