Experimental Study of Hydraulic Jump Characteristics in a Double-Sill Stilling Basin
Abstract
A stilling basin is a structure used in hydraulic engineering to dissipate the energy of flowing water, typically downstream of hydraulic structures like spillways, outlet works, and chutes. The primary purpose of a stilling basin is to reduce water velocity to prevent erosion and damage to downstream channels and infrastructure. The energy dissipation of water flow is crucial for designing structures like stilling basins. The United States Bureau of Reclamation (USBR) sets standards, including the Froude number (F1) at the toe of the spillway, that must be considered in stilling basin planning. An alternative design to these standards is to use a double-sill stilling basin downstream of the chute channel, with specific spacing and height. This study's objective was to assess the efficacy of a double-sill energy dissipator in diminishing the flow energy within a stilling basin. The rationale behind this was that these energy dissipators are particularly adept at disrupting and weakening the water flow. Laboratory hydraulic physical model tests were conducted with double sills in fixed positions and at varying heights because previous studies indicated that the shape and size of sills affect energy dissipation. The results from these tests provide better insights into flow behavior in an overflow system regarding energy dissipation.
Keywords: hydraulic jump, double-sill stilling basin, energy dissipation.
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