Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2017-25
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Model evaluation paper
28 Feb 2017
Review status
This discussion paper is under review for the journal Geoscientific Model Development (GMD).
DebrisInterMixing-2.3: a finite volume solver for three-dimensional debris-flow simulations with two calibration parameters – Part 2: Model validation
Albrecht v. Boetticher1,3, Jens M. Turowski2, Brian W. McArdell3, Dieter Rickenmann3, Marcel Hürlimann4, Christian Scheidl5, and James W. Kirchner1,3 1Department of Environmental Systems Science, Swiss Federal Institute of Technology Zurich ETHZ, CHN H41, 8092 Zürich, Switzerland
2Helmholtz-Centre Potsdam GFZ German Research Center for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
3Swiss Federal Research Institute WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
4Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia UPC, Jordi Girona, 1-3 (D2), 08034 Barcelona, Spain
5Institute of Mountain Risk Engineering, BOKU, Peter-Jordan-Straße 82, 1190 Vienna, Austria
Abstract. Here we present validation tests of the fluid dynamic solver presented in in v. Boetticher et al. (2016), simulating both laboratory-scale and large-scale debris-flow experiments. The new solver combines a Coulomb viscosplastic rheological model with a Herschel-Bulkley model based on material properties and rheological characteristics of the analysed debris flow. For the selected experiments in this study, all necessary material properties were known – the content of sand, clay (including its mineral composition) and gravel (including its friction angle) as well as the water content. We show that given these measured properties, two model parameters are sufficient for calibration, and a range of experiments with different material compositions can be reproduced by the model without recalibration. One calibration parameter, the Herschel–Bulkley exponent, was kept constant for all simulations. The model validation focuses on different case studies illustrating the sensitivity of debris flows to water and clay content, channel curvature, channel roughness and the angle of repose. We characterize the accuracy of the model using experimental observations of flow head positions, front velocities, run-out patterns and basal pressures.

Citation: v. Boetticher, A., Turowski, J. M., McArdell, B. W., Rickenmann, D., Hürlimann, M., Scheidl, C., and Kirchner, J. W.: DebrisInterMixing-2.3: a finite volume solver for three-dimensional debris-flow simulations with two calibration parameters – Part 2: Model validation, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2017-25, in review, 2017.
Albrecht v. Boetticher et al.
Albrecht v. Boetticher et al.
Albrecht v. Boetticher et al.

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Short summary
The open source fluid dynamic solver presented in v. Boetticher et al. (2016) combines a Coulomb viscosplastic rheological model with a Herschel-Bulkley model based on material properties for 3D debris flow simulations. Here we validate the solver and illustrate the model sensitivity to water content, channel curvature, content of fine material and channel bed roughness by simulating both laboratory-scale and large-scale debris-flow experiments.
The open source fluid dynamic solver presented in v. Boetticher et al. (2016) combines a Coulomb...
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