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You are here : eLibrary : IAHR World Congress Proceedings : 33rd Congress - Vancouver (2009) : Topic A: Advances in the Fundamentals of Water Science and Engineering : Global relations for liquid-granular flows over mobile bed in a wide range of slope values
Global relations for liquid-granular flows over mobile bed in a wide range of slope values
Author : Aronne Armanini and Anna Paris
One of the difficulties in modeling debris flow is the need for resistance formulae suited to describe the behavior of various flow regimes, ranging from the steep upper reaches of the channel to the mild flow in the deposition basins. For this purpose, a set of experiments involving flow mixtures of non-cohesive particles and water has been carried out in a laboratory flume under steady uniform flow conditions with different solid and liquid discharges. In highly-concentrated flows, the shear stress is due to the combined effect of the deformation of the liquid phase (grain roughness turbulence) and of inter-particle collisions. Therefore, a sum of effects approach of the two causes has been proposed, combining the Darcy- Weisbach equation and the Bagnoldian grain-inertia theory. Comparison between predicted and measured data is relatively good, provided that the maximum concentration used (solid concentration in static conditions after the deposit) is lower than the maximum possible concentration (maximum packing concentration). The theoretical prediction reproduced correctly the general trend of the data, while the experimental measurements seemed to have been less sensitive to the relative roughness, h/d.
File Size : 279,042 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 33rd Congress - Vancouver (2009)
Article : Topic A: Advances in the Fundamentals of Water Science and Engineering
Date Published : 09/08/2009
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