Abstract
The experimental study reported herein was carried out in a meandering flume with three consecutive bends. The radius-width ratio was 3 and the arc angles of each bend were 40°, 80° and 40° respectively. The study was performed for various cases of with and without structures. Non-submerged spur dikes were placed as river training structure in concave part of the bend entrance. The flow field without spur dikes, with one, two and three spur dikes was measured under similar flow condition in order to assess the influence of the structures on flow pattern. For the sake of comparability, the velocity field throughout the bend reach has been measured in all cases and depicted in non-dimensional form. Some specific features associated with the flow processes in a mildly meandering channel were observed. Of most notable observation in this study is the existence of a dead region near the outer part of subsequent bend induced by the structures placed in bend entrance.
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