摘要：In this study, investigation on the time development of local scour on around a T-shape spur dike in a 180 degree flume bend are presented. The T-shape spur dikes have been used extensively for erosion control in the external wall of river bends. Experimental investigation on scoring and determination of depth of scoring are among the most important issues in T-shape spur dike designation. The study was conducted using in a 180 degree laboratory flume bend. Experiments were conducted for different locations of T-shape spur dikes at the bend with various Froude number. In this study, the time development of the local scour around the T-shape spur dike plates was studied. The time development of the scour hole around the model T-shape spur dike installed was compared with similar studies on spur dikes. The amount of scour at the upstream of T-shape spur dike is much more as compare to that at the downstream of T-shape spur dike. The results of the model study indicated that the maximum depth of scour is highly dependent on the experimental duration. It was observed that, as Froude number increases, the scour increase. All Froude numbers, at location of 60° results maximum increase in scour depth. Measuring depth of scouring based on experimental observation, an empirical relation is developed with high regression coefficient 92%.
