Effect of Meandering Parameter and Permeability on Spur-Dikes in Barak River, Assam, India.

River engineering has been one of the important study areas for geologists, hydrologists, and engineers. The open channel flow and associated hydraulics often initiate several geo-mechanical hazards including silting and scouring, meandering, and migration. In this study, an effort has been made to study experimentally the effect of changing the meandering parameters along with permeable and impermeable spur dykes at diff. inclination to the flow. It is noticed that in the early stages the scouring process develops quickly. Due to the high-pressure area in front of the Spur-dikes, the flow is accelerated around the head of the structure, creating a horseshoe-shaped vortex. During the initial twenty percent of equilibrium time, around eighty percent of the scouring takes place. It is found that in local scour coarser particles are found at the bottom and finer particles at the top. The maximum scour depth decreases with an increase in permeability. The maximum scour depth also increases with the sediment and abutment conditions for a spur-dike with a ninety-degree slope. The scour depth is less for other inclinations. This study would help in help in finding the scouring phenomena for different conditions of spur dyke.

Keywords: Meandering, Spur-dike, Scour, Permeability.