✦ LIBER ✦

On the use of Taylor's translation hypothesis for diffusion in the mixed layer

✍ Scribed by G. E. Willis; J. W. Deardorff

Publisher: John Wiley and Sons
Year: 1976
Tongue: English
Weight: 523 KB
Volume: 102
Category: Article
ISSN: 0035-9009
DOI: 10.1002/qj.49710243411

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✦ Synopsis

Abstract

Diffusion measurements in a modelled mixed layer support the equivalence of an instantaneous line‐source concentration field without a mean wind and a continuous point source with a mean wind when use is made of Taylor's translation hypothesis. Taylor's hypothesis as applied to mixed‐layer diffusion appears to break down in this type of flow for values of s̀~u~/U > 0.5, where s̀~u~ is the horizontal turbulence velocity component and U is the uniform mean wind. Variations in expected levels of cross‐wind integrated concentration are presented as a function of height and distance downstream from the source for a sampling duration of 4__z~i~/U__, where z~i~ is the mixed‐layer depth.

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