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Fort.15 file

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Revision as of 23:40, 12 February 2021 by Taylorgasher (talk | contribs) (updated met-only mode, per recommendations from Kyle Steffen)
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This file contains the majority of the parameters required to run both the 2DDI and 3D versions of ADCIRC and the information to drive the model with harmonic boundary conditions (either elevation or flux). This file is required to run the ADCIRC model.

File Format

See fort.15 file format for details.

Tips and Tricks

Meteorological-Only Mode

By turning off all ocean state-related outputting and disabling wave coupling, ADCIRC will run in "met.-only" mode, a quick and convenient way to read in and write out meteorological data files. In this mode, only routines necessary for meteorological forcing are called, i.e. no water levels nor velocities are computed. Note that by changing DT, you can speed up this "simulation". More specifically, since the only things being output are meteorological data, you can set DT equal to the time interval you wish met. data to be output, and then set the NSPOOLM and/or NSPOOLGW (the local and global met. output intervals) to 1 (i.e. output every time step). For typical 2D ADCIRC runs, this requires setting the following in the fort.15 file:
NOUTE = 0
NOUTV = 0
NOUTGE = 0
NOUTGV = 0
NHSTAR = 0
NHASE = 0
NHASV = 0
NHAgE = 0
NHAGV = 0

For passive scalar transport (IM = 10), also set:
NOUTC = 0
NOUTGC = 0

while for barotropic or baroclinic 3D ADCIRC, also set: I3DSD = 0
I3DSV = 0
I3DST = 0
I3DGD = 0
I3DGV = 0
I3DGT = 0

Ramping Meteorological Forcing at Hot-Start

Let's say you run a 15-day tide-only run and output a hotstart file. Then, you want to hotstart a simulation with meteorological forcing. Initiating the hotstart simulation with full-strength met. forcing could apply a shock to the system, creating spurious waves. Therefore, it's best to ramp in the met. forcing. But, ramping parameters like DRAMP define the start of ramp time as being cold-start time. Setting
NRAMP = 8
means you can supply DRAMPUnMete, which is the number of delays at which to start met. ramping, on the DRAMP line. Here's an example:
5 0 0 0 0 0 0.5 0 15  ! DRAMP,DRAMPExtFlux,FluxSettlingTime,DRAMPIntFlux,DRAMPElev,DRAMPTip,DRAMPMete,DRAMPWRad,DRAMPUnMete
What this says is that a 0.5-day ramp will be applied to the met. forcing, starting at run day 15.0 (the hotstart simulation's start time).