NDLI: Visualization of the internal flow properties and the material exchange interface in an entraining viscous Newtonian gravity current

Content Provider	Springer Nature Link
Author	Bates, Belinda Ancey, Christophe Busson, Jean
Copyright Year	2013
Abstract	In order to simulate a simple entraining geophysical flow, a viscous Newtonian gravity current is released from a reservoir by a dam-break and flows along a rigid horizontal bed until it meets a layer of entrainable material of finite depth, identical to the current. The goal is to examine the entrainment mechanisms by observing the interaction between the incoming flow and the loose bed. The sole parameter varied is the initial volume of the gravity current, thus altering its height and velocity. The gravity current plunges or spills into the entrainable bed and the velocity of the flow front becomes linear with time. The bed material is directly affected: motion is generated in the fluid far downstream of, and in that lying beneath the encroaching front. Shear bands are identified, separating horizontal flow downstream from flow with a strong vertical component close to the step. Downstream of the step the flow is horizontal and stratified, with no slip on the bottom boundary and very low shear near the surface. Between these two regions may lie transitional zones with linear velocity profiles, separated by horizontal bands of high shear; the number of transitional zones in the cross-section varies with the initial volume of the dam-break.
Starting Page	501
Ending Page	518
Page Count	18
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	14
Issue Number	2
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-06-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Avalanche dynamics Debris flows Entrainment Viscous gravity currents Dam-break Earth Sciences Environmental Physics Hydrology/Water Resources Mechanics Hydrogeology Oceanography
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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