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

Beguerı́a, Santiago; Asch, Th.W.J. van; Malet, Jean‐Philippe; Gröndahl, S.

doi:10.5194/nhess-9-1897-2009

Cited by 157 publications

(120 citation statements)

References 50 publications

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“…Another approach relies on user-specified erosion layer properties (Beguería et al, 2009;Hungr and McDougall, 2009;Hussin et al, 2012) where the user predefines the volume or depth of eroded sediment. An example for this model type was implemented by Hussin et al (2012) within the RAMMS 2-D debris flow runout model .…”

Section: F Frank Et Al: the Importance Of Entrainment And Bulking Omentioning

confidence: 99%

The importance of entrainment and bulking on debris flow runout modeling: examples from the Swiss Alps

Frank

McArdell

Huggel

et al. 2015

Nat. Hazards Earth Syst. Sci.

130

137

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Abstract. This study describes an investigation of channelbed entrainment of sediment by debris flows. An entrainment model, developed using field data from debris flows at the Illgraben catchment, Switzerland, was incorporated into the existing RAMMS debris-flow model, which solves the 2-D shallow-water equations for granular flows. In the entrainment model, an empirical relationship between maximum shear stress and measured erosion is used to determine the maximum potential erosion depth. Additionally, the average rate of erosion, measured at the same field site, is used to constrain the erosion rate. The model predicts plausible erosion values in comparison with field data from highly erosive debris flow events at the Spreitgraben torrent channel, Switzerland in 2010, without any adjustment to the coefficients in the entrainment model. We find that by including bulking due to entrainment (e.g., by channel erosion) in runout models a more realistic flow pattern is produced than in simulations where entrainment is not included. In detail, simulations without entrainment show more lateral outflow from the channel where it has not been observed in the field. Therefore the entrainment model may be especially useful for practical applications such as hazard analysis and mapping, as well as scientific case studies of erosive debris flows.

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Section: F Frank Et Al: the Importance Of Entrainment And Bulking Omentioning

confidence: 99%

The importance of entrainment and bulking on debris flow runout modeling: examples from the Swiss Alps

Frank

McArdell

Huggel

et al. 2015

Nat. Hazards Earth Syst. Sci.

130

137

View full text Add to dashboard Cite

show abstract

“…Different types of rheology are implemented within a common numerical routing scheme in the model, which will be computed from a digital elevation model (DEM). The model uses a flexible time step based on a CFL (Courant-Friedrichs-Levy) condition in order to maintain the stability of the solution throughout the simulation (Begueria et al 2009). The model aims to create a user-friendly and practical environment while modeling by making its implementation in the open source GIS PCRaster (Karssenberg et al 2001).…”

Section: Model Descriptionmentioning

confidence: 99%

ASCHFLOW - A dynamic landslide run-out model for medium scale hazard analysis

Luna

Blahůt

Asch

et al. 2016

Geoenviron Disasters

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Background: Landslides hazard analyses entail a scale-dependent approach in order to mitigate accordingly the damages and other negative consequences at the respective scales of occurrence. Medium or large scale landslide run-out modelling for many possible landslide initiation areas has been a very difficult task in the past. This arises from the inability of the run-out models to compute the displacement with a large amount of individual initiation areas as it turns out to be computationally strenuous. Most of the existing physically based run-out models have difficulties in handling such situations. For this reason, empirical methods have been used as a practical mean to predict landslides mobility at a medium scale (1: 10,000 to 1: 50,000). They are the most widely used techniques to estimate the maximum run-out distance and affected zones not only locally but also regionally. In this context, a medium scale numerical model for flow-like mass movements in urban and mountainous areas was developed.

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“…Naef et al, 2006;Rickenmann et al, 2006;Hürlimann et al, 2008). Some of the rheological models frequently used to describe the behavior of debris flows are (e.g., Naef et al, 2006;Beguería et al, 2009;Hungr and McDougall, 2009): 1) the Coulomb frictional resistance; 2) the 15 Bingham model; 3) the Coulomb-Viscous; and (4) the Voellmy frictional-turbulent resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Dynamic continuum models rely on the application of conservation laws of mass, momentum and energy, and the behavior of the flow material is defined by its rheological properties (Dai et al, 2002;Quan Luna et al, 2012). One of the major challenges of the 10 dynamic approach is to select the most appropriate rheology to simulate the flow behavior as well as to correctly estimate or calibrate the model's key parameters (e.g., O'Brien et al, 1993;Beguería et al, 2009;Hsu et al, 2010;Scheidl et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Debris flow run-out simulation and analysis using a dynamic model

Melo¹,

Asch²,

Zêzere³

2017

Preprint

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Abstract.Only two months after a huge wildfire occurred in the upper part of a valley located in Central Portugal, several debris flows were triggered by intense rainfall. The event caused infrastructural and economical damage, although no life was lost. The present research aims to simulate the run-out of two debris flows occurred during the event as well as to calculate by back-analysis the rheological parameters and the excess rain involved. Thus, a dynamic model was used, which 10 integrates surface runoff, concentrated erosion along the channels, propagation and deposition of flow material. The rheological and entrainment parameters obtained for the most accurate simulation were then used to perform three scenarios of debris flows run-out at the basin scale. Due to the lack of quantitative information to validate these models, the results were compared with historical references of debris flow events in the study area. Six streams were identified, where debris flows occurred in the past and caused material damage and loss of lives. The worst-case scenario carried out at the basin 15 scale shows a potential inundation that may affect 345 buildings at the present day.

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

Cited by 157 publications

References 50 publications

The importance of entrainment and bulking on debris flow runout modeling: examples from the Swiss Alps

The importance of entrainment and bulking on debris flow runout modeling: examples from the Swiss Alps

ASCHFLOW - A dynamic landslide run-out model for medium scale hazard analysis

Debris flow run-out simulation and analysis using a dynamic model

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