抄録
Flow patterns at a confluence were investigated by using the oil film method and the particle tracing method in open channel flow. From the visualized images, the existences of a secondary flow at a confluence and a stagnant region just upstream from the junction were suggested;which are strongly related to the local scour at a confluence in movable bed. Also, a simple method for obtaining the width of a dead water zone by using a dividing streamline was proposed.
