抄録
Formation of bars indicates meandering of flow and deposition or erosion in river bed. It is necessary for river improvement and water utilization to clarify this phenomenon.Therefore many researches have been conducted on bar formation. In our previous study, it was found that the channel formation process was influenced by the form of hydrograph and duration of discharge recession period. The purpose of this study is to determine the influence given to channel formation by difference of discharge recession pattern in detail. Experiment conditions are case of constancy and variation in discharge recession speed.It is found that the channel formation process is strongly influenced by gradient of hydrograph at discharge recession period. That is, the relationship both discharge and gradient of hydrograph(discharge recession speed) is important for the channel formation process.channel width is able to estimated by the stable channel width theory proposed by Ikeda. In addition, it is found that the active.
