Laboratory investigation of the performance of radial arrangement of permeable groin on the maximum scour rate of the river bed

Groins are one of the ways to protect river banks against erosion. These structures prevent their erosion by diverting the flow from the river bank. In this study, a new arrangement of permeable groin is presented, which are called radial groin. In order to investigate the behavior and performance of this type of groin, a flume with a length of 5 meters, width of 30 cm and height of 30 cm was used. The experiments were conducted with a permeability rate of 60% in clear water conditions and in the back to the flow state, and the observations from the experiments were made in relation to the maximum scouring depth and the changes in the topography of the flume bed with straight and parallel arrangement of scours with the same permeability has been compared. The results show that the radial arrangement has performed better than the parallel and direct arrangement and has been more successful in creating scour pits with less depth.