EFFECT OF ARRANGEMENT PATTERN OF PILE DIKE ON DOWNSTREAM FLOW STRUCTURE

Abstract

 In order to propose an optimal arrangement of pile dikes in considering suspended sediment and deposition, it is necessary to investigate flow structures in a downstream region of a pile dike. In this study, flow structures and deceleration rate were investigated experimentally for one array of pile dike with different diameter and interval distance of cylinders. Downstream flow structures were affected by the diameter and interval distance of piles. Passing flow rate through the pile dike was increased as the diameter increases. The deceleration rate behind the pile dike became larger with a decrease of permeability but it reduced with an increase of the diameter even in the same permeability. The behavior of the deceleration rate was well expressed by using relative interval distance.