22.214.171.124.2.1 Analytic element model
Recharge was not included in the regional (GW AEM). Recharge in no development, (baseline) and (CRDP) is the same. In this modelling approach, only the change in the system due to coal resource development is simulated. The change in due to coal development is zero and therefore recharge is not included. A more detailed discussion on this rationale and the effect on predictions is provided in the qualitative analysis in Section 126.96.36.199.
188.8.131.52.2.2 Alluvial MODFLOW models
to the alluvium is determined in two stages. Firstly, the target amount is determined from the observed salinity of the alluvium and stream and set as a fraction of monthly rainfall. After the Australian Water Resources Assessment Landscape model (AWRA-L) was fitted to the streamflow of the subcatchments, a monthly recharge distribution is extracted and scaled to the target values already used in fitting the MODFLOW model. The initial estimate was 20% of monthly rainfall applied to each stress period as recharge to alluvium. During the analysis, this percentage is allowed to vary between 2% and 40% (see Section 184.108.40.206).
The fitting period was a 30-year interval from 1982 to 2011. The same 30-year interval was used for future climate runs, but recharge values were modified by seasonal scaling factors derived from global climate models (GCMs) as outlined in companion submethodology M06 (as listed in Table 1) for surface water modelling ().
Product Finalisation date
- 220.127.116.11 Methods
- 18.104.22.168 Review of existing models
- 22.214.171.124 Model development
- 126.96.36.199 Boundary and initial conditions
- 188.8.131.52 Implementation of coal resource development pathway
- 184.108.40.206 Parameterisation
- 220.127.116.11 Observations and predictions
- 18.104.22.168 Uncertainty analysis
- 22.214.171.124 Limitations and conclusions
- Currency of scientific results
- Contributors to the Technical Programme
- About this technical product