Author(s): Kouki Onitsuka; Juichiro Akiyama; Madoka Mataga; Tomohiro Tsunematsu
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Keywords: Discharge coefficient; Side-weir; Subcritical open-channel flows
Abstract: The discharge formula of the side-weir, which can predict spill discharge per unit width in open-channel flows, involves the discharge coefficient. A lot of discharge coefficients have been suggested by many researchers. However, each researcher uses their own parameters in the discharge coefficient, irrespective of that Subramanya & Awasthy (1972) pointed out that the discharge coefficient is controlled by four parameters such as the inlet Froude number, the ratio between the height and length of the weir, the ratio between the inlet flow depth and length of the weir and the ratio between the length of the weir and channel width. In contrast, it is quite difficult to change one parameter under the condition that the other three parameters are kept. In this study, the experiments were conducted with changing all parameters under the condition that the ratio between the height and the length of the weir is set to zero. A new spill discharge coefficient of the side-weir with zero height in subcritical open-channel flows is proposed.
Year: 2005