Fort.19: Non-periodic Elevation Boundary Condition File

The fort.19 file contains non-periodic, time varying elevation boundary conditions for “elevation specified” boundary nodes. This file is only read when an “elevation specified” boundary condition has been specified in the Grid and Boundary Information File (NOPE>0) and NBFR=0 in the Model Parameter and Periodic Boundary Condition File.

File Structure

The basic file structure is shown below. Each line of input data is represented by a line containing the input variable name(s). Loops indicate multiple lines of input.

ETIMINC
for k=1 to NETA
   ESBIN(k)
end k loop

Repeat the block above for each time step until the end of the simulation.

Notes

  • The first set of elevation values are provided at TIME=STATIM (as specified in fort.15). Additional sets of elevation values are provided every ETIMINC.

  • Enough sets of elevation values must be provided to extend for the entire model run, otherwise the run will crash!

  • The node order in this file must match the order specified in the elevation specified boundary condition part of the Grid and Boundary Information File.

Example

The following is a simple example of a fort.19 file with three elevation nodes:

900.0
0.5
0.5
0.5
0.6
0.6
0.6
0.7
0.7
0.7

This example shows:

  • A time increment (ETIMINC) of 900.0 seconds (15 minutes)

  • Three elevation specified boundary nodes (NETA=3)

  • Three time steps of data, with values starting at 0.5 meters and increasing by 0.1 meters for each time step