Effects of a Permeable Hydraulic Flashboard Spur Dike on Scour and Deposition

This paper presents the results of laboratory experiments to investigate the effects of permeable hydraulic flashboard spur dike (PHFSD) on scour and deposition using a movable-bed physical model. The study included two sets of experiments. The first set of tests focused on the effect of PHFSD on scour and deposition near the bank. The second set of tests investigated the factors influencing flow velocity retardation and promotion of deposition. Experiments were carried out with both permeable and solid flashboard spur dikes to investigate the influence of relative spur dike length, geometry and arrangement of holes, and coefficient of permeability on the scour and deposition characteristics. Average flow velocity and deposition height at cross sections upstream and downstream of the spur dike, and the maximum scour depth at the spur dike head were measured. The results show the influence of these factors on the scour and deposition characteristics and the effectiveness of the PHFSD.