Sensitivity of bed shear stress estimated from vertical velocity profiles : the problem of sampling resolution

Auteurs :
BIRON, P.M.
LANE, S.N.
ROY, A.G.
BRADBROOK, K.F.
RICHARDS, K.S.

Description :
The aim of this study is to simulate the uncertainty that arises from using the law of the wall in shallow streams, using a specific case-study to assess the extent to which estimates could be in error. More particularly, the effects on bed shear stress of varying 1) the range of flow depths from which observations are obtained, and 2) the lowest elevation of a measurement point above the bed, are examined. These issues are investigated using a high vertical definition of velocity measurements taken in a stream with mixed sand and gravel bed.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 1998, vol. 23, n°. 2, p. 133-139, Collation : Illustration, Références bibliographiques : 20 ref.

Date :
1998

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley