摘要：In this study, experiments on two physical models of a morning glory spillway, one with a bell shaped opening, another with a modern square shaped opening, were developed to measure the hydraulic flow, its effect on pressure changes and the discharge coefficient. The extent of cavitation on both spillways types at various flow rates and the extent of damage and hazard at specified points on the crest of the spillway were measured, and the critical points on the spillways identified. The effects of flow rates and pressure along various vertical cross sections of the spillway shaft were evaluated and the probability for cavitation occurring was analyzed as per the obtained cavitation index. The graph shows measured pressure at various points on both spillways based on a non-dimensional Froude number. By changing the shape of the cross section, its direct effect on the amount of pressure and cavitation indices; in as such that with the change in the form of the upper cross section from a bell shaped form to a square shape at a specific flow rate and specific points, the pressure increased while the extent of cavitation decreased; moreover, with the increase in flow rate the amount of pressure increased.
关键词：Morning glory spillway;spillway discharge coefficient;changes in pressure;circulation number;cavitation;pressure;discharge
