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| Titel |
Longitudinal dispersion in natural channels: 3. An aggregated dead zone model applied to the River Severn, U.K. |
| VerfasserIn |
P. M. Davis, T. C. Atkinson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 4, no. 3 ; Nr. 4, no. 3, S.373-381 |
| Datensatznummer |
250001745
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| Publikation (Nr.) |
 copernicus.org/hess-4-373-2000.pdf |
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| Zusammenfassung |
| An Aggregated Dead Zone (ADZ) model is presented for longitudinal
dispersion of
tracer in river channels, in which the channel cross-section is divided into two
parallel regions: the bulk flow and dead zone storage. Tracer particles in the
bulk flow are assumed to obey plug-flow advection at the discharge velocity U
without any mixing effects. The dispersive properties of the model are
completely embodied in the residence time for tracer storage in the dead zone.
The model provides an excellent description and prediction of empirical
concentration-time distributions, for times t < x/U. Its physical realism
is demonstrated by using it to describe the evolution of a tracer cloud in the
River Severn, U.K., and by comparing it with a more complex model which
incorporates the additional effects of shear flow dispersion within the bulk
flow. The ADZ model is a potentially useful tool for practical prediction of
dispersion in natural channels.
Keywords: Channels; dispersion; dead zones; tracers; River Severn |
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