dissipation2D Section

This section configures 2D dissipation parameters, including bottom friction, horizontal viscosity, and Smagorinsky coefficients.

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Parameter	Description
background_velocity_mode	Mode for background velocity (UNDEFINED, UNIFORM, POLYGONS, RASTER, NODEFILE).
min_background_speed	Minimum background speed (default: 0.05 m/s).
BKG_polygones	File for background velocity polygons.
BKG_values	File for background velocity values.
background_velocity_file	File for background velocity.
bottom_friction_type	Type of bottom friction (LINEAR, QUADRATIC_CD, QUADRATIC_Z0, QUADRATIC_MANNING).
linear_friction_coeff	Linear bottom friction coefficient (default: 2.5e-3, dimensionless).
quadratic_friction_coeff	Quadratic bottom friction coefficient (default: 2.5e-3, dimensionless).
QFC_polygones	File for quadratic friction coefficient polygons.
QFC_values	File for quadratic friction coefficient values.
bottom_coeff_file	File for prescribed bottom friction coefficient (LGP1 discretization).
roughness_length	Equivalent roughness length for quadratic bottom friction (default: 1.0e-4 m).
min_quadratic_friction_coeff	Minimum value for Cd when using roughness formulation (default: -999, dimensionless).
QFCM_polygones	File for minimum quadratic friction coefficient polygons.
QFCM_values	File for minimum quadratic friction coefficient values.
bottom_rugosity_file	File for prescribed roughness length (LGP1 discretization).
rugosity_polygones	File for rugosity polygons.
rugosity_values	File for rugosity values.
rugosity_values_by_regions	File for rugosity values by regions.
manning_coefficient	Manning coefficient (default: 1.e-02, dimensionless).
manning_coefficient_file	File for prescribed Manning coefficient (LGP1 discretization).
localized_parameters_echoing	Flag to echo localized parameters (TRUE, FALSE).
viscous_friction_coeff	Viscous bottom friction coefficient (default: 1.18e-4, dimensionless).
internal_drag_algorithm	Algorithm for internal drag (0, 1, 2, 3, 4, 5).
internal_drag_slope	Slope for internal drag (default: 0.00, dimensionless).
internal_drag_hmin	Minimum depth for internal drag (default: 300, dimensionless).
internal_drag_hmax	Maximum depth for internal drag (default: 500, dimensionless).
internal_drag_polygones	File for internal drag polygons.
internal_drag_values	File for internal drag values.
internal_drag_values_by_regions	File for internal drag values by regions.
internal_drag_rugosity	Rugosity for internal drag (default: 0.00, dimensionless).
mixed_layer_coeff	Mixed layer coefficient (default: 0.00 m/s).
horizontal_viscosity_mode	Mode for horizontal viscosity (NONE, SMAGORINSKY, PROPORTIONAL, CONSTANT, SMAGORINSKY-2D).
min_horizontal_viscosity	Minimum horizontal viscosity (default: 1.00 m²/s).
max_horizontal_viscosity	Maximum horizontal viscosity (default: 1000.00 m²/s).
smagorinsky_coefficient	Smagorinsky coefficient (default: 0.28, dimensionless).
smagorinski_coefficient_polygons	File for Smagorinsky coefficient polygons.
smagorinski_coefficient_values	File for Smagorinsky coefficient values.
lateral_friction_type	Type of lateral friction (LINEAR, QUADRATIC_CD).
lateral_friction_linear_coeff	Linear lateral friction coefficient (default: 1.0e-3, dimensionless).
shear_drag_flag	Flag to enable/disable dissipation in mixing layer (TRUE, FALSE).
brunt_vassalla_value	Brunt-Väisälä value (default: 0.002 s).
brunt_vassalla_file	File for local Brunt-Väisälä values.