Avaframe com1DFA (version 1.3): a thickness integrated computational avalanche module – Theory, numerics and testing
Abstract. Simulation tools are important to investigate and predict mobility and the destructive potential of gravitational mass flows (e.g. snow avalanches). AvaFrame – the open avalanche framework – offers well established computational modeling approaches, tools for data handling and analysis as well as ready to use modules for evaluation and testing. This paper presents the theoretical background, derivation and model verification for one of AvaFrame’s core modules, the thickness integrated computational model for dense flow avalanches, named com1DFA. Particular emphasis within the description of the utilized numerical particle grid method is given to the computation of spatial gradients and the accurate implementation of driving and resisting forces. The implemented method allows to provide a time-space criterion connecting the numerical particles, grid and time discretization. The convergence and robustness of the numerical implementation is checked with respect to the spatio-temporal evolution of the flow variables using tests with a known analytical solution. In addition we present a new test for verifying the accuracy of the numerical simulation in terms of runout (angle and distance). This test is derived from the total energy balance along the center of mass path of the avalanche. This manuscript, particularly in combination with the code availability (open-source code repository) and detailed online documentation provides a description of an extendable framework for modeling and verification of avalanche simulation tools.
Matthias Tonnel et al.
Status: final response (author comments only)
- RC1: 'Review of the discussion paper egusphere-2022-1291', Anonymous Referee #1, 16 Mar 2023
- RC2: 'Comment on egusphere-2022-1291', Dieter Issler, 11 Apr 2023
- AC1: 'Authors reply on referee comments for egusphere-2022-1291', Felix Oesterle, 07 Jun 2023
Matthias Tonnel et al.
Matthias Tonnel et al.
Viewed (geographical distribution)
The authors present, describe, and evaluate a simulation module for dense flow avalanches (com1DFA) implemented within the newly developed, flexible Avaframe mass flow simulation framework. After a detailed presentation of the physical basis and numerical implementation of the tool, it is verified through two benchmark tests against semi-analytical solutions on a simple topography and a dam break scenario. The work is highly relevant from both a scientific and a practical perspective, and is certainly suitable for the journal. The manuscript is well-organized and well-written, with appropriate and informative illustrations. The methodical part targets very much at an audience with a strong mathematical background (which is fine for this type of model description paper) but will be hard to follow for anyone else. I would certainly like to see the work published. Before, I recommend some minor revisions. Please find below my comments and suggestions.
L23f: “… combining over a decade of operational application …”: This formulation is not very clear, maybe better mention that this operational application refers to SamosAT?
L42: “… proposed in Mangeney-Castelnau et al. (2003), …”
L64: It is not clear to me how the word “AvaFrame” fits in this sentence. Further, the “F”in “AvaFrame” is written in upper case here and in other places in the manuscript, but in lower case in the title of the paper. Please ensure consistency, or explain why there is this difference.
L71: Maybe I overlooked it – did you introduce the abbreviation “DFA” before? It is very clear what it means, but still it has to be defined.
L144f: Please check brackets in the reference to the Voellmy model.
L255: I am not a native speaker, but “… using such an SPH method …” might be better.
L256: “… previously described grid method …”
L311: “… used in the com1DFA code …”
L321f: Shouldn’t the DEM also be described by the number of cells in x and y direction?
L400: Maybe better: “… a (semi-)analytical solution …”. But I am not sure, it is a tricky issue.
L411: The similarity solution and dam break tests come very sudden here (not mentioned before). Maybe better reformulate this sentence a little bit.
L437: Is this really a dam break? I would rather describe it as the collapse of a cliff. Shouldn’t a dam break imply that there is some fluid behind, which is released?
L474: “… between analytical and numerical solution …”
L480: “… with an α exponent …”
L481f: “… α = 0 for the dam break test …”
Figure 4, header: “Similarity solution test …”
L493: “… only Coulomb friction …”
L541: “… and questions like …”
L562: “The results of these tests …”
L569: “at the date of publication of this manuscript”: this formulation sounds somehow strange to me, better reformulate.
L590: Better: “… throughout the development.”
L591: “Note that the computational efficiency …”
L596f: “feed back” --> “feedback”