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NOLIFA: Difference between revisions

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(Created page with "'''NOLIFA''' is a parameter in the fort.15 file controlling the type of bottom stress parameterization used in a 2DDI ADCIRC run. == Parameter Summary == The following ta...")
 
 
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'''NOLIFA''' is a parameter in the [[fort.15 file]] controlling the type of bottom stress parameterization used in a 2DDI ADCIRC run.
'''NOLIFA''' is a parameter in the [[fort.15 file]] controlling controlling the finite amplitude terms and wetting-drying in ADCIRC. The value of NOLIFA effects the meaning of the minimum water depth parameter ([[H0]]) and requires the specification of additional parameters together with [[H0]].  


== Parameter Summary ==
== Parameter Summary ==
The following table is a summary of possible NOLIBF values, description, details, and other necessary input parameters and files.
The following table is a summary of possible NOLIFA values, description, details, and other necessary or recommended input parameters.


{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! NOLIBF Value
! NOLIFA Value
! Description
! Description
! Details
! Details
! Other Required Inputs
! Required/Recommended Inputs
|-
|-
| 0
| 0
| linear bottom friction law
| No finite amplitude terms and no wetting-drying
| uses a spatially constant linear bottom friction, <math>\tau_b</math> of dimensions [1/T]
| The depth is linearized by using the bathymetric depth, rather than the total depth, in all terms except the transient term in the continuity equation. Wetting and drying of elements is disabled. Initial water depths are assumed equal to the bathymetric water depth specified in the [[fort.14 file]].
| [[FFACTOR]]
| [[H0]], [[NOLICA]] = 0
|-
|-
| 1
| 1
| quadratic bottom friction law
| Finite amplitude terms without wetting-drying
| can specify a spatially constant or spatially varying dimensionless coefficient, <math>C_f</math>; in which <math>\tau_b = C_f|U|/H</math>
| Finite amplitude terms are included in the model run and wetting and drying of elements is disabled. Initial water depths are assumed equal to the bathymetric water depth specified in the [[fort.14 file]].
| [[FFACTOR]]
| [[H0]], [[NOLICA]] = 1
|-
|-
| 2
| 2
| hybrid nonlinear bottom friction law
| Finite amplitude terms with wetting-drying
| 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)
| Finite amplitude terms are included in the model run and wetting and drying of elements is enabled. Initial water depths are assumed equal to the bathymetric water depth specified in the [[fort.14 file]].
| [[FFACTORMIN]], [[HBREAK]], [[FTHETA]], [[FGAMMA]]
| [[H0]], [[NOLICA]] = 1
|}
|}


== Usage Notes ==  
== 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.
When the finite amplitude terms are turned on, the time derivative portion of the advective terms should also be turned on for proper mass conservation and consistency (i.e., when NOLIFA > 0, then [[NOLICA]] = 1).
 
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 16:31, 3 April 2020

NOLIFA is a parameter in the fort.15 file controlling controlling the finite amplitude terms and wetting-drying in ADCIRC. The value of NOLIFA effects the meaning of the minimum water depth parameter (H0) and requires the specification of additional parameters together with H0.

Parameter Summary

The following table is a summary of possible NOLIFA values, description, details, and other necessary or recommended input parameters.

NOLIFA Value Description Details Required/Recommended Inputs
0 No finite amplitude terms and no wetting-drying The depth is linearized by using the bathymetric depth, rather than the total depth, in all terms except the transient term in the continuity equation. Wetting and drying of elements is disabled. Initial water depths are assumed equal to the bathymetric water depth specified in the fort.14 file. H0, NOLICA = 0
1 Finite amplitude terms without wetting-drying Finite amplitude terms are included in the model run and wetting and drying of elements is disabled. Initial water depths are assumed equal to the bathymetric water depth specified in the fort.14 file. H0, NOLICA = 1
2 Finite amplitude terms with wetting-drying Finite amplitude terms are included in the model run and wetting and drying of elements is enabled. Initial water depths are assumed equal to the bathymetric water depth specified in the fort.14 file. H0, NOLICA = 1

Usage Notes

When the finite amplitude terms are turned on, the time derivative portion of the advective terms should also be turned on for proper mass conservation and consistency (i.e., when NOLIFA > 0, then NOLICA = 1).

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