Analysis of debris flow behavior with a one dimensional run-out model incorporating entrainment

Luna, B. Quan; Remaître, Alexandre; Asch, Th.W.J. van; Malet, Jean-Philippe; Westen, C.J. van

doi:10.1016/j.enggeo.2011.04.007

Cited by 147 publications

(79 citation statements)

References 46 publications

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“…However, in general, entrainment plays a major role for the travel distance of granular flows (e.g. McDougall and Hungr, 2005;Sovilla et al, 2006Sovilla et al, , 2007Quan Luna et al, 2012). Therefore, high priority should be given to this aspect when pushing the model development further;…”

Section: Resultsmentioning

confidence: 99%

Physically-based modelling of granular flows with Open Source GIS

Mergili

Schratz

Ostermann

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Computer models, in combination with Geographic Information Sciences (GIS), play an important role in up-to-date studies of travel distance, impact area, velocity or energy of granular flows (e.g. snow or rock avalanches, flows of debris or mud). Simple empirical-statistical relationships or mass point models are frequently applied in GISbased modelling environments. However, they are only appropriate for rough overviews at the regional scale. In detail, granular flows are highly complex processes and physicallybased, distributed models are required for detailed studies of travel distance, velocity, and energy of such phenomena. One of the most advanced theories for understanding and modelling granular flows is the Savage-Hutter type model, a system of differential equations based on the conservation of mass and momentum. The equations have been solved for a number of idealized topographies, but only few attempts to find a solution for arbitrary topography or to integrate the model with GIS are known up to now. The work presented is understood as an initiative to integrate a fully physicallybased model for the motion of granular flows, based on the extended Savage-Hutter theory, with GRASS, an Open Source GIS software package. The potentials of the model are highlighted, employing the Val Pola Rock Avalanche (Northern Italy, 1987) as the test event, and the limitations as well as the most urging needs for further research are discussed.

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Section: Resultsmentioning

confidence: 99%

Physically-based modelling of granular flows with Open Source GIS

Mergili

Schratz

Ostermann

et al. 2012

Nat. Hazards Earth Syst. Sci.

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“…Conociendo lo anterior, se puede especificar los parámetros que se determinan con mayor cuidado, ya que la incertidumbre en los valores redundará en cambios significativos en la respuesta. Para el análisis de sensibilidad, los parámetros se mantuvieron constantes (Tabla 1), excepto el parámetro elegido para la sensibilidad [12]. Los resultados se ven en la Figura 1.…”

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“…Existen diferentes aproximaciones propuestas en la literatura, basadas en la física mecánica y en reglas matemáticas para modelar los FMD [1,7,8,9,10,11,12]. Las leyes de la física son representadas por las ecuaciones de conservación de masa y conservación de momentum.…”

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Modelos para simulación de procesos de remoción en masa desagregados. Comparación con el método de talud infinito

Vela

Cañón

2012

Cien.Ing.Neogranadina

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RESUMENComo una forma alternativa a los métodos convencionales para analizar la estabilidad de taludes, este artículo implementa un procedimiento para modelar los flujos de material desagregado que parten de la mecánica de medios continuos (perspectiva Euleriana), propuesta por Iverson y Delinger [1]. Esta metodología supone el comportamiento de una mezcla de fluido newtoniano y sólido cuya interacción friccional se representa por la ley de fricción de Coulomb. La ecuación de momentum es simplificada de tal forma que permite generar una solución analítica, a la cual se le hizo un análisis de sensibilidad. Los resultados del análisis de sensibilidad muestran que los parámetros que más influyen en el modelo son: el ángulo de talud, el ángulo de fricción del lecho y la fracción de presión de poros, que a su vez, determinan la estabilidad del talud. Como ventaja adicional a los métodos usuales de estabilidad de taludes basados en equilibrio límite, el método implementado además de tener en cuenta el modo de deformación en campo, entrega el factor de seguridad, y lo más importante, calcula la velocidad de la masa deslizada y la distancia que recorre. Los resultados se pueden utilizar como insumo parcial para evaluar tanto la amenaza probabilística como la vulnerabilidad de infraestructura afectada por flujo de material desagregado.Palabras clave: flujos de material desagregado, estabilidad de taludes, método talud infinito.

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“…Often, well-documented avalanche and debris-flow events are back-calculated using numerical schemes supplemented by an entrainment law, to see which method produces the results most closely resembling the real events [20,24,30]. The drawback of this strategy is that the yield rate or entrained volume in the models is generally selected by the user, based on the events to be simulated, and this parameter is very difficult to estimate [15].…”

Section: State Of Current Entrainment Researchmentioning

confidence: 99%

Visualization of the internal flow properties and the material exchange interface in an entraining viscous Newtonian gravity current

2013

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In order to simulate a simple entraining geophysical flow, a viscous Newtonian gravity current is released from a reservoir by a dam-break and flows along a rigid horizontal bed until it meets a layer of entrainable material of finite depth, identical to the current. The goal is to examine the entrainment mechanisms by observing the interaction between the incoming flow and the loose bed. The sole parameter varied is the initial volume of the gravity current, thus altering its height and velocity. The gravity current plunges or spills into the entrainable bed and the velocity of the flow front becomes linear with time. The bed material is directly affected: motion is generated in the fluid far downstream of, and in that lying beneath the encroaching front. Shear bands are identified, separating horizontal flow downstream from flow with a strong vertical component close to the step. Downstream of the step the flow is horizontal and stratified, with no slip on the bottom boundary and very low shear near the surface. Between these two regions may lie transitional zones with linear velocity profiles, separated by horizontal bands of high shear; the number of transitional zones in the cross-section varies with the initial volume of the dam-break.

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Analysis of debris flow behavior with a one dimensional run-out model incorporating entrainment

Cited by 147 publications

References 46 publications

Physically-based modelling of granular flows with Open Source GIS

Physically-based modelling of granular flows with Open Source GIS

Modelos para simulación de procesos de remoción en masa desagregados. Comparación con el método de talud infinito

Visualization of the internal flow properties and the material exchange interface in an entraining viscous Newtonian gravity current

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