Abstract
In the transition from supercritical to subcritical flow, an undular-water surface is formed for a low supercritical-Froude number. This flow condition is called an undular hydraulic jump. For design purposes, it is significant to know the flow condition of undular jumps and the hydraulic condition for the formation of undular jumps. In this paper, the undular jump in rectangular channels has been investigated systematically. The flow conditions of undular jumps are classified, and it has been found that the flow condition of undular jumps depends on the Froude number and the turbulent boundary-layer development at the toe of the jump. Further, the upper limit of the Froude number for the formation of undular jumps has been predicted theoretically, and verified experimentally.
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