Abstract
The turbulent structure of an open channel flow with two flood plains were investigated experimentaly. We used tow kinds of channels which were a straight one and a curved one. Velocity measurements were made by following two methods : 1) measurements of velocity components with a hot-film anemometer and 3mm diameter propeller flowmeter, 2) measurements of longitudinal velocity component on a free surface using the flow visualization technic of Cameron effect. Main results obtained through experiments are as follows : 1) the upward flow from the edge of flood plain to the free surface exists in a straight channel and a curved one, 2) in a curved channel the turbulent structure is described by three independent spiral motions and two upward flows.
