Direct Determination of Rheological Characteristics of Debris Flow

Coussot, Philippe; Laigle, Dominique; Arattano, M.; Deganutti, Andrea M.; Marchi, Lorenzo

doi:10.1061/(asce)0733-9429(1998)124:8(865)

Cited by 150 publications

(89 citation statements)

References 22 publications

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“…The rheological coefficients can in some cases be estimated with field observations (e.g. Laigle et al, 2003) or in the laboratory (Coussot et al, 1998). The singlephase approach to describe debris flows ignores experimental evidence of dynamic pressures arising from the grain collisions in granular flows (Iverson, 1997) which suggests that rheological relations that do not include such normal stress effects are an oversimplification.…”

Section: Discussionmentioning

confidence: 99%

Comparison of flow resistance relations for debris flows using a one-dimensional finite element simulation model

Naef

Rickenmann

Rutschmann

et al. 2006

Nat. Hazards Earth Syst. Sci.

143

108

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Abstract. This paper describes a one-dimensional finite element code for debris flows developed to model the flow within a steep channel and the stopping conditions on the fan. The code allows the systematic comparison of a wide variety of previously proposed one-phase flow resistance laws using the same finite element solution method. The onedimensional depth-averaged equations of motion and the numerical model are explained. The model and implementation of the flow resistance relations was validated using published analytical results for the dam break case. Reasonable agreement for the front velocities and stopping location for a debris-flow event in the Kamikamihori torrent in Japan can be achieved with turbulent flow resistance relations including "stop" terms which allow the flow to come to rest on a gently sloping surface. While it is possible to match the overall bulk flow behavior using relatively simple flow resistance relations, they must be calibrated. A sensitivity analysis showed that the shape of the upstream input hydrograph does not much affect the flow conditions in the lower part of the flow path, whereas the event volume is much more important.

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Section: Discussionmentioning

confidence: 99%

Comparison of flow resistance relations for debris flows using a one-dimensional finite element simulation model

Naef

Rickenmann

Rutschmann

et al. 2006

Nat. Hazards Earth Syst. Sci.

143

108

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“…In our simulation the value of this ratio was 1.25. Rickenmann et al (2006) kept the µ/τ C ratio constant at 1/3, following Coussot et al (1998). We found that the optimum value for this ratio was slightly lower, at approximately 1/5.…”

Section: The Event Of 16 August 1997 In the Wartschenbach Torrentmentioning

confidence: 89%

A GIS-based numerical model for simulating the kinematics of mud and debris flows over complex terrain

Beguerı́a

Asch

Malet

et al. 2009

Nat. Hazards Earth Syst. Sci.

160

110

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Abstract.This article presents MassMov2D, a twodimensional model of mud and debris flow dynamics over complex topography, based on a numerical integration of the depth-averaged motion equations using a shallow water approximation. The core part of the model was implemented using the GIS scripting language PCRaster. This environment provides visualization of the results through map animations and time series, and a user-friendly interface. The constitutive equations and the numerical solution adopted in MassMov2D are presented in this article. The model was applied to two field case studies of mud flows on torrential alluvial fans, one in the Austrian Tyrol (Wartschenbach torrent) and the other in the French Alps (Faucon torrent). Existing data on the debris flow volume, input discharge and deposits were used to back-analyze those events and estimate the values of the leading parameters. The results were compared with modeling codes used by other authors for the same case studies. The results obtained with MassMov2D matched well with the observed debris flow deposits, and are in agreement with those obtained using alternative codes.

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“…Other numerical models were developed during the last two decades based on different assumptions [14][15][16][17][18][19]. Studies and researches on critical conditions of bed sediment entrainment due to debris flow, factors triggering debris flow, the determination of rheological characteristics of debris flow, configurations of debris-flow fan and run-out distances, based on flume tests, numerical and dimensional analysis, has also been carried out in Italy by many Authors [20][21][22][23][24][25][26].…”

Section: Hydraulic Studies On Debris Flowsmentioning

confidence: 99%

Research developments in debris flow monitoring, modelling and hazard assessment in Italian mountain catchments

Lenzi¹

2006

WIT Transactions on Ecology and the Environment, Vol 90

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Debris flows play an important role among natural hazards in the mountainous areas of Italy. This paper provides an overview of the recent research on debris flows conducted in Italy, taking into account both hydraulic and morphological studies. Moreover, the most encouraging research perspectives in this field are briefly presented, such as the monitoring in instrumented basins, the geotechnical analysis of the processes leading to debris flow initiation and modelling. Finally, three study cases are reported, with the aim of outlining the main characteristics of these phenomena and the consequent risk conditions in representative sites in the Italian mountains.

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Direct Determination of Rheological Characteristics of Debris Flow

Cited by 150 publications

References 22 publications

Comparison of flow resistance relations for debris flows using a one-dimensional finite element simulation model

Comparison of flow resistance relations for debris flows using a one-dimensional finite element simulation model

A GIS-based numerical model for simulating the kinematics of mud and debris flows over complex terrain

Research developments in debris flow monitoring, modelling and hazard assessment in Italian mountain catchments

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