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4.3.31. Surface Properties#
Parameters:
- sfr#
Surface fraction of grid area covered by this surface type
- Unit:
dimensionless
- Example:
0.14285714285714285
- emis#
Surface emissivity for longwave radiation
- Unit:
dimensionless
- Example:
0.95
- ohm_threshsw#
Summer/winter threshold based on temperature for OHM calculation
- Unit:
degC
- Example:
0.0
- ohm_threshwd#
Soil moisture threshold determining whether wet/dry OHM coefficients are applied
- Unit:
dimensionless
- Example:
0.0
- ohm_coef#
The
ohm_coefparameter group is defined by the Seasonal/Wetness OHM Coefficients structure.
- soildepth#
Depth of soil layer below surface for hydrological calculations, controlling sub-surface water storage and drainage processes. Site-specific value typically determined from soil surveys or borehole data
- Unit:
mm
- Default:
None (optional)
- soilstorecap#
Maximum water storage capacity of soil layer, representing total water holding capacity between field capacity and wilting point. Site-specific value dependent on soil texture, structure, and depth
- Unit:
mm
- Default:
None (optional)
- statelimit#
Minimum water storage capacity for state change
- Unit:
mm
- Example:
10.0
- wetthresh#
Surface wetness threshold for OHM calculations
- Unit:
dimensionless
- Example:
0.5
- sathydraulicconduct#
Saturated hydraulic conductivity of soil layer, controlling water drainage rate through fully saturated soil. Site-specific value determined from soil texture (higher for sandy, lower for clay); typically measured via laboratory or field infiltration tests
- Unit:
mm s-1
- Default:
None (optional)
- soildensity#
Bulk soil density
- Unit:
g cm^-3
- Default:
None (optional)
- waterdist#
Water distribution parameters
The
waterdistparameter group is defined by the Water Distribution structure.
- storedrainprm#
Storage and drain parameters
The
storedrainprmparameter group is defined by the Drainage Parameters structure.
- snowpacklimit#
Limit of snow that can be held on surface
- Unit:
mm
- Example:
10.0
- thermal_layers#
Thermal layers for the surface
The
thermal_layersparameter group is defined by the Thermal Layers structure.
- irrfrac#
Fraction of surface area that can be irrigated
- Unit:
dimensionless
- Example:
0.0
- ref#
The
refparameter group is defined by the Reference Info structure.
- alb#
Surface albedo
- Unit:
dimensionless
- Example:
0.1