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~~NOTOC~~
===== Solver Grounded Solver =====

==== General Informations ====
  * **Solver Fortran File:** ''GroundedSolver.f90''
  * **Solver Name:** ''GroundedSolver''
  * **Required Output Variable(s):** ''GroundedMask'' (user defined)  
  * **Required Input Variable(s):** Need to read the bedrock, which can be either a variable or a material parameter (default is the material parameter 'Min Zs Bottom')
  * **Optional Output Variable(s):** None
  * **Optional Input Variable(s):** None


==== Versions ====
The solver ''GroundedSolverInit'' has been suppressed (version 7078). Instead, the solver ''GroundedSolver'' should be executed twice (one before the simulation and one at each time step). 
==== General Description ====
The aim of these solvers is to compute a mask to qualify which part of the bed is grounded, which one is floating and which one belongs to the grounding line. The ''GroundedMask'' value is +1 where grounded, -1 where floating and 0 on the grounding line.

==== SIF contents ====
The required keywords in the SIF file for this solver are:

To initialise the ''GroundedMask'' variable
<code>
Solver 1
  Exec Solver = Before All
  Equation = "GroundedMask"
  Variable = "GroundedMask"
  Variable DOFs = 1
  Procedure = "ElmerIceSolvers" "GroundedSolver"
  ! Give a tolerance for the bedrock
  Toler = Real 1.0e-03
  
  ! DEFAULT: Bedrock is read in the material parameter "Min Zs Bottom"
  !! OR Use this keyword if the bedrock is given as a variable
  ! Bedrock Variable = String "bedrock"
  !! OR use this keyword if the bedrock is given as a material parameter
  ! Bedrock Material = String "Min Zb"  
End
</code>

To get the new value of ''GroundedMask''. To be executed just after the mesh update. 
<code>
Solver 15
  Equation = "GroundedMask"
  Variable = "GroundedMask"
  Variable DOFs = 1
  Procedure = "ElmerIceSolvers" "GroundedSolver"

  Toler = Real 1.0e-3

  ! DEFAULT: Bedrock is read in the material parameter "Min Zs Bottom"
  !! OR Use this keyword if the bedrock is given as a variable
  ! Bedrock Variable = String "bedrock"
  !! OR use this keyword if the bedrock is given as a material parameter
  ! Bedrock Material = String "Min Zb" 
End
</code>

The bedrock elevation is read through the keyword ''Min Zs Bottom'' which is in the ''Material'' section. Here ''bedrock'' is a variable which contains the bedrock elevation.
<code>
Material 1
  ...
  Min Zs Bottom = Equals bedrock
  Max Zs Bottom = Real 1.0e6
End
</code>

==== Examples ====
An example testing the Grounded solver can be found in ''[ELMER_TRUNK]/elmerice/Tests/Grounded''.  See also GL_MISMIP and Contact (also in the Tests directory).