Pressure Coefficient in Dam-Break Flows of Dry Granular Matter
Publication: Journal of Hydraulic Engineering
Volume 139, Issue 11
Abstract
The propagation of dry granular flows, such as rock and snow avalanches, can be described by depth-averaged models. Different from classical shallow-water equations, these models take into account the anisotropy of normal stresses inside the flowing pile through using an earth pressure coefficient in the pressure term. A new regularization function for calculating the pressure coefficient in the Savage-Hutter-type models at the early stages of dam-break flows and collapses is proposed. In such circumstances the flow lines are significantly curved with respect to the basal surface and a special treatment of the earth-pressure coefficient is required for obtaining a satisfactory agreement with experimental data. The comparison between numerical simulations and laboratory experimental data shows an apparent improvement in describing the early stages of dam-break waves over rough beds. The comparison with experiments over smooth bed surface exhibits minor evidence of improvement. Nonetheless, in this case the proposed formula yields results similar to what obtained by the original Savage-Hutter formula.
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Acknowledgments
L. Sarno would like to thank for the financial support by the Ph.D. grant from University of Napoli Federico II. Y.C. Tai would like to thank for the final support by National Science Council, Taiwan (Project No.: NSC-101-2628-E-006-019-MY2).
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Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 11 • November 2013
Pages: 1126 - 1133
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Aug 9, 2012
Accepted: May 2, 2013
Published online: May 4, 2013
Discussion open until: Oct 4, 2013
Published in print: Nov 1, 2013
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