def compute(self, grid):
tauc = PISM.IceModelVec2S(grid, "tauc", PISM.WITHOUT_GHOSTS)
tauc.set(0.0)
enthalpy = PISM.IceModelVec3(grid, "enthalpy", PISM.WITHOUT_GHOSTS,
grid.z())
enthalpy.set(0.0)
Mz = 2
coarsening_factor = 1
model = PISM.BlatterTestvanderVeen(grid, Mz, coarsening_factor)
geometry = PISM.Geometry(grid)
# low enough to make it grounded
sea_level = -100.0
with PISM.vec.Access(
[geometry.ice_thickness, geometry.bed_elevation, tauc]):
for (i, j) in grid.points():
X = grid.x(i)
geometry.ice_thickness[i, j] = model.H_exact(X)
geometry.bed_elevation[i, j] = model.b_exact(X)
tauc[i, j] = model.beta_exact(X)
geometry.sea_level_elevation.set(sea_level)
geometry.ensure_consistency(0.0)
model.init()
inputs = PISM.StressBalanceInputs()
inputs.geometry = geometry
inputs.basal_yield_stress = tauc
inputs.enthalpy = enthalpy
model.update(inputs, True)
return model
