Mixing processes at river confluences: Field informed numerical modelling

Détails

ID Serval
serval:BIB_07AB94D9C4D3
Type
Actes de conférence (partie): contribution originale à la littérature scientifique, publiée à l'occasion de conférences scientifiques, dans un ouvrage de compte-rendu (proceedings), ou dans l'édition spéciale d'un journal reconnu (conference proceedings).
Collection
Publications
Titre
Mixing processes at river confluences: Field informed numerical modelling
Titre de la conférence
ENVIRONMENTAL HYDRAULICS
Auteur⸱e⸱s
Lane SN, Bradbrook KF, Caudwell SWB, Richards KS
ISBN
90-5809-035-3
Statut éditorial
Publié
Date de publication
1999
Editeur⸱rice scientifique
Lee JHW, Jayawardena AW, Wang ZY
Pages
345-350
Notes
2nd International Symposium on Environmental Hydraulics, HONG KONG,
PEOPLES R CHINA, DEC 16-18, 1998
Résumé
This paper reports combined results from field monitoring and numerical
modelling of mixing processes at river channel confluences. The field
results use an Acoustic Doppler Velocimeter to measure simultaneously
three-dimensional flow velocity and suspended sediment concentration in
a small measuring volume 5cm below the sensor head. The velocimeter was
deployed in a confluence of three channels each with different
suspended sediment concentrations. Data were collected from along a
mixing layer interface between two of the confluent channels. The
results illustrate that mixing occurs on a number of temporal scales,
but that the nature of the link between periodic flow field
fluctuations and suspended sediment transport varies with distance
through the confluence. There is a strong correlation between
cross-stream velocity variation and suspended sediment transfer at the
entry to the confluence, associated with the presence of a stagnation
zone. After rapid development of these instabilities, their further
evolution is associated with eddy stretching, such that whilst there
remain strong fluctuations in suspended sediment concentration further
downstream, these are no longer correlated with velocity variation.
Preliminary attempts to model these processes numerically are presented
based upon Large Eddy Simulation.
Web of science
Création de la notice
03/02/2011 14:41
Dernière modification de la notice
20/08/2019 12:30
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