LAUSR

An attempt has been made in this study to check the adequacy of the trap efficiency on the deposition amount, movement, and pattern of the sediment using three-dimensional Computational Fluid Dynamics (CFD) on a settling basin of Budhi-Ganga Hydropower Project (BHP). The prediction of the amount of sediment deposition, its movement, and deposition pattern is necessary during the planning, designing, and implementation phase of the hydropower projects as sediment particles larger than a certain size can cause erosion and damages to underwater machines. Four different cases with seven different particle sizes (0.8125mm, 0.4375mm, 0.2325mm, 0.1975mm, 0.15375mm, 0.10125mm and 0.075mm) has been taken during simulation. Trap efficiency for different particle sizes has been compared and trap efficiency of 99% was achieved for the particle size 0.2mm from numerical simulation which is a 13% deviation with the result obtained from physical modeling. Keywords— Settling basin, deposition pattern, trap efficiency, CFD, FLOW-3D