Tool MshGlacierDEM

* Source Fortran File: MshGlacierDEM.f90

NEW: since version 6626, works for parallel meshes (Warning, the mesh_input.dat has to be modified, also for serial mesh)

This tool deforms vertically a 1m thick 3D mesh to conform with the bedrock and surface elevations given as DEMs. Informations (name and grid definition) of the bedrock and surface DEMs are given is the file mesh_input.dat. This file reads:

! Name of the mesh directory (should exist)
WithOutCavity
! Surface DEM name file
DEM_TR_surf.dat
! Nsx, Nsy
268  118
! xs0, ys0
947700.0 2104850.0
! lsx, lsy
800.0 350.0
! Bedrock DEM name file
DEM_TR_bed.dat
! Nbx, Nby
301  176
! xb0, yb0
947700.0 2104850.0
! lbx, lby
600.0 350.0
! Minimum ice thickness
1.0
! Number of Partitions
1

The parameter Minimum ice thickness sets a minimum ice thickness to ensure strictly positive volume of the elements. The parameter Number of Partitions is 1 for a serial mesh and equals to the number of partitions for a partitioned mesh.

Nodal value of elevation are estimated from the bedrock and surface DEMs using bilinear interpolation. The DEMs are given as 2D regular grid in an ASCII file (x y z). The data in the ASCII file have to be ordered such that

  x1 y1 z11
  x2 y1 z21
  ...
  xn y1 zn1
  x1 y2 z12
  ...
  xn yn znn 

The grid is described by giving:

  • (x0, y0) the left-bottom corner coordinate
  • (lx, ly) the x and y lengths of the covered domain
  • (Nx, Ny) the number of cells in x and y directions
  • No data are given by -9999

An example using MshGlacierDEM to construct Tête Rousse glacier mesh can be found in [ELMER_TRUNK]/elmerice/examples/Test_MshGlacierDEM for both a Serial and a Partitioned meshes.

mesh/mshdem.txt · Last modified: 2014/03/26 12:37 by gag
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