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Scaling for Lobe and Cleft Patterns in Particle-laden Gravity Currents : Volume 20, Issue 1 (18/02/2013)

By Jackson, A.

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Book Id: WPLBN0003987625
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Scaling for Lobe and Cleft Patterns in Particle-laden Gravity Currents : Volume 20, Issue 1 (18/02/2013)  
Author: Jackson, A.
Volume: Vol. 20, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Munro, R., Jackson, A., & Turnbull, B. (2013). Scaling for Lobe and Cleft Patterns in Particle-laden Gravity Currents : Volume 20, Issue 1 (18/02/2013). Retrieved from http://hawaiilibrary.net/


Description
Description: Process and Environmental Research Division, Faculty of Engineering, University of Nottingham, Nottingham, UK. 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.


Summary
Scaling for lobe and cleft patterns in particle-laden gravity currents

Excerpt
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