iMOD User Manual version 4.4 (html)

11.7Tutorial 7: Interactive Pathline Simulator

This tutorial gives a brief overview of the capabilities of the Interactive Pathline Simulator Tool (IPS). It allows the user to demonstrate and examine the flow behaviour of the groundwater system in an interactive manner. For a full description of all IPS-functionalities, see Section 7.15.


This is what you will do:

Required Data

For this tutorial you need the following iMOD Data Files/folders:

Getting Started

iMOD is reading the content of the RUN file and starts the 3-D tool.

Note: {installfolder} refers to the full path of the directory you installed iMOD in (e.g. D:\iMOD). Note: If you are a left-handed person and you converted your mouse button settings, ’left mouse button’ should be ’right mouse button’ and vice versa in these tutorials.

Define the Starting Points

Position your Starting Points on the level of the calculated groundwater:

To add this selection of particles:

Starting the Particle Tracking

To start the particles simulation follow the next steps:

Pretty nice, isn’t it? You can turn the particle start location on and off by clicking the Glasses button

You can pause the simulation by pressing the Pause button and restart it by clicking the Continue button, so:

Enhance the Appearance

The pathlines are visualized by points or lines, the default is by points, these are the most efficient, howerver, lines sometimes can give a more realistic view, so:

We can configure the appearance and settings of the current particle set, so:

You are now in the Particles Settings window. We alter some settings such as ’Active’, ’Colour’, ’Forward or Backward’, ’Starting Point Size’, ’Pathline Size’ and ’Starting Interval’. In fact it is possible to have different groups of particles that go forward and backward.

The appearance of the particles is updated immediately.


Figure 11.107: Screen shot of a particle simulation in the ’Pathline’ tab of the 3D Tool.

Let us add another group of particles.

Starting Points around Sinks

Here you can specify how the particles need to be positioned in combination with sinks (a sink is a source that takes water out of the model, such as a river, drain or well). There is a single well in layer 3 that extract 500 m\(^{3}\)/d, so we would like to put particles around that well, so:

If the Plus button has been greyed out, that means that there is a simulation active that needs to be stopped first, so:

Change of Particle Tracking Directions

The particle from the well should migrate backwards, so let us change that:


Figure 11.110: Simultaneous pathlines simulation for two groups of particles, each having its own colour.

The blue particles can be turned off temporarily:

We can increase the density of the simulation by release more particles after each other, before they actually terminate, so:

You see that after a full length of a particle (in this case 10, namely the “tail length” ), another set of particles is released. You can try to see the effect of changing the “Repeat Freq.” 

Filtering of Particles

The final thing we do it to filter out particles during a simulation.

Now, only the particles that are captured by a strong sink will be repeated. In this way a sense of a capture zone if created. Okay. That it for today, so close the IPS by: