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Plume Rise Formulas. The determination of [delta]h is not well defined, for the smoke plume in the passive stage does not level off.... Davidson (1961) assumed that [delta]h is equal to the height at which the slope of the plume is less than 0.1. Bosanquet (1957) defined [delta]h as the height at which the plume loses its momentum and buoyancy. Several formulas (over 100 formulas) have been prepared to determine [delta]h under different meteorological conditions. None of the formulas, however, appears to predict [delta]h successfully all the time. This is because the meteorological and topographical conditions are greatly simplified....  1, fiche 1, Anglais, - plume%20rise%20formula

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