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Difference between revisions of "NOLIBF"

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(Created page with "'''NOLIBF''' is an input in the fort.15 file that selects the astronomical forcing input type. == Parameter Summary == The following table is a summary of possible NTIP...")
 
 
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'''NOLIBF''' is an input in the [[fort.15 file]] that selects the astronomical forcing input type.  
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'''NOLIBF''' is a parameter in the [[fort.15 file]] controlling the type of bottom stress parameterization used in a 2DDI ADCIRC run. This parameter must be specified but is ignored in a 3D run.  
  
 
== Parameter Summary ==
 
== Parameter Summary ==
The following table is a summary of possible NTIP values, description, details, and other necessary input parameters and files.
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The following table is a summary of possible NOLIBF values, description, details, and other necessary input parameters and files.
  
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
! NTIP Value
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! NOLIBF Value
 
! Description
 
! Description
 
! Details
 
! Details
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|-
 
|-
 
| 0
 
| 0
| No Astronomical Forcing
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| linear bottom friction law
| -
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| uses a spatially constant linear bottom friction, <math>\tau_b</math> of dimensions [1/T]
| [[NTIF]] = 0
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| [[FFACTOR]]
 
|-
 
|-
 
| 1
 
| 1
| Astronomical Tidal Potential
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| quadratic bottom friction law
| Reconstructs the tidal elevation using the analytical formulation for the equilibrium tidal potential<ref name=tp>Eq. (27), page 17 in Luettich, R.A., Westerink, J.J., 1992. ADCIRC: an advanced three-dimensional circulation model for shelves coasts and estuaries, report 1: theory and methodology of ADCIRC-2DDI and ADCIRC-3DL, Dredging Research Program. Vicksburg, MS.</ref>
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| can specify a spatially constant or spatially varying dimensionless coefficient, <math>C_f</math>; in which <math>\tau_b = C_f|U|/H</math>
| [[NTIF]] > 0
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| [[FFACTOR]]
 
|-
 
|-
 
| 2
 
| 2
| Astronomical Tidal Potential plus Self-attraction and Loading (SAL) Tide<ref name=Ray>Ray, R.D., 1998. Ocean self-attraction and loading in numerical tidal models. Mar. Geod. 21, 181–192. doi:10.1080/01490419809388134</ref>
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| hybrid nonlinear bottom friction law
| Reconstructs the tidal elevation by summing the contribution from the analytical formulation for the equilibrium tidal potential<ref name=tp></ref> with the contribution from the prescribed SAL constituent values found in the [[fort.24 file]].
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| In deep water, the friction coefficient is constant and a quadratic bottom friction law results. In shallow water the friction coefficient increases as the depth decreases (e.g. as in a Manning-type friction law). The friction coefficient is determined as: FFACTOR=FFACTORMIN*[1+(HBREAK/H)**FTHETA]**(FGAMMA/FTHETA)
| [[NTIF]] > 0, [[fort.24 file]]
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| [[FFACTORMIN]], [[HBREAK]], [[FTHETA]], [[FGAMMA]]
 
|}
 
|}
  
== References ==
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== Usage Notes ==  
<references />
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In the [[NWP]] section, if the user selects quadratic_friction_coefficient_at_sea_floor, mannings_n_at_sea_floor, or chezy_friction_coefficient_at_sea_floor, then NOLIBF must be 1 (nonlinear friction formulation) since all those formulations are nonlinear. If the NOLIBF were anything other than 1, it is an error that will cause ADCIRC to stop.
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For 3D ADCIRC runs, spatially varying bottom friction should be specified using the [[Fort.13_file#Bottom_Roughness|bottom_roughness_length]] [[fort.13 file]] nodal attribute.

Latest revision as of 18:31, 3 April 2020

NOLIBF is a parameter in the fort.15 file controlling the type of bottom stress parameterization used in a 2DDI ADCIRC run. This parameter must be specified but is ignored in a 3D run.

Parameter Summary

The following table is a summary of possible NOLIBF values, description, details, and other necessary input parameters and files.

NOLIBF Value Description Details Other Required Inputs
0 linear bottom friction law uses a spatially constant linear bottom friction, of dimensions [1/T] FFACTOR
1 quadratic bottom friction law can specify a spatially constant or spatially varying dimensionless coefficient, ; in which FFACTOR
2 hybrid nonlinear bottom friction law In deep water, the friction coefficient is constant and a quadratic bottom friction law results. In shallow water the friction coefficient increases as the depth decreases (e.g. as in a Manning-type friction law). The friction coefficient is determined as: FFACTOR=FFACTORMIN*[1+(HBREAK/H)**FTHETA]**(FGAMMA/FTHETA) FFACTORMIN, HBREAK, FTHETA, FGAMMA

Usage Notes

In the NWP section, if the user selects quadratic_friction_coefficient_at_sea_floor, mannings_n_at_sea_floor, or chezy_friction_coefficient_at_sea_floor, then NOLIBF must be 1 (nonlinear friction formulation) since all those formulations are nonlinear. If the NOLIBF were anything other than 1, it is an error that will cause ADCIRC to stop.

For 3D ADCIRC runs, spatially varying bottom friction should be specified using the bottom_roughness_length fort.13 file nodal attribute.