Numerical simulations of partially saturated granular dam-break flows
Abstract
Collapses of grain-water mixture column and flows of the mixture behave differently depending on the amount of water present in the granular matrix. Small amounts of water can strengthen the granular materials due to the surface tension of water that increases material cohesion. This allows the mixture column to resist failures better than if it were dry. If too much water is present the water may act to increase the pore pressure, reducing friction, accelerating the collapsing process and resulting in different types of flow behaviors. In this work, the focus is on the development of a numerical model for simulating dam-break flows of partially saturated granular materials in which the amount of water present is taken into consideration to define material properties and constitutive equation to address the concerns listed above. The model considers a two-dimensional vertical flow of grain-fluid mixture. The developed model is tested against the experimental work of Rebillout et al., 2017.
Rebillout, L., Ozeren, Y., and Altinakar, M., 2017, "Dam-break flow measurements of granular-liquid mixtures in a channelized reservoir," Presented at Hydraulic Measurements & Experimental Methods Conference, New Hampshire, July 9-12.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMEP41B2667P
- Keywords:
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- 1810 Debris flow and landslides;
- HYDROLOGYDE: 1824 Geomorphology: general;
- HYDROLOGYDE: 1862 Sediment transport;
- HYDROLOGYDE: 3265 Stochastic processes;
- MATHEMATICAL GEOPHYSICS