Abstract
This paper examines classification of rapidly varied flows in a two-layered density stratified system with surface layer flowing, and the other stagnant. The analogous phenomena in open channel hydraulics are transient ones from a supercritical to a subcritical flow regime. In density stratified flows, the phenomena present remarkably different flow regimes according to some form of the upstream and downstream conditions. It is shown, on the basis of theoretical and experimental knowledges about the internal hydraulic jump, that relationships between the densimetric Froude number at the outlet, depth ratio of downstream surface layer relative to outlet depth, flow rate of entrainment of lower salt water, and types of flow are defined qualitatively.
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