Abstract

This paper explored the free-surface wave behavior in prismatic open-channel. The one-dimensional Boussinesq model was used for transient flow description, along with the (2/4)-dissipative scheme implemented for numerical computations. Investigation addressed the flow behavior in a rectangular open-channel supplied by a constant depth reservoir and equipped with a sluice gate at its outlet inlet. The determination of the fundamental pulsation of the hydraulic system followed from the water-hammer concept, used in pressurized-pipe flows. Two kinds of boundary conditions were investigated; involving the abrupt closure and/or the sine-excitation of the sluice-gates. Results showed that the sine excitation case, using the fundamental pulsation of the hydraulic system, induced a significant depth rise; which may lead to the flood of the channel. Furthermore, it was found that the free-surface wave pattern was driven by the sine excitation using submultiple value of the fundamental pulsation; however, this pattern was controlled by the abrupt closure maneuver for the case using submultiple values of the fundamental pulsation.

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