In: Journal of Hydrology and Hydromechanics, vol. 68, no. 1
Štěpán Zrostlík - Václav Matoušek
Detaily:
Rok, strany: 2020, 92 - 98
Jazyk: eng
Kľúčové slová:
Grain segregation; Bimodal mixture; Granular flow; Sheet flow; Sediment transport.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
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.
Ako citovať:
ISO 690:
Zrostlík, Š., Matoušek, V. 2020. Vertical sorting in collisional layer of bimodal sediment transport. In Journal of Hydrology and Hydromechanics, vol. 68, no.1, pp. 92-98. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2020-0003
APA:
Zrostlík, Š., Matoušek, V. (2020). Vertical sorting in collisional layer of bimodal sediment transport. Journal of Hydrology and Hydromechanics, 68(1), 92-98. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2020-0003
O vydaní:
Vydavateľ: VEDA, Publishing House of the Slovak Academy of Sciences, Bratislava, Slovakia
Publikované: 15. 3. 2020