The design and implementation of stilling basin in water structures have been of special importance. Therefore, extensive studies have been conducted to economically optimize these structures, focusing on controlling hydraulic jumps and minimizing their dimensions. Various methods, such as using submerged vanes, are employed to increase efficiency and reduce physical construction costs. In the present study, submerged vanes with three attack angles (45, 75, and 90 degrees) and two layouts, were experimentally tested. To examination the effects of hydraulic jump parameter variations, 54 experiments were conducted. The impacts of variables were eva‎luated individually and in combination on parameters such as conjugated depths ratio, relative length, energy loss, bed shear force coefficient, and velocity profiles in hydraulic jump. The results showed that, on average, the influence of submerged vanes on reducing conjugated depths ratio, jump length, and roller length in the first layout was 9.4%, 24.6%, and 29.8%, respectively, compared to the classic state. The average relative energy loss decreased by 5.5% compared to the classic state. Considering these results and other conditions such as ease of construction and deployment, stability, and economic costs, the second layout of submerged vanes with a 45-degree attack angle is a suitable option for optimal stilling basin design. In this case, the respective improvements are 10%, 18.3%, and 17.1%, and the relative energy loss has increased by 5.9% compared to the classic state. One of the important achievements of this research is its applicability in environmental designs, especially in industrial wastewater treatment, due to intense air mixing and increased dissolved oxygen

منوچهر حيدرپوراسفرجاني

ناهيد پورعبدالله

الهام فاضل , شمس اله ايوبي