Local bed morphological changes due to oriented groins in straight channels

This research investigates the effect of implementing oriented groins on the scour and silting processes in a straight channel. Combined physical and numerical models were used. Twentyseven (27) runs were conducted in which the geometry of scour and silting associated with model groins was evaluated. Groin models were angled at 60°, 90°, and 120° to the downstream channel side wall with contraction ratios of 0.10, 0.15 and 0.20. The main goals of this paper were to evaluate the effect of the three angles on the scour geometry on minimizing erosion adjacent to the stream banks. Results were analyzed and were graphically presented and the percentages of errors between the obtained results from the used models were reported to define the sufficient compatibility between the used models. Simple formulae were derived to evaluate the scour and silting parameters.