Computation of vertically averaged velocities in irregular sections of straight channels

Eleonora Spada, Marco Sinagra, Vincenzo Sammartano, Tullio Tucciarelli, Vincenzo Sammartano, Corato, Giovanni Corato

Risultato della ricerca: Article

4 Citazioni (Scopus)

Abstract

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 beta. 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.
Lingua originaleEnglish
pagine (da-a)3857-3873
Numero di pagine43
RivistaHydrology and Earth System Sciences
Volume19
Stato di pubblicazionePublished - 2015

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Earth and Planetary Sciences (miscellaneous)

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