Vertical sorting in collisional layer of bimodal sediment transport
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00337448" target="_blank" >RIV/68407700:21110/20:00337448 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.2478/johh-2020-0003" target="_blank" >https://doi.org/10.2478/johh-2020-0003</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2478/johh-2020-0003" target="_blank" >10.2478/johh-2020-0003</a>
Alternative languages
Result language
angličtina
Original language name
Vertical sorting in collisional layer of bimodal sediment transport
Original language description
Intense collisional transport of bimodal sediment mixture in open-channel turbulent flow with water as carrying liquid is studied. The study focusses on steep inclined flows transporting solids of spherical shape and differing in either size or mass. A process of vertical sorting (segregation) of the two different solids fractions during the transport is analyzed and modelled. A segregation model is presented which is based on the kinetic theory of granular flows and builds on the Larcher-Jenkins segregation model for dry bimodal mixtures. Main modifications of the original model are the carrying medium (water instead of air) and a presence of a non-uniform distribution of sediment across the flow depth. Testing of the modified model reveals that the model is applicable to flow inclination slopes from 20 to 30 degrees approximately, making it appropriate for debris flow conditions. Changing the slope outside the specified range leads to numerical instability of the solution. A use of the bimodal mixture model is restricted to the grain size ratio 1.4 and no restriction is found for the grain mass ratio in a realistic range applicable to natural conditions. The model reveals trends in the vertical sorting under variable conditions showing that the sorting is more intense if flow is steeper and/or the difference in size or mass is bigger between the two sediment fractions in a bimodal mixture.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
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
Name of the periodical
Journal of Hydrology and Hydromechanics
ISSN
0042-790X
e-ISSN
1338-4333
Volume of the periodical
68
Issue of the periodical within the volume
1
Country of publishing house
SK - SLOVAKIA
Number of pages
7
Pages from-to
92-98
UT code for WoS article
000514680600010
EID of the result in the Scopus database
2-s2.0-85082047091