Combined load in open channel: Modelling of transport layer at high bed shear
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00347729" target="_blank" >RIV/68407700:21110/20:00347729 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1201/b22619" target="_blank" >http://dx.doi.org/10.1201/b22619</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1201/b22619" target="_blank" >10.1201/b22619</a>
Alternative languages
Result language
angličtina
Original language name
Combined load in open channel: Modelling of transport layer at high bed shear
Original language description
Solid-liquid flows in geomorphological processes transport grains which are often supported by a combination of mutual collisions and turbulent suspension. The dominating support mecha-nism depends primarily on the size of transported sediment grains and on their local position within the internal structure of the sediment carrying flow. We focus on steady-state uniform turbulent open-channel flow in which some grains are suspended by turbulent eddies of carry-ing liquid and the rest is transported as (collisional) bed load. A modelling approach is dis-cussed which employs the flow internal structure (distributions of velocity and solids concen-tration) and quantifies a distribution of turbulent characteristics across the flow depth. This en-ables to evaluate at the local level the ability of the carrying liquid to support transported sedi-ment grains by the diffusive action of carrier turbulent eddies. The modelling results, obtained for flow conditions observed experimentally for lightweight sediment in our laboratory tilting flume, indicate that the widely used criterion for incipient turbulent suspension (the ratio of bed shear velocity and grain terminal settling velocity greater than 1.25) is appropriate. The chance for the local turbulent support (as additional mechanism to contact support) of grains appears to be more likely in the upper part of the transport layer developed in the flow above the mobile bed then in the lower part where intergranular contacts dominate. The part with turbulent sup-port of grains increases with the bed Shields parameter.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20101 - Civil engineering
Result continuities
Project
<a href="/en/project/GA19-18411S" target="_blank" >GA19-18411S: Modelling of intense collisional sediment transport with turbulent suspension</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Proceedings of the 10th International Conference on Fluvial Hydraulics
ISBN
978-1-003-11095-8
ISSN
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e-ISSN
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Number of pages
8
Pages from-to
308-315
Publisher name
Taylor and Francis
Place of publication
Abingdon
Event location
Delft
Event date
Jul 7, 2020
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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