Experimental Consideration on Height and Distance Effects of Consecutive Small Dam in Trapping of Sedimentation

Sediment transport is one of the important indicators of rivers in natural conditions, which is affected by the change in geometric and flow characteristics, and is reflected in the alignment or sedimentation of different river routes. Therefore, providing suitable solutions for sediment control and fixing the longitudinal slope of the substrate and preventing sediment transport from upstream areas with a steep slope into the dams reservoirs, which is a major reason for their useful life, The necessity of carrying out the experiment in this field is justified. This research studies the sedimentation status and how it is controlled using the physical model of short successive dams made of Plexiglass at three altitudes and three different distances when the slope of the substrate and the discharge changes. Dimensional analysis was performed by Buckingham method to determine the variables such as depth ratio to height (y/H) and depth to distance (y/L) as effective factors in determining the percentage of cumulative sediment trapping (Teg). Accordingly, the relationship between the aforementioned ratios with the percentage of sediment trapping using dimension-less factor of Froude number as an independent variable in different scenarios has been investigated and evaluated Walls in the model, have been proposed for different slopes.