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iMOD User Manual version 5.2 (html)


9.8IFF-files

The File syntax for IFF-files (iMOD Flowpath File) is very simple and stored in ASCII-format. In this way these type of files can be easily edited and/or created outside iMOD with other (commercial) software. The formal syntax is as follows and prescribed:

NFIELDS

Number of fields; NFIELDS=9.

PARTICLE_NUMBER

Number of the particle in the particle tracking.

ILAY

Modellayer number of the current position of the particle.

XCRD.

X-coordinate of the current position of the particle.

YCRD.

Y-coordinate of the current position of the particle.

ZCRD.

Z-coordinate of the current position of the particle.

TIME(YEARS)

Age at the current position of the particle.

VELOCITY(M/D)

Velocity at the current position of the particle.

IROW

Row number at the current position of the particle.

ICOL

Column number at the current position of the particle.

DATABLOCK

Each record (line) will contain data for each field.

iMOD will draw the flow path using the XCRD, YCRD and ZCRD (the latter is used within the Cross-Section Tool and the 3-D Tool). Whenever the PARTICLE_NUMBER changes, iMOD will start drawing another line until the end of the IFF-file is reached.

Example of an IFF-file:

9
PARTICLE_NUMBER
ILAY
XCRD.
YCRD.
ZCRD.
TIME(YEARS)
VELOCITY(M/DAY)
IROW
ICOL
1 16 251360.000 470918.000 -6.11097100 0.00000000 0.00000000 172 135
1 16 251300.000 470944.332 -6.16740767 1014.79259 0.176826867E-03 172 134
1 16 251200.000 470992.694 -6.90532732 2710.67655 0.178854918E-03 172 133
1 16 251185.895 471000.000 -7.57157748 2950.02773 0.181689347E-03 171 133
1 16 251100.000 471044.002 -8.85614470 4369.76038 0.185446949E-03 171 132
1 16 251000.000 471099.323 -9.61260329 6013.67094 0.189062199E-03 171 131
1 16 250998.847 471100.000 -10.2993888 6032.53827 0.193970342E-03 170 131
1 16 250900.000 471156.775 -11.5664571 7594.27486 0.198120264E-03 170 130
1 16 250829.109 471200.000 -12.3420800 8700.03539 0.204218837E-03 169 130
1 16 250800.000 471217.342 -13.5170305 9138.31615 0.211151282E-03 169 129
2 16 251360.000 470918.000 -6.13093100 0.00000000 0.00000000 172 135
2 16 251300.000 470944.332 -6.18703115 1014.79259 0.176826866E-03 172 134
2 16 251200.000 470992.694 -6.92436614 2710.67655 0.178854917E-03 172 133
2 16 251185.895 471000.000 -7.59057218 2950.02773 0.181689347E-03 171 133
2 16 251100.000 471044.002 -8.87458960 4369.76038 0.185446948E-03 171 132
2 16 251000.000 471099.323 -9.63038197 6013.67094 0.189062198E-03 171 131
2 16 250998.847 471100.000 -10.3171595 6032.53827 0.193970342E-03 170 131
2 16 250900.000 471156.775 -11.5835148 7594.27486 0.198120263E-03 170 130
2 16 250829.109 471200.000 -12.3586440 8700.03539 0.204218836E-03 169 130
2 16 250800.000 471217.342 -13.5334170 9138.31615 0.211151282E-03 169 129
2 16 250766.894 471237.981 -14.3071899 9634.91730 0.214644513E-03 169 129