For each parameter set in the uncertainty analysis, four simulations are undertaken as follows:

  • A steady-state initialisation. This initialises the model for the three other simulations. No mining is performed (i.e. no groundwater extraction and no conductivity enhancement), nor is there any extraction of groundwater for non-mining uses. Rainfall recharge and evapotranspiration vary spatially, but are set at their average values for the period 1980 to 2012, so they are not temporally varying. The reference heads for the general-head boundary conditions are set at their hydrostatic values. This simulation is run for 106 years to reach approximate steady-state under these average conditions. Because of the adaptive time-stepping capability of MOOSE (2016) this simulation is computationally cheap, despite simulating 106 years of steady conditions.
  • A no-development simulation. The heads at each finite-element node are initialised with their values from the steady-state simulation. No mining is performed. Groundwater is extracted via licensed bores. Rainfall recharge and evapotranspiration are spatially and temporally varying. The reference heads for the general-head boundaries are the heads from the steady-state simulation (not the reference heads from that simulation). This simulation runs from 1980 to 2102 on a monthly stress period.
  • A baseline simulation. This is identical to the no-development simulation, except that baseline mines are made active (including the groundwater extraction and conductivity enhancement for those mines).
  • A CRDP simulation. This is identical to the baseline simulation except that all additional coal resource developments are also made active.
Last updated:
18 January 2019
Thumbnail of the Hunter subregion

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