2004 Volume 48 Pages 859-864
This study aims to clarify the flow structure in curved rectangular open channel with a side concavity. Surface flow velocity profile is measured using PIV technique and bottom flow direction is obtained by a new method using image analysis of bottom streamlines visualized by dye injection method. In curved channel flow, developing process of secondary flow is examined. The structure of channel flow with side concavity in each side is investigated and their differences are clarified. The results show that water level is lager in the case the side concavity is installed in the outer bank. On the other hand, surface fluctuation is greater in the inner bank case. The aspect ratio of channel width to water depth changed the structure of the flow around side concavity.
