Experiments in Longitudinal Dispersion with Dead Zones

by Eric M. Valentine, Engr.; Ministry of Works & Development, Wellington, New Zealand,
Ian R. Wood, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Canterbury, Christchurch, New Zealand,

Serial Information: Journal of the Hydraulics Division, 1979, Vol. 105, Issue 8, Pg. 999-1016

Document Type: Journal Paper


A series of laboratory experiments is reported which lends support for the need to consider the effects of dead zone trapping on the longitudinal dispersion process in natural streams. This may offer an explanation for the apparent non-applicability of Taylor's theory in some rivers. The results of an experiment devised to test the frozen cloud hypothesis with dead zones are presented. Experiments show an increase in the dispersion coefficient and delay in arrival at the diffusive period due to the presence of dead zones. These results are used to verify a two-dimensional computer solution which has been previously reported by the authors.

Subject Headings: Rivers and streams | Computer networks | Diffusion | Verification

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