Abstract

A differential model is developed and used to predict the transient response of a salt-stratified, double-diffusive system heated from below. Predicted mixed layer heights and temperature distributions are in good agreement with data and in reasonable agreement with predictions based on simpler one- and two-layer models. Key features of the system, such as the substantial density difference across the interfacial boundary layer, negligible variation of the salinity profile in the stable region, and locations of highly anisotropic fluid motion are well described by the model. Predicted turbulence characteristics are plausible, and predicted mixed layer growth rates are consistent with accepted correlations involving a convective velocity and a mixed layer Richardson number.

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