Experimental investigation of the response of an alluvial river to a vertical offset of its bed | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Experimental investigation of the response of an alluvial river to a vertical offset of its bed

Type de publication:

Journal Article

Source:

River, Coastal and Estuarine Morphodynamics: Rcem 2007, Vols 1 and 2, p.179-184 (2008)

Numéro d'accès:

ISIP:000252235800023

Mots-clés:

Dynamique des fluides géologiques, UMR 7154

Résumé:

<p>We study the question of the lifetime of a vertical offset generated in the bed of an alluvial gravel-bed river by faulting. This problem is adressed experimentally by investigating the response of a micro-scale river to a vertical offset of its bed. Calibration of the experimental sediment transport law and of the velocity water depth relationship allow us to write the equation describing the evolution of the bed elevation. Scaling considerations further reveal that, in their dimensionless form, the equations governing the evolution of a natural or an experimental river are identical. The differences of time and length scales at work in experimental and natural rivers are encoded in the expression of only two parameters. This result justifies the use of a microscale river and provides the key to (and the extent up to which) extrapolate our experimental results to the field scale.</p>

Notes:

DohmenJanssen, CM 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics SEP 17-21, 2007 Univ Twente, Enschede, NETHERLANDS