Default Values¶

This page documents the hard-coded default values used throughout the Bellhop interface. These defaults are defined in the dataclasses defined in the aubellhop.constants module.

ModelDefaults¶

Field Name	Type	Default Value	Units	Description
`name_2d`	`str`	`"bellhop"`		Name of the class instance for the 2D model
`name_3d`	`str`	`"bellhop3d"`		Name of the class instance for the 3D model
`exe_2d`	`str`	`"bellhop.exe"`		Executable filename for the 2D model
`exe_3d`	`str`	`"bellhop3d.exe"`		Executable filename for the 3D model
`dim_2d`	`int`	`2`		Number of dimensions in the 2D model
`dim_3d`	`int`	`3`		Number of dimensions in the 3D model

EnvDefaults¶

Field Name	Type	Default Value	Units	Description
`attenuation_units`	`str`	`"frequency dependent"`		Attenuation units to define volume attenuation (when setting bottom_attenuation, etc)
`bottom_attenuation`	`float`	`0.1`	scale factor	When acousto-elastic bottom boundary condition is selected, this is the attenuation factor
`bottom_boundary_condition`	`str`	`"acousto-elastic"`		Standard boundary condition for seabed
`bottom_interp`	`str`	`"linear"`		Interpolation for bathymetry depths
`comment_pad`	`int`	`50`		Number of characters used before the comment in the constructed .env files.
`dimension`	`str`	`"2D"`		Dimension of simulation (2D, 2.5D, 3D)
`_dimension`	`int`	`2`		Dimension of model (2, 3)
`frequency`	`float`	`25000.0`	Hz	Frequency of sound propagation
`interference_mode`	`str`	`"coherent"`		Mode of interference when calculating transmission loss
`simulation_depth_scale`	`float`	`1.01`		Scaling factor on the maximum depth of the bathymetry to calculate the maximum simulation depth extent.
`simulation_range_scale`	`float`	`1.1`		Scaling factor on the maximum range of the receivers to calculate the maximum simulation range extent.
`simulation_cross_range_scale`	`float`	`2.0`		Scaling factor on the maximum cross range of the receivers (based on maximum bearing angle) to calculate the maximum simulation cross range extent.
`simulation_cross_range_min`	`float`	`10.0`	m	For very small bearing angles there may be numerical issues with a cross range size approaching zero. This parameter specifies the minimum cross range size of the simulation extent.
`soundspeed_interp`	`str`	`"linear"`		Interpolation for sound speed profile data
`surface_depth`	`float`	`0.0`	m	Depth of the surface. Should always be 0.0 for flat altimetry.
`surface_interp`	`str`	`"linear"`		Interpolation for altimetry surface depths
`volume_attenuation`	`str`	`"none"`		Type of volume attenuation to apply

MiscDefaults¶

Field Name	Type	Default Value	Units	Description
`beam_angle_halfspace`	`float`	`90.0`	deg
`beam_angle_fullspace`	`float`	`180.0`	deg
`beam_bearing_halfspace`	`float`	`90.0`	deg
`beam_bearing_fullspace`	`float`	`180.0`	deg
`density`	`float`	`1000.0`	kg/m^3	Constant density of the medium
`sound_speed`	`float`	`1500.0`	m/s	Constant speed of sound in the medium