Advanced two-phase modelling and unified simulations of landslides, avalanches and debris flows: Some innovative engineering applications
We present advanced models and simulation techniques for the transport and flow of a real two-phase mixture of rock particles and non-Newtonian viscous fluid down slopes and channels. This technique combines novel mechanics formulations and modeling into a unified high-resolution framework, providing a unique opportunity to simulate two-phase subearial landslides and debris flows with dynamically changing concentrations of solid particles. This mixture then impacts downslope with particle-laden fluid reservoirs, rivers, fjords, lakes, or oceans. This results in a super tsunami wave in the fluid body, while the submarine debris flow moves along the bathymetry. The same modelling technique can be applied to simulate rock-ice avalanches and turbidity currents with changing physical properties and mechanical responses of the phases that enhances the flow mobility. Inclusion of the internal mass and momentum exchanges between the phases leads to the generation of observed frontal and several other secondary surges. These results fundamentally advance our present knowledge associated with the complex mechanics and dynamics of multi-phase geophysical mass flows, including the subearial and submarine sediment transport and deposition processes. Our findings contribute significantly to our understanding of mixing and separation between phases, generation and propagation of special solid and fluid structures, and phase-transitions during the flow. These results provide new insights into the evolution of morphodynamics of steep mountain slopes and valleys. Some innovative engineering applications are discussed including sediment transport on hill slopes, river streams, hydraulic channels (hydro-power reservoirs/plants, their integrity and efficiency); lakes, fjords, coastal lines, and aquatic ecology; and submarine debris impact and the rupture of fiber optic, cables and pipelines along the ocean floor, and damage to offshore drilling platforms.
https://www.munich-geocenter.org/events/seminars/frontiers-in-earth-sciences-14/advanced-two-phase-modelling-and-unified
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Advanced two-phase modelling and unified simulations of landslides, avalanches and debris flows: Some innovative engineering applications
Abstract
We present advanced models and simulation techniques for the transport and flow of a real two-phase mixture of rock particles and non-Newtonian viscous fluid down slopes and channels. This technique combines novel mechanics formulations and modeling into a unified high-resolution framework, providing a unique opportunity to simulate two-phase subearial landslides and debris flows with dynamically changing concentrations of solid particles. This mixture then impacts downslope with particle-laden fluid reservoirs, rivers, fjords, lakes, or oceans. This results in a super tsunami wave in the fluid body, while the submarine debris flow moves along the bathymetry. The same modelling technique can be applied to simulate rock-ice avalanches and turbidity currents with changing physical properties and mechanical responses of the phases that enhances the flow mobility. Inclusion of the internal mass and momentum exchanges between the phases leads to the generation of observed frontal and several other secondary surges.
These results fundamentally advance our present knowledge associated with the complex mechanics and dynamics of multi-phase geophysical mass flows, including the subearial and submarine sediment transport and deposition processes. Our findings contribute significantly to our understanding of mixing and separation between phases, generation and propagation of special solid and fluid structures, and phase-transitions during the flow. These results provide new insights into the evolution of morphodynamics of steep mountain slopes and valleys. Some innovative engineering applications are discussed including sediment transport on hill slopes, river streams, hydraulic channels (hydro-power reservoirs/plants, their integrity and efficiency); lakes, fjords, coastal lines, and aquatic ecology; and submarine debris impact and the rupture of fiber optic, cables and pipelines along the ocean floor, and damage to offshore drilling platforms.
