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Channel degradation and slope adjustment in steep streams controlled through bed sills

Auteur(s) et Affiliation(s)

MARTÍN-VIDE, J.P.
Technical Univ. of Catalonia (UPC), Hydraulics Dep., Barcelona, Espagne
ANDREATTA, A.
Technical Univ. of Catalonia (UPC), Hydraulics Dep., Barcelona, Espagne


Description :
The case-study of the Les Arenes-Palau-Rubí rivers is a system of 2 tributaries and a main river in northeast Spain, characterized by its short length, steepness and ephemeral nature. The comparison of bed profiles since 1962 revealed an incision greater than 5.5 m. The main causes of degradation are thought to be channelization (width reduction) and urban growth. The equilibrium slopes with and without sills were obtained in 111 live-bed flume tests. It is demonstrated that the bed slope is milder with sills than without sills under the same flow and sediment rates. The equations for the calculation of equilibrium slopes, scaled to ptototype, are applied to the case-study, with good agreement.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 1, p. 38-47, nombre de pages : 10, Références bibliographiques : 29 ref.

Date :
2009

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

Langue :
Anglais
Droits :
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