Experimental Study on The Arrangement Effect of Cylindrical Obstacles on Saline Density Current body

Density currents occur when fluid of one density propagates into a fluid of different density. These currents are the main caude for sediment transport in dam reservoirs and estuaries. The negative effects of density currents can be minimized using obstacles. The obstacles can totally or partially block density currents and thus sedimentation will occur far from the dams. In this paper, the effect of cylindrical obstacles and their arrangement on density current body is experimentally studied. Obstacles with constant diameter and height were glued on the bed in staggered form. The staggered form were constant during all the experiments, but transverse longitudinal distances between obstacles were variable. It caused two beds with different arrangement of obstacles. The results indicated that rate of mixing in bed with obstacles is greater than bed without obstacles. So velocity and height of head in bed with obstacles decrease about 40 present.