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| Titel |
Scaling for lobe and cleft patterns in particle-laden gravity currents |
| VerfasserIn |
A. Jackson, B. Turnbull, R. Munro |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 1 ; Nr. 20, no. 1 (2013-02-18), S.121-130 |
| Datensatznummer |
250017734
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| Publikation (Nr.) |
 copernicus.org/npg-20-121-2013.pdf |
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| Zusammenfassung |
Lobe and cleft patterns are frequently observed at the leading edge of
gravity currents, including non-Boussinesq particle-laden currents such as
powder snow avalanches. Despite the importance of the instability in driving
air entrainment, little is known about its origin or the mechanisms behind
its development. In this paper we seek to gain a better understanding of
these mechanisms from a laboratory scale model of powder snow avalanches
using lightweight granular material.
The instability mechanisms in these flows appear to be a combination of those
found in both homogeneous Boussinesq gravity currents and unsuspended
granular flows, with the size of the granular particles playing a central
role in determining the wavelength of the lobe and cleft pattern. When scaled
by particle diameter a relationship between the Froude number and the wavelength
of the lobe and cleft pattern is found, where the wavelength increases
monotonically with the Froude number. |
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