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ion layer in the oceanic benthic boundary layer against the stratification of the lutocline, and the growth of the planetary boundary layer (PBL) due to the turbulent mixing at the tropopause. Such mixing processes are of importance in studying and controlling various biological activities and the dispersion of pollutants in the environment. Pertinent engineering situations include mixing at the thermocline due to the dis charge of buoyant jets from power plants e.g. ocean thermal-energy con version (OTEC); water-qua lity control in stratified, multi port reservoirs; control of mixing during the operation of solar ponds; and mixing of methane gas in mine shafts. Mixing mechanisms in stratified fluids depend on the nature of the external forcing and the background
H. J. S. Fernando (Tue,) studied this question.