EXPERIMENTAL STUDY ON FORMATION OF DYNAMIC STABLE ALTERNATE BAR USING SPUR DIKES.

Abstract

 Formative hydraulic conditions of static alternate bars with sediment transport was discussed using flume experiment. Normally, alternate bars in a straight channel move down during floods. On the other hand, bars in a curved channel does not move. In this study, by changing the flow direction using spur dikes, we attempted to create a quasi-flow in the curved channel and static alternate bars were formed in a straight flume. As a result, in the case of using the spur dikes of the length about 10% of the channel width, alternate bars did not propagate. However, there was no sediment transport on bars. On the other hand, under the hydraulic conditions where no sand bar is generated without spur dikes, static alternate bars were formed using spur dikes and sediment was transport on the entire bed in the flume.