Abstract
A laser beam scanning technique was used to measure the rms amplitude δ of the largest wave (interfacial distortion) that is present at the entrainment interface of a stratified fluid. Both linearly-stratified and two-layer fluid systems, subjected to entrainment by oscillating-grid induced shear-free turbulence, are considered. The measurements were found to be in general agreement with a theory due to Long (1978), which predicts δ/D e ∼ Ri −3/4 , where D e is the mean thickness of the mixed layer and Ri is the appropriately defined bulk Richardson number at the interface.
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