2.6.2.4.2 Lateral


Analytic element modelling is grid independent and by default assumes aquifers and aquitards are of infinite extent. The eastern boundary of the upper Permian coal measures is implemented as a no-flow boundary in the model (Figure 10).

The direct contact between the upper Permian coal measures and the Cenozoic/alluvium aquifer is implemented as a linear feature in the groundwater analytic element model (GW AEM) in the centre of the area where upper Permian coal measures subcrop underneath the Cenozoic and Quaternary cover sediments. The linear feature allows groundwater levels in the upper Permian coal measures to locally equilibrate with groundwater levels in the Cenozoic/alluvium aquifer through a conductance term which represents the Cenozoic aquitard. In effect, this means groundwater extraction in the upper Permian coal measures can propagate directly to the Cenozoic/alluvium aquifer layer.

Figure 10

Figure 10 Lateral and internal boundary conditions and model nodes for the groundwater analytic element model (GW AEM) for the Galilee subregion

AWRA = Australian Water Resources Assessment; GAL = Galilee subregion

Data: Bioregional Assessment Programme (Dataset 1)

Last updated:
6 December 2018
Thumbnail of the Galilee subregion

Product Finalisation date

2018
PRODUCT CONTENTS

ASSESSMENT