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(Article of periodic en Anglais - 2013)

Document title

Transport and deposition of fine sediment in open channels with different aspect ratios

Authors(s) and Affiliation(s)

BAI J. (1 2) ; FANG H. (1) ; STOESSER T. (2) ;
(1) State Key Lab. of Hydroscience and Engineering, Beijing, CHINE
(2) School of Civil and Environmental Engineering, Georgia Inst. of Technology, Atlanta, ETATS-UNIS

Abstract

This paper investigates by means of several large eddy simulations how the channel aspect ratio affects the transport and settling of suspended sediments. The numerical method is successfully validated using data of a physical experiment of fine sediment net deposition in an open channel flow. The channel aspect ratio, A, is known to be the determining factor for the development, strength and distribution of the turbulence-driven secondary flow, and it is demonstrated that A influences the primary flow, turbulence quantities and the transport and fate of fine sediments. The secondary flow locally supports or hinders the falling of fine sediment particles in a turbulent flow, which results in a non-uniform deposition of fine sediments over the cross-section. While the channel aspect ratio has a large influence on the distribution of suspended sediments within the cross-section, its effect on the cross-sectional averaged deposition is negligibly small

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no6 [pp. 591-600]

Bibliographic references : 1 p.

Collation : 15 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3304

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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