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 **The INTERFROST Project** **The INTERFROST Project**
  
-We propose here a benchmark exercise dealing with the “Subsurface thermal hydrologic processes” as presented by (Painter et al., 2012) or within the field of Cryohydrogeology (McKenzie et al. 2020) [[tc.copernicus.org/preprints/tc-2020-132/]]. In a first phase of the project we firstly limit our efforts to the more simple set of equations involving Darcy flow (fully saturated porous medium) coupled with heat transfer with advection and phase change. Extensions of the benchmark to Richard equations or including the air phase are considered for later phases of the project. +We propose here a benchmark exercise dealing with the “Subsurface thermal hydrologic processes” as presented by (Painter et al., 2012) or within the field of Cryohydrogeology (McKenzie et al. 2020) [[https://tc.copernicus.org/preprints/tc-2020-132/]]. In a first phase of the project we firstly limit our efforts to the more simple set of equations involving Darcy flow (fully saturated porous medium) coupled with heat transfer with advection and phase change. Extensions of the benchmark to Richard equations or including the air phase are considered for later phases of the project. 
  
 Phase I of the benchmark consists of some test cases inspired by existing literature (e.g. Mc Kenzie et al., 2007) as well as new ones. Some experimental cases in cold room will complement the validation approach. In view of a second phase, the benchmark project is open as well to new or alternative cases reflecting a numerical or a process oriented interest or answering a more general concern among the cold region community.  Phase I of the benchmark consists of some test cases inspired by existing literature (e.g. Mc Kenzie et al., 2007) as well as new ones. Some experimental cases in cold room will complement the validation approach. In view of a second phase, the benchmark project is open as well to new or alternative cases reflecting a numerical or a process oriented interest or answering a more general concern among the cold region community.