NDLI: Linking near- and far-field hydrodynamic models for simulation of desalination plant brine discharges.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Botelho, D. A. Barry, M. E. Collecutt, G. C. Brook, J. Wiltshire, D.
Spatial Coverage	South Australia
Description	Country affiliation: Australia Author Affiliation: Botelho DA ( BMT WBM Pty Ltd, Level 8, 200 Creek St, Brisbane, QLD, 4000, Australia. Daniel.botelho@bmtwbm.com.au)
Abstract	A desalination plant is proposed to be the major water supply to the Olympic Dam Expansion Mining project. Located in the Upper Spencer Gulf, South Australia, the site was chosen due to the existence of strong currents and their likely advantages in terms of mixing and dilution of discharged return water. A high-resolution hydrodynamic model (Estuary, Lake and Coastal Ocean Model, ELCOM) was constructed and, through a rigorous review process, was shown to reproduce the intricate details of the Spencer Gulf dynamics, including those characterising the discharge site. Notwithstanding this, it was found that deploying typically adopted 'direct insertion' techniques to simulate the brine discharge within the hydrodynamic model was problematic. Specifically, it was found that in this study the direct insertion technique delivered highly conservative brine dilution predictions in and around the proposed site, and that these were grid and time-step dependent. To improve the predictive capability, a strategy to link validated computational fluid dynamics (CFD) predictions to hydrodynamic simulations was devised. In this strategy, environmental conditions from ELCOM were used to produce boundary conditions for execution of a suite of CFD simulations. In turn, the CFD simulations provided the brine dilutions and flow rates to be applied in ELCOM. In order to conserve mass in a system-wide sense, artificial salt sinks were introduced to the ELCOM model such that salt quantities were conserved. As a result of this process, ELCOM predictions were naturally very similar to CFD predictions near the diffuser, whilst at the same time they produced an area of influence (further afield) comparable to direct insertion methods. It was concluded that the linkage of the models, in comparison to direct insertion methods, constituted a more realistic and defensible alternative to predict the far-field dispersion of outfall discharges, particularly with regards to the estimation of brine dilution in the immediate vicinity of an outfall location.
File Format	HTM / HTML
ISSN	02731223
Issue Number	6
Journal	Water Science & Technology
Volume Number	67
e-ISSN	19969732
Language	English
Publisher	IWA Publishing
Publisher Date	2013-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Hydrology Hydrodynamics Industrial Waste Models, Theoretical Salinity Water Movements South Australia Journal Article
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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