crane¶

The landice/crane test group includes a test case for creating a mesh for Crane Glacier, Antarctica. The optimization for basal friction happens outside of COMPASS because it requires expert usage and takes a larger amount of computing resources than COMPASS is typically run with.

The test group includes a single test case that creates the variable resolution mesh.

config options¶

The test group uses the following default config options. At this point only the mesh generation options are adjusted through the config file.

# config options for mesh_gen test case
[mesh]

# number of levels in the mesh
levels = 10

# Bounds of Crane regional mesh
x_min = -2.442e6
x_max = -2.246e6
y_min = 1.124e6
y_max = 1.334e6

# distance from ice margin to cull (km).
# Set to a value <= 0 if you do not want
# to cull based on distance from margin.
cull_distance = -1.0

# mesh density parameters
# minimum cell spacing (meters)
min_spac = 5.e2
# maximum cell spacing (meters)
max_spac = 1.e3
# log10 of max speed for cell spacing
high_log_speed = 2.5
# log10 of min speed for cell spacing
low_log_speed = 0.75
# distance at which cell spacing = max_spac
high_dist = 1.e5
# distance within which cell spacing = min_spac
low_dist = 5.e4

# mesh density parameters used if use_bed = True
# These settings are taken from the Humboldt mesh
# and have not yet been evaluated for Crane.
# distance at which bed topography has no effect
high_dist_bed = 1.e5
# distance within which bed topography has maximum effect
low_dist_bed = 5.e4
# Bed elev beneath which cell spacing is minimized
low_bed = 50.0
# Bed elev above which cell spacing is maximized
high_bed = 100.0

# mesh density functions
use_speed = True
use_dist_to_grounding_line = True
use_dist_to_edge = False
use_bed = False

mesh_gen¶

landice/crane/default creates a variable resolution mesh. The default is 500m-1km resolution with mesh density determined by observed ice speed and distance to grounding line. There is no model integration step.