2D regional model

Using a 2D model, greater detail can be represented for computationally practicable models than for a 3D model.

The domain modelled is about 21 km by 3.5 km and lies approximately along a line of flow in the more permeable near-surface sandstones. This line was chosen because groundwater flow in these rocks is expected to be a major control on flow in the deeper less permeable rocks.

The left half of the model is offshore.

As for the 3D model, the use of the finite-element method in NAMMU enables a good representation of the complex domain with many hydrogeological units and faults.

NAMMU includes options designed to make it easy to generate grids with faults.

The hydrogeological units are indicated by different colours in the Figure. The darker shades indicate faults. The finite-element grid, which contained about 46,500 triangular elements is also shown.

Many of the units have anisotropic permeability not aligned with the coordinates.

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