The finite-element method (FEM) is one of the main numerical analysis methods in continuum mechanics and mechanics of solids (Reference Huebner, Dewhirst, Smith and ByromHuebner and others, 2001). Through mesh discretization of a given continuous domain into a finite number of sub-domains, or elements, the method finds approximate solutions to sets of simultaneous partial differential equations, which express the behavior of the elements and the entire system. For decades this methodology has played an accelerated role in mechanical engineering, structural analysis and, in particular, snow mechanics. To the best of our knowledge, the application of finite-element analysis in snow mechanics has never been summarized. Therefore, in this correspondence we provide a table with a detailed review of the main FEM studies on snow mechanics performed from 1971 to 2012 (40 papers), for facilitating comparison between different mechanical approaches, outlining numerical recipes and for future reference. We believe that this kind of compact review in a tabulated form will produce a snapshot of the state of the art, and thus become an appropriate, timely and beneficial reference for any relevant follow-up research, including, for example, not only snow avalanche questions, but also modeling of snow microstructure and tire–snow interaction. To that end, this correspondence is organized according to the following structure. Table 1 includes all essential information about previously published FEM studies originally developed to investigate stresses in snow with all corresponding mechanical and numerical parameters. Columns in Table 1 provide references to particular studies, placed in chronological order. Rows correspond to the main model parameters and other details of each considered case.
In order to give an overview of the studies covered by this review, we briefly summarize them below. Previously considered physical and engineering problems in snow mechanics can be roughly separated into several major categories, namely:
state of strain and stress in snowpack on slope, snow creep and compaction (Reference Smith, Sommerfeld and BaileySmith and others, 1971; Reference SmithSmith, 1972; Reference Curtis and SmithCurtis and Smith, 1974; Reference Smith and CurtisSmith and Curtis, 1975; Reference Lang and SommerfeldLang and Sommerfeld, 1977; Reference JohnsonJohnson, 1998; Reference Bartelt, Christen, Hutter, Wang and BeerBartelt and Christen, 1999; Reference Bartelt, Christen, Wittwer, Hjorth-Hansen, Holand, Løset and NoremBartelt and others, 2000; Reference TeufelsbauerTeufelsbauer, 2009, Reference Teufelsbauer2011);
influence of snow weak layer and subcritical weak spots on the mechanical state of snowpack and slab avalanche release (Reference McClungMcClung, 1979; Reference SinghSingh, 1980; Reference Bader and SalmBader and Salm, 1990; Reference Bartelt, Christen, Hutter, Wang and BeerBartelt and Christen, 1999; Reference Stoffel and BarteltStoffel and Bartelt, 2003; Reference StoffelStoffel, 2005; Reference Gaume, Chambon, Naaim, Eckert, Bonelli, Dascalu and NicotGaume and others, 2011, Reference Gaume, Chambon, Eckert and Naaim2012);
skier loadings on inclined snowpack (Reference SchweizerSchweizer, 1993; Reference Wilson, Schweizer, Johnson and JamiesonWilson and others, 1999; Reference Jones, Jamieson, Schweizer and GleasonJones and others, 2006; Reference Habermann, Schweizer and JamiesonHabermann and others, 2008; Reference Mahajan, Kalakuntla and ChandelMahajan and others, 2010);
shock loading and explosive loading on snowpack (Reference Johnson, Solie, Brown and GaffneyJohnson and others, 1993; Reference Miller, Tichota and AdamsMiller and others, 2011);
reproduction of mechanical experiments for studying fundamental rheological properties of snow (Mohamed and others, 1993; Reference Meschke, Liu and MangMeschke and others, 1996; Reference Jamieson and JohnstonJamieson and Johnston, 2001; Reference Haehnel and ShoopHaehnel and Shoop, 2004; Reference Cresseri and JommiCresseri and Jommi, 2005; Reference Cresseri, Genna and JommiCresseri and others, 2010);
forces exerted by snow cover on avalanche defense structures (Reference Bartelt, Christen, Hutter, Wang and BeerBartelt and Christen, 1999; Reference Bartelt, Christen, Wittwer, Hjorth-Hansen, Holand, Løset and NoremBartelt and others, 2000; Reference StoffelStoffel, 2005; Reference TeufelsbauerTeufelsbauer, 2011);
fracture properties of snow and snow slabs, crack propagation (Reference Bažant, Zi and McClungBažant and others, 2003; Reference Mahajan and SenthilMahajan and Senthil, 2004; Reference StoffelStoffel, 2005; Reference Sigrist, Schweizer, Schindler and DualSigrist and others, 2006; Reference Sigrist and SchweizerSigrist and Schweizer, 2007; Reference Heierli, Gumbsch and ZaiserHeierli and others, 2008; Reference Mahajan and JoshiMahajan and Joshi, 2008);
tire/wheel–snow interaction (Reference Haehnel and ShoopHaehnel and Shoop, 2004; Reference LeeLee, 2009);
microstructure studies of snow volume obtained from X-ray microtomography (Reference Pieritz, Brzoska, Flin, Lesaffre and ColéouPieritz and others, 2004; Reference SchneebeliSchneebeli, 2004; Reference Srivastava, Mahajan, Satyawali and KumarSrivastava and others, 2010; Reference TheileTheile, 2010; Reference HagenmullerHagenmuller, 2011).
We have omitted some studies from Table 1 because sufficient detail was not available to us (e.g. Reference Navarre and DesruesNavarre and Desrues, 1980; Reference SinghSingh, 1980). Others are omitted because they did not focus purely on mechanics; for example, some studies using FEM for snow or firn studies were mainly dedicated to heat transfer (at the microstructural level or at the snow–permafrost boundary), air ventilation within pore space, water infiltration or metamorphism (Reference Christon, Burns and SomerfeldChriston and others, 1994; Reference Tseng, Illangasekare and MeierTseng and others, 1994; Reference Meussen, Mahrenholtz and OerterMeussen and others, 1999; Reference Phillips, Bartelt and ChristenPhillips and others, 2000; Reference Pielmeier, Schneebeli and StuckiPielmeier and others, 2001; Reference AlbertAlbert, 2002; Reference Bartelt, Buser and SokratovBartelt and others, 2004; Reference Kaempfer, Schneebeli and SokratovKaempfer and others, 2005). Still others focused on the transition from solid to fluid (Reference Daudon and DufourDaudon and Dufour, 2011) or the phase-tracking snow microstructure model (Reference Slaughter and ZabarasSlaughter and Zabaras, 2012). Finally, FEM papers on tire–snow interaction may be found in references within Reference Haehnel and ShoopHaehnel and Shoop (2004) and Reference LeeLee (2009).
We hope that the papers collected in this review will serve to facilitate comparison between and assimilation of different mechanical approaches or numerical recipes, and that they will be useful for solving the many remaining problems.
Acknowledgements
The research leading to these results has received funding from the International Affairs Directorate of IRSTEA (former name ‘Cemagref’), INTERREG ALCOTRA (MAP3), and from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007– 2013) under REA grant agreement No. 298672 (FP7- PEOPLE-2011-IIF, ‘TRIME’). E.A.P. is grateful for the support. We thank E.A. Hardwick for improving our English, and M. Schneebeli, P. Bartelt and T.H. Jacka for suggestions which gave birth to the final version of this correspondence.
19 September 2013