Document Type : Research Paper
shahid chamran university of ahvaz
Department of Hydraulic Structures, Shahid Chamran University, Ahwaz, Iran
Assistant Professor, Water Structures Department, Shahid Chamran University of Ahvaz, Iran
Gravity currents, that called density currents or buoyancy currents, are happened by the density difference between the flow and its ambient fluid. In dams reserve ambient fluid, usually has a vertical stratification. Therefore, the density current into this reservoirs may flow as interflow. In this study, the density current was investigated in ambient stratification fluid. For Experimental Investigation of velocity profile in interflow density current at stratification ambient, experiments were performed by 4 discharge 1, 1.5, 2 and 2.5 liters per second, and 4 concentrations 5, 10, 15 and 20 grams per liters on the bed slope 2.5, 3.25 and 4 percent. Stratification of ambient fluid was carried out by mixture water and salt with a deep concentration gradient. To create density flow silica particles with an average diameter of 8 microns was used. The velocity was recorded by the DOP2000 velocity meter. The measurements were performed on the central line of the flume and in 7 sections and at different intervals of the entrance. Laboratory observations showed that increasing discharge increases the velocity and thickness of the density flow body. Increasing the concentration of density flow causes the velocity to increase and the high of maximum velocity to decrease. Bed slope 3.25% has the maximum velocity between all of bed slope. Increasing of velocity decrease Richardson number.