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EXPERIMENTAL STUDY ON THE EFFECT OF A T- SHAPED SPUR DIKE LENGTH ON SCOUR IN A 90 ° CHANNEL BEND

ABSTRACT Spur dikes are used for preventing river bank erosion. The flow and scouring pattern around the spur dikes are complicated, especially when spur dikes are used in the bend. This is mainly due to the interaction between the flow pattern associated with the spur dike and the helical currents in the bend. This paper presents results of experiments on scour around a T- shaped spur dike located in a 90 degree bend. The effect of spur dike length on the amount of scour is investigated. Experiments were conducted in a re-circulating rectangular channel. The results show that with the increase in the length of the T-shaped spur dike, the maximum scour depth and the volume and dimensions of the scour hole increases. Increasing the length of the spur dike increases the height of the ridge at the downstream of the spur dike. The location of the maximum scour depths occurs at a distance of about 10 to 20 percent of the spur dikes length from the upstream nose of the spur dike. Key words :