EFFICIENT PERFORMANCE OF COMPOUND GATES IN FLOW ENERGY DISSIPATION

Abstract

A study was conducted to evaluate the performance of compound gates in flow energy dissipation using a two-tiered structure (15 and 30 cm high). Four heights of the lower opening of the structure (0, 1, 2, 3 cm) were used, and seven values of flow depth over the edge of the structure (2, 3, 4, 5, 6, 7, 8 cm) were used for each case. The study concluded that the efficiency of compound gates in dissipating flow energy decreases with increasing flow depth over the edge of the structure. However, this performance increases in hydraulic structures with high elevations, especially when the height of the opening under those gates is increased, provided that the flow depth over the edge of these structures is constant. Compound gates are considered effective energy dissipaters for low-elevation structures if the opening under the gate is small.

Keywords

• hydraulic structures
• open channel flow
• energy dissipation
• weirs
• compound gates