Client: Parks Victoria
Commercial and recreational boating in the lower Yarra River is constrained by siltation of navigational channels. Dredging operations to remove the siltation material are also challenged by restricted access and few dredge material management options.
Assessment of a proposed dredging and material management strategy included 3-dimensional (3D) hydrodynamic and sediment transport modelling of the lower Yarra River, a stratified ‘salt-wedge’ estuarine system. The modelling represented the density gradients through the water column and the influence this has on the advection-dispersion of dredge plumes and resuspension of the bed sediments. The assessments demonstrated that lower Yarra River water quality objectives could be met during the proposal operations.
Outcomes and Benefits
This project assisted Parks Victoria with a potential strategy to address siltation issues in the lower Yarra River. The outcomes may be used to support an approvals application to undertake the proposed works.
Services and Expertise Provided:
The Brisbane River Catchment Flood Study is the most detailed and comprehensive flood study ever undertaken in Australia. The hydraulic models that were developed underwent rigorous calibration. A sophisticated Monte Carlo approach was used to hydraulically model 11,340 flooding scenarios. The result was a robust and defendable set of design events. The study was fully peer reviewed by a panel of independent experts.
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BMT has developed a comprehensive model for analysing the impacts on morphological processes of the Murray River mouth and associated water levels and salinity levels throughout Coorong and Lower Lakes resulting from variable river flows and release strategies at the barrages, incorporating ocean tide, storm surge, wave and wind processes.