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NOLIBF: Difference between revisions

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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.  
'''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.  


= 0 linear bottom friction law. The friction coefficient (FFACTOR) is specified below.
= 0  


= 1 quadratic bottom friction law. The friction coefficient (FFACTOR) is specified below.
= 1  


= 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). The required parameters (FFACTORMIN, HBREAK, FTHETA, FGAMMA)
= 2  
are specified below.






== Parameter Summary ==
== Parameter Summary ==
The following table is a summary of possible NTIP values, description, details, and other necessary input parameters and files.
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
! NOLIBF Value
! Description
! Description
! Details
! Details
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|-
|-
| 0
| 0
| No Astronomical Forcing
| linear bottom friction law
| -
| -
| [[NTIF]] = 0
| [[FFACTOR]]
|-
|-
| 1
| 1
| Astronomical Tidal Potential
| 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>
| -
| [[NTIF]] > 0
| [[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>
| 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]].
| 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]]
| [[FFACTORMIN]], [[HBREAK]], [[FTHETA]], [[FGAMMA]]
|}
|}


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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.
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.
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.


== References ==
== References ==
<references />
<references />

Revision as of 14:25, 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.

= 0

= 1

= 2


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 - FFACTOR
1 quadratic bottom friction law - 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.

References

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