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.. _mf6-introduction:

MODFLOW6
========

These examples demonstrate how to use imod to build MODFLOW6 models.

.. attention:: 

    The examples expect you to have added the Modflow 6 executable to your PATH.
    If you have not done this yet:
    First, `download the latest Modflow 6 executables here. <https://water.usgs.gov/water-resources/software/MODFLOW-6/>`_
    Next, follow the following instructions to add the executable to your PATH on Windows 10:

    1. Press the Start key on your keyboard.
    2. Search and open “Edit the system environment variables.”
    3. Go to the “Advanced” tab.
    4. Click the “Environment variables” button.
    5. Select the “Path” variable under “User variables” or “System variables.”
    6. Click the “Edit” button.
    7. Press the “New” button.
    8. Type the full directory path of the program.
    9. Press “Enter” to confirm the path.
    10. Click “Ok.”
    11. Press the “Ok” button in the Environment Variables window.
    12. Click “Ok” in the System Variables window.

    `For more detailed instructions, see this writeup. <https://windowsloop.com/how-to-add-to-windows-path/>`_



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    <div class="sphx-glr-thumbcontainer" tooltip="This example illustrates how to setup a variable density groundwater flow and transport model using the imod package and associated packages.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_Henry_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_Henry.py`

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      <div class="sphx-glr-thumbnail-title">Henry</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="This example illustrates how to setup a very simple unstructured groundwater model using the imod package and associated packages.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_circle_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_circle.py`

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      <div class="sphx-glr-thumbnail-title">Circle</div>
    </div>


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    <div class="sphx-glr-thumbcontainer" tooltip="This example illustrates a circular model that is split into 3 submodels. The split method returns a simulation object that can be run as is. In this case the 3 submodels are roughly equal sized partitions that have the shape of pie pieces.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_circle_partitioned_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_circle_partitioned.py`

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      <div class="sphx-glr-thumbnail-title">Circle partitioned</div>
    </div>


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    <div class="sphx-glr-thumbcontainer" tooltip="This example illustrates how to setup a very simple unstructured groundwater transport model using the imod package and associated packages.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_circle_transport_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_circle_transport.py`

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      <div class="sphx-glr-thumbnail-title">Freshwater lens (circle)</div>
    </div>


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    <div class="sphx-glr-thumbcontainer" tooltip="This example focuses on regridding. It uses the TWRI model from modflow6 (`Harbaugh, 2005`). More information about this model can be found in an example dedicated to building this model ( ex01_twri.py)">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_different_ways_to_regrid_models_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_different_ways_to_regrid_models.py`

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      <div class="sphx-glr-thumbnail-title">Different ways to regrid models</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="This example has been converted from the `MODFLOW6 Example problems`_.  See the `description`_ and the `notebook`_ which uses `FloPy`_ to setup the model.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_ex01_twri_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_ex01_twri.py`

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      <div class="sphx-glr-thumbnail-title">TWRI</div>
    </div>


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    <div class="sphx-glr-thumbcontainer" tooltip="This example is taken from the MODFLOW6 Examples, number 35.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_example_1d_transport_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_example_1d_transport.py`

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      <div class="sphx-glr-thumbnail-title">1D Solute Transport Benchmarks</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="This source file contains functions that create a simulation that can be used in examples that are not focused on building a simulation, but on doing something with it (such as regridding).">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_example_models_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_example_models.py`

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      <div class="sphx-glr-thumbnail-title">Example models</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="This example shows a simplified script for building a groundwater model in the northeast of the Netherlands. A primary feature of this area is an ice-pushed ridge called the Hondsrug. This examples demonstrates modifying external data for use in a MODFLOW6 model.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_hondsrug_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_hondsrug.py`

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      <div class="sphx-glr-thumbnail-title">Regional model</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="This example shows how a model can be partitioned into submodels. This will allow parallelization when solving the model. The example used is the Hondsrug model. It is partitioned into 3 rectangular parts. In the example we first run the original, unpartitioned model. Then we partition the model and run the resulting simulation. Finally we merge the head output of the submodels into a head array for the whole grid. we print both the heads obtained without partitioning, and the merged heads of the partitioned simulation, &#x27; for comparison.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_hondsrug_partitioning_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_hondsrug_partitioning.py`

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      <div class="sphx-glr-thumbnail-title">Partitioning a regional model</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="This is a synthetic example (using invented, not necesarily physical data) of how to use the lake package api to generate models with lakes.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_lake_thumb.png
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  :ref:`sphx_glr_examples_mf6_lake.py`

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      <div class="sphx-glr-thumbnail-title">Lake package example</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="The simulation shown here comes from the  1999 MT3DMS report, p 138: Two-Dimensional Transport in a Uniform Flow of solute injected continuously from a point source in a steady-state uniform flow field.">

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  .. image:: /examples/mf6/images/thumb/sphx_glr_transport_2d_thumb.png
    :alt:

  :ref:`sphx_glr_examples_mf6_transport_2d.py`

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      <div class="sphx-glr-thumbnail-title">Transport 2d example</div>
    </div>


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    </div>


.. toctree::
   :hidden:

   /examples/mf6/Henry
   /examples/mf6/circle
   /examples/mf6/circle_partitioned
   /examples/mf6/circle_transport
   /examples/mf6/different_ways_to_regrid_models
   /examples/mf6/ex01_twri
   /examples/mf6/example_1d_transport
   /examples/mf6/example_models
   /examples/mf6/hondsrug
   /examples/mf6/hondsrug_partitioning
   /examples/mf6/lake
   /examples/mf6/transport_2d


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  .. container:: sphx-glr-footer sphx-glr-footer-gallery

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download all examples in Python source code: mf6_python.zip </examples/mf6/mf6_python.zip>`

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download all examples in Jupyter notebooks: mf6_jupyter.zip </examples/mf6/mf6_jupyter.zip>`


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    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_