Initialize sandbox geometry.

Keyword arguments:

• nsand_layers::Int:
  • Number of sand layers used in sandbox extension and shortening models
• y_sand_air_interface::Float64:
  • Y-location in meters of interface between sand and air along the left boundary used in sandbox extension and shortening models
• y_top_microbeads::Union{Float64, Nothing}:
  • Y-location in meters of top of microbeads used in sandbox shortening models
• y_bottom_microbeads::Union{Float64, Nothing}:
  • Y-location in meters of bottom of microbeads used in sandbox shortening models
• x_left_ramp::Union{Float64, Nothing}:
  • X-location in meters of left-edge of ramp used in sandbox shortening models
• x_right_ramp::Union{Float64, Nothing}:
  • X-location in meters of right-edge of ramp used in sandbox shortening models
• ramp_dip_deg::Union{Float64, Nothing}:
  • Dip of ramp in degrees used in sandbox shortening models used in sandbox shortening models
• pdms_layer_width::Union{Float64, Nothing}:
  • Width in meters of PDMS (polydimethylsiloxane) layer located in the central bottom part of model used in sandbox extension models
• pdms_layer_thickness::Union{Float64, Nothing}:
  • Thickness in meters of PDMS (polydimethylsiloxane) layer used in sandbox extension models