The influence of microform bed roughness elements on flow and sediment transport in gravel bed rivers

Auteurs :
HASSAN, M. A.
REID, I.

Description :
A series of laboratory flume experiments shows that flow resistance rises to, and falls from, a peak value as the longitudinal spacing of pebble clusters decreases, in a manner similar to that shown by others for strip roughness, isolated blocks, and simulated ripples and dunes. The experiments also reveal a strong inverse relationship between bedload flux rates and the flow resistance induced by the concentration of pebble clusters. It is concluded that pebblo cluster spacing tends towards an equilibrium that is regulated by a feedback process involving sediment transport rates and that the spatial concentration of these microforms will adjust to the point where they induce maximum flow resistance.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 1990, vol. 15, n°. 8, p. 739-750, Références bibliographiques : 40 réf.

Date :
1990

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