The research was carried out in order to assess the energy dissipation efficiency of zigzag elements of artificial roughness installed on the spillway face of medium- and low-pressure dams. The flow characteristics were evaluated downstream on a spillway dam model with a free flow entry to the spillway. The experiments were carried out in two stages. The first stage was to measure the flow parameters in the downstream with a smooth spillway face of the dam. The second stage provided for the placement of zigzag elements of artificial roughness in the form of a double zigzag on the spillway face of the dam. Evaluation of the effectiveness of the artificial roughness was carried out by comparing the controlled flow parameters in the same section of the transit section of the spillway from the downstream side with both considered design schemes. It has been established that the device of artificial roughness in the form of a double zigzag on the spillway face of the dam leads to a decrease in the second conjugate flow depth behind the structures and allows creating additional head losses, thereby facilitating measures to dissipate excess flow energy in the downstream. Evaluation of the effectiveness of the artificial roughness was carried out by comparing the controlled flow parameters in the same section of the transit section of the spillway from the downstream side with both considered design schemes. placement of zigzag elements on the water slope. It has been established that the device of artificial roughness in the form of a double zigzag on the spillway face of the dam leads to a decrease in the second conjugate flow depth behind the structures and allows creating a It is shown that the installation of a zgizag roughness on the spillway face of mediumand low-pressure dams changes the kinematic characteristics of the outlet flow and significantly reduces the second conjugate depth, which also favorably affects the parameters of the channel erosion behind the structure, reducing them.
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