- Title
- A monthly network flow program emulator of the PRAMS Gnangara groundwater model
- Creator
- Cui, Lijie; Kuczera, George; Xu, Chengchao; Milligan, Neil; Canci, Mike; Jeeveraj, Charles; Donnelly, Michelle
- Relation
- Hydrology and Water Resources Symposium 2014. Proceedings of the Hydrology and Water Resources Symposium 2014 (Perth, W.A. 24-27 February, 2014) p. 565-572
- Relation
- http://www.engineersaustralia.org.au/
- Publisher
- Engineers Australia
- Resource Type
- conference paper
- Date
- 2014
- Description
- Perth is facing significant water resource pressures as a result of a growing population and a drying climate. To evaluate sustainable future options, the Integrated Water Supply Scheme (IWSS) model is being upgraded to include a significantly more detailed representation of the Gnangara groundwater system, one of the major sources of water for the Perth system. A MODFLOW model called PRAMS has been developed for the three-aquifer Gnangara system. However, it is computationally expensive making its direct inclusion in the IWSS model impractical. This study describes the development of a computationally efficient emulator of the Gnangara system. The IWSS model upgrade has been developed using the WATHNET5 water resource simulation/optimization framework. At the heart of WATHNET5 is a network flow program which was used to emulate the behaviour of the Gnangara system using monthly time steps. The emulation involved discretising the Gnangara system as follows: the superficial aquifer was subdivided into 26 zones, while the confined Leederville and Yarragadee aquifers were each subdivided into 2 zones. Each zone in the emulator was represented by a reservoir with arcs interconnecting the reservoirs. Each arc was assigned a very large negative cost and a capacity based on a Darcian algorithm with unknown conductivity and storage parameters. The PRAMS model was run for a 40-year period with a period of zero abstraction followed by heavy abstraction leading to significant drawdown. The monthly flow volume exchanges between the 30 zones were extracted from the PRAMS simulation and were used to calibrate the network flow program emulator. The calibrated emulator is shown to satisfactorily emulate major fluxes. Importantly it can simulate the 40-year period in about 1 second instead of tens of hours using PRAMS.
- Subject
- water resources development; water supply management; population density; water supply engineering; aquifers; groundwater flow; simulation methods
- Identifier
- http://hdl.handle.net/1959.13/1064764
- Identifier
- uon:17643
- Identifier
- ISBN:9781922107190
- Language
- eng
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