Numerical Investigation Effect in Using Plate and Tilt Columnar Barrier in Controlling Turbidity Current

Entering turbidity current through reservoir dams and its sediment deposits by the dam body، it not only reduce dam''s efficient life but also reduce effective reservoir volume، block intake structures (gates) and damage power-plants. One of the procedures for controlling turbidity current and its erosion through reservoir dams is to create barriers. So in this research، it is evaluated the impact of applying plate barriers and zigzag columnar barriers with tilt angles of 45، 60، 90 degrees against the dam body by using ANSYS-CFX software. the obtained results from a simulation indicates that in subcritical turbidity current، columnar barriers (with relative height of 0. 52 equal to the flow depth and with zigzag arrangement) can cause a 60% decrease in discharge flow of turbidity current، and a 5 -fold increase in the density of the barricades، the discharge rate of the turbidity current is decreased by 6%. Furthermore، applying plate barriers with relative height of 1. 26 equal to flow height and with deviation angles (tilt angles) of 45، 60، 90 degree to the floor can take under control 50 to 80 percent of the turbidity current. In some cases which it isn''t possible to use the plate barriers because the high altitude is required، it can be applied the column barriers with zigzag arrangement and low height. As well as if barriers are installed in perpendicular position (90 degree) to the turbidity current direction، it will be more efficient than installing barriers with the above-mentioned length in tilt position.