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| Titel |
Computation of vertically averaged velocities in irregular sections of straight channels |
| VerfasserIn |
E. Spada, T. Tucciarelli, M. Sinagra, V. Sammartano, G. Corato |
| 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 ; 19, no. 9 ; Nr. 19, no. 9 (2015-09-14), S.3857-3873 |
| Datensatznummer |
250120807
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| Publikation (Nr.) |
 copernicus.org/hess-19-3857-2015.pdf |
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| Zusammenfassung |
| Two new methods for vertically averaged velocity computation are presented,
validated and compared with other available formulas. The first method
derives from the well-known Huthoff algorithm, which is first shown to be
dependent on the way the river cross section is discretized into several
subsections. The second method assumes the vertically averaged longitudinal
velocity to be a function only of the friction factor and of the so-called
"local hydraulic radius", computed as the ratio between the integral of the
elementary areas around a given vertical and the integral of the elementary
solid boundaries around the same vertical. Both integrals are weighted with a
linear shape function equal to zero at a distance from the integration
variable which is proportional to the water depth according to an empirical
coefficient β. Both formulas are validated against (1) laboratory
experimental data, (2) discharge hydrographs measured in a real site, where
the friction factor is estimated from an unsteady-state analysis of water
levels recorded in two different river cross sections, and (3) the 3-D solution
obtained using the commercial ANSYS CFX code, computing the steady-state
uniform flow in a cross section of the Alzette River. |
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