SECONDARY FLOW AND BED DEFORMATION IN COMPOUND SINUOUS CHANNEL

Abstract

Over-bank Flow in a straight channel with sinuous main channel is discussed based on experimental results. The main channel is a movable bed. The flow structure is characterized by secondary flow, and the secondary flow deforms the channel bed. Bed configuration was measured by a ultra-sonic level meter, and two components of velocity were measured by an electromagnetic flow meter. Secondary flow in a cross section was visualized by the neutral buoyant tracer method. The results indicate that three distinct eroded regions and two deposited regions on the bed are formed by the secondary flow in the case of overbank deep flow. At the downstream side of the ridge in the deposited region, secondary flow was newly produced.