Experimental Study of Scour in Series of T-Shape Spur Dike at River Bend

Experimental investigation on scoring and determination of depth of scoring are among the most important issues in T-shape spur dike designation with model T-shape spur dike was measured in a laboratory flume with 180 degree bend under clear water. In this study, we conducted evaluate the effect of relative distance between two T-shape spur dikes in the bend on the occurred scour. For this purpose, two spur dikes were installed at four different relative distances and four different relative lengths in the first half of an180 degree bend. All experiments were performed in four Froude number and a constant flow depth. The results show that with increasing the relative distance of T-shape spur dikes, the relative maximum scour depth increase at the opening of the spur dikes. Measuring depth of scouring based on experimental observation, an empirical relation is developed with high regression coefficient 0.98.