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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.
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|
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.