Detailed calibrated flow, wave and advection-dispersion models form the platform that allows a range of release scenarios to be investigated. A combination of regional and local scale two and three dimensional models build upon the base model from the Broadwater Assimilative Capacity Study to allow the simulation of the following important processes:
- The lag between water levels and changes in flow direction
- Impacts of wind and waves on flow regime and mixing ability
- The resulting return of nutrients into the Broadwater during the flood tide
- Long term accumulation (if any) of nutrients with the Broadwater
The industry standard, MIKE by DHI modelling platform was adopted for this study. MIKE 21 and MIKE 3 provide the tools to simulate free surface flow, waves and advection dispersion.
This modelling program provides the information required to increase our knowledge of the behaviour and the extent of the excess recycled water released at the Gold Coast Seaway under various conditions.
The resulting calibrated models were then used as a key component of the Seaway SmartRelease Decision Support System, providing operators at the Coombabah WWTP with real-time information thereby optimising the release of the excess recycled water.
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