User's guide of Proceessing Modflow 5.0

Processing Modflow 195
Particles
To save the position and the attributes of each particle, choose Save Particles As from the File
menu and specify a file name in a Save Particle As dialog box. By selecting a file type in this
dialog box, you can save either the starting position or end position (after backward or forward
tracking) of each particle.
The following data format is used to save the particles:
1. Data: version label
2. Data: NP
3. Data: LI, LJ, LK, I, J, K, Z, C, R
The first line of this particle file contains the version label PMPATH_V100_PARTICLES. The
second line contains the number of particles NP. The third record contains one line of data for
each particle. The particle locations within the cell [J, I, K] are specified using local coordinates
[LJ, LI, LK]. Local coordinates vary within a cell from zero to one as shown in Fig. 4.14. In
addition, the global vertical coordinate Z, the color C and the retardation factor R of the particle
are saved in the same line.
The particles file can be loaded by choosing Load Particles from the File menu. When you
load a particle file, PMPATH just adds particles to the model. Already existing particles will not
be removed.
I
z
K
y
1
1
0
x
J
0
0 1
Fig. 4.14: Local coordinates within a cell
4.4 PMPATH Output Files