Abstract
The rotary gate is a recently proposed gate for application in semicircular elevated irrigation networks. In this study, the hydraulics of rotary gate submerged flow was theoretically and experimentally investigated. Two approaches for estimating the submerged flowrate were considered, namely the stage-discharge based on the superposition rule and the dimensional analysis principles. The results revealed that the gate opening angle and the submergence ratio affect the submerged discharge the most. Based on the compiled experimental data relationships for estimating the discharge in such flow conditions were presented. Statistical analysis indicated that both approaches yielded satisfactory results for discharge estimation. Also, the submerged threshold condition of the rotary gate was investigated and a relationship was proposed whose results concurred with the observed data. In addition, the gate discharge coefficient and its head loss were studied and relationships for determining the discharge coefficient and the relative head loss in submerged flow condition were proposed.
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