Two-dimensional simulation of debris flows in erodible channels

Armanini, Aronne; Fraccarollo, Luigi; Rosatti, Giorgio

doi:10.1016/j.cageo.2007.11.008

Cited by 170 publications

(123 citation statements)

References 18 publications

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“…For debris flow assessment, numerical simulation is the most popular approach in recent years (O'Brien et al, 1993;Hutter et al, 1995;Hungr et al, 1995;Sassa et al, 2004;Liu and Huang, 2006;Nakatani et al, 2008;Armanini et al, 2009;Christen et 25 at., 2010). Although different kind of numerical programs were developed from different theories, the governing equations comes from mass and momentum conservation.…”

Section: Debris Flow Simulationmentioning

confidence: 99%

“…Although different kind of numerical programs were developed from different theories, the governing equations comes from mass and momentum conservation. With practical application of input, these models could be divided into two branches such as hydrological-based with a calibrated hydrograph at a specified inflow location (O'Brien et al, 1993;Nakatani et al, 2008;Armanini et al, 2009), and geologic-based with initial mass distributed on its source area (Hutter et al, 1995;Hungr et al, 1995;Sassa et al, 2004;Liu and Huang, 2006;Christen et at., 2010). To link debris flow simulation with landslide result, a geologic-based model is more useful for application.…”

Section: Debris Flow Simulationmentioning

confidence: 99%

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Potential Impact of Landslide and Debris Flow on Climate Extreme – A Case Study of Xindian Watershed in Taiwan

Wei

Shih

et al. 2017

Preprint

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Section: Debris Flow Simulationmentioning

confidence: 99%

Section: Debris Flow Simulationmentioning

confidence: 99%

Potential Impact of Landslide and Debris Flow on Climate Extreme – A Case Study of Xindian Watershed in Taiwan

Wei

Shih

et al. 2017

Preprint

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“…As outlined by Armanini et al (2009) debris flows can be interpreted as rapid massive sediment motions that occur in relatively small and steep catchments. Large amounts of sediment can become unstable in particular geomorphological situations and under extreme meteorological conditions Figure 1.…”

Section: Fluid Flow Processmentioning

confidence: 99%

“…apexes of alluvial fans), the subsequent step consists in representing the process propagation in space and time in those areas where the assets at risk are located. Regarding the debris-flow simulation process in the endangered area, the two-dimensional simulation model over mobile bed -TRENT 2-D -developed by Armanini et al (2009) and substantially enhanced by Rosatti et al (2013) has been applied. In this model the system of partial differential equations derived from the mass and momentum conservation principles is hyperbolic and characterized by a non-conservative nature.…”

Section: Fluid Flow Processmentioning

confidence: 99%

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A physical approach on flood risk vulnerability of buildings

Mazzorana

Simoni²,

Scherer³

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. The design of efficient hydrological risk mitigation strategies and their subsequent implementation relies on a careful vulnerability analysis of the elements exposed. Recently, extensive research efforts were undertaken to develop and refine empirical relationships linking the structural vulnerability of buildings to the impact forces of the hazard processes. These empirical vulnerability functions allow estimating the expected direct losses as a result of the hazard scenario based on spatially explicit representation of the process patterns and the elements at risk classified into defined typological categories. However, due to the underlying empiricism of such vulnerability functions, the physics of the damage-generating mechanisms for a well-defined element at risk with its peculiar geometry and structural characteristics remain unveiled, and, as such, the applicability of the empirical approach for planning hazard-proof residential buildings is limited. Therefore, we propose a conceptual assessment scheme to close this gap. This assessment scheme encompasses distinct analytical steps: modelling (a) the process intensity, (b) the impact on the element at risk exposed and (c) the physical response of the building envelope. Furthermore, these results provide the input data for the subsequent damage evaluation and economic damage valuation. This dynamic assessment supports all relevant planning activities with respect to a minimisation of losses, and can be implemented in the operational risk assessment procedure.

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Entrainment of bed material by Earth‐surface mass flows: Review and reformulation of depth‐integrated theory

Iverson

Ouyang

2015

Reviews of Geophysics

260

142

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Earth-surface mass flows such as debris flows, rock avalanches, and dam-break floods can grow greatly in size and destructive potential by entraining bed material they encounter. Increasing use of depth-integrated mass and momentum conservation equations to model these erosive flows motivates a review of the underlying theory. Our review indicates that many existing models apply depth-integrated conservation principles incorrectly, leading to spurious inferences about the role of mass and momentum exchanges at flow-bed boundaries. Model discrepancies can be rectified by analyzing conservation of mass and momentum in a two-layer system consisting of a moving upper layer and static lower layer. Our analysis shows that erosion or deposition rates at the interface between layers must, in general, satisfy three jump conditions. These conditions impose constraints on valid erosion formulas, and they help determine the correct forms of depth-integrated conservation equations. Two of the three jump conditions are closely analogous to Rankine-Hugoniot conditions that describe the behavior of shocks in compressible gasses, and the third jump condition describes shear traction discontinuities that necessarily exist across eroding boundaries. Grain-fluid mixtures commonly behave as compressible materials as they undergo entrainment, because changes in bulk density occur as the mixtures mobilize and merge with an overriding flow. If no bulk density change occurs, then only the shear traction jump condition applies. Even for this special case, however, accurate formulation of depth-integrated momentum equations requires a clear distinction between boundary shear tractions that exist in the presence or absence of bed erosion.

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Two-dimensional simulation of debris flows in erodible channels

Cited by 170 publications

References 18 publications

Potential Impact of Landslide and Debris Flow on Climate Extreme – A Case Study of Xindian Watershed in Taiwan

Potential Impact of Landslide and Debris Flow on Climate Extreme – A Case Study of Xindian Watershed in Taiwan

A physical approach on flood risk vulnerability of buildings

Entrainment of bed material by Earth‐surface mass flows: Review and reformulation of depth‐integrated theory

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