5.1.2. Create Model¶

Here, the code blk3cellOct.exe is used to create both a conductivity and an intrinsic chargeability model on the OcTree mesh. For this example, we use the mesh that was created in the example “create OcTree mesh”. Files relevant to this part of the example are in the sub-folder octree_model. Before running this example, you may want to do the following:

Download and open the zip folder containing the entire DCIP octree example (if not done already)

Learn how to run blk3cellOct

Learn the format of the input files blk3cellOct.inp

Important

If you have topography, do not worry about defining the air cells. When forward modeling or inverting DC/IP data, the code will use the active cells model to determine which cells are in the air and assign an appropriate value.

Conductivity model: Here is the input file used to construct the conductivity model (blk3cellOct_con.inp)

../../_images/blk3cellOct_con_input1.png

The resulting Octree model shows a more conductive block (\(\sigma\) = 0.1 S/m) to the West and a more resistive block (\(\sigma\) = 0.001 S/m) to the East within a moderatively conductive background (\(\sigma_b\) = 0.01 S/m).

Chargeability model: Here is the input file used to construct the chargeability model (blk3cellOct_chg.inp)

../../_images/blk3cellOct_chg_input1.png

The resulting Octree model shows the more conductive block to the West is chargeable (\(\eta\) = 0.1 V/V), but the more more resistive block to the East is not. The background is also non-chargeable.