Titre
Sensitivity of bed shear stress estimated from vertical velocity profiles: The problem of sampling resolution
Type
article
Institution
Externe
Périodique
Auteur(s)
Biron, P.M.
Auteure/Auteur
Lane, S.N.
Auteure/Auteur
Roy, A.G.
Auteure/Auteur
Bradbrook, K.F.
Auteure/Auteur
Richards, K.S.
Auteure/Auteur
Liens vers les personnes
ISSN
0197-9337
Statut éditorial
Publié
Date de publication
1998
Volume
23
Numéro
2
Première page
133
Dernière page/numéro d’article
139
Langue
anglais
Notes
Publication type : Article
Résumé
Bed shear stress in open channel flows is often estimated from the
logarithmic vertical velocity profile, However, most measuring devices
used in the field do not allow for flow velocity to be measured very
close to the bed. The lack of near-bed measurements is a critical loss
of information which may affect bed shear stress estimates. Detailed
velocity profiles obtained from a field acoustic Doppler velocimeter
over three different bed roughnesses clearly show that the inclusion of
near-bed points is critical for the estimation of bed shear stress in a
shallow river environment. Moreover, the results indicate that using
the full flow depth instead of the bottom 20 per cent of the profile
generates an underestimation of the shear stress when flow is uniform.
logarithmic vertical velocity profile, However, most measuring devices
used in the field do not allow for flow velocity to be measured very
close to the bed. The lack of near-bed measurements is a critical loss
of information which may affect bed shear stress estimates. Detailed
velocity profiles obtained from a field acoustic Doppler velocimeter
over three different bed roughnesses clearly show that the inclusion of
near-bed points is critical for the estimation of bed shear stress in a
shallow river environment. Moreover, the results indicate that using
the full flow depth instead of the bottom 20 per cent of the profile
generates an underestimation of the shear stress when flow is uniform.
PID Serval
serval:BIB_708D33FE0E6F
Date de création
2011-02-03T13:41:07.389Z
Date de création dans IRIS
2025-05-21T00:03:56Z