Interfacial Stability in Channel Flow

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Abstract
Interfacial stability in the special case of superposed turbulent layers with a zero velocity difference at the interface was examined. In contrast with previous investigations in which the primary mechanism of turbulence generation was interfacial shear, the primary source of turbulence was bottom boundary shear. Interfacial stability was defined in terms of two dimensionless parameters: the Keulegan number and a Richardson number based on the shear velocity and the maximum change in density across the flow. Laboratory flume data and field data taken downstream of thermal power plants on several rivers confirmed the hypothesis.

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