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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmd-2020-101
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-101
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 25 Jun 2020

Submitted as: model description paper | 25 Jun 2020

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This preprint is currently under review for the journal GMD.

Towards a model for structured mass movements: the OpenLISEM Hazard model 2.0a

Bastian van den Bout1, Theo W. J. van Asch2, Wei Hu2, Chenxiao Tang3, Olga Mavrouli1, Victor G. Jetten1, and Cees J. van Westen1 Bastian van den Bout et al.
  • 1University of Twente, Faculty of Geo-Information Science and Earth Observation, the Netherlands
  • 2Chengdu university of Technology, State key Laboratory of Geohazard Preventaionand GeoEnvironment Protection, China
  • 3Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, China

Abstract. Mass movements such as debris flows and landslide differ in behavior due to their material properties and internal forces. Models employ generalized multi-phase flow equations to adaptively describe these complex flow types. However, models commonly assume unstructured and fragmented flow after initiation of movement. In this work, existing work on two-phase mass movement equations are extended to include a full stress-strain relationship that allows for runout of (semi-) structured fluid-solid masses. The work provides both the three-dimensional equations and depth-averaged simplifications. The equations are implemented in a hybrid Material Point Method (MPM) which allows for efficient simulation of stress-strain relationships on discrete smooth particles. Using this framework, the developed model is compared to several flume experiments of clay blocks impacting fixed obstacles. Here, both final deposit patterns and fractures compare well to simulations. Additionally, numerical tests are performed to showcase the range of dynamical behavior produced by the model. Important processes such as fracturing, fragmentation and fluid release are captured by the model. While this provides an important step towards complete mass movement models, several new opportunities arise such as ground-water flow descriptions and application to fragmenting mass movements and block-slides.

Bastian van den Bout et al.

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Status: open (until 20 Aug 2020)
Status: open (until 20 Aug 2020)
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Bastian van den Bout et al.

Model code and software

OpenLISEM Hazard 2.0 alpha B. van den Bout https://github.com/bastianvandenbout/OpenLISEM-Hazard-2.0-Pre-Release

Bastian van den Bout et al.

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Latest update: 10 Jul 2020
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Short summary
Landslides, debris flows and other types of dense gravity-driven flows threaten livelihoods around the globe. Understanding the mechanics of these flows can be crucial for predicting their behavior and reducing disaster risk. Numerical models assume that the solids and fluids of which the flow exists are unstructured. In the presented model captures the internal structure during movement. This important step might lead to more accurate predictions of landslide movement.
Landslides, debris flows and other types of dense gravity-driven flows threaten livelihoods...
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