Environmental Impact Assessment

Located in Central Queensland, south of Rockhampton, the proposed coal export terminal required marine operations to comply with the strict guidelines and authority of Maritime Safety Queensland (MSQ), the Australian Maritime Safety Authority (AMSA) and the Great Barrier Reef Marine Park Authority (GBRMPA).

Water Technology was engaged by CQG Consulting and FTP Pty Ltd to conduct a coastal environments EIS for the proposed coal export terminal within Raglan Creek. A range of data collection and environmental risk assessments as part of an EIS submission were undertaken, of which, a significant portion included the assessment of the hydrodynamic and sediment transport impacts associated with the dredging of a navigation channel and swing basin, which was also designed by Water Technology. The data collection included water levels, waves and currents both offshore and within the Fitzroy River.

The hydrodynamic impacts were assessed through the development of a calibrated hydrodynamic model of Raglan Creek and Keppel Bay of existing conditions, which was then modified to include the designed navigation channel and swing basin. The numerical model was used to assess tidal water levels, currents, extreme storm events, water quality, the impact of oil and coal spill events, port design, climate change assessment and dredging methodology reviews. The extent of the model allow cyclones to be simulated across the region and the impact on water levels and wave height to be established at the site. As an additional feature of the project, the impact of increased vessel travel within the Fitzroy River was simulated within the hydrodynamic model and the subsequent ship swash on the sensitive mangrove banks determined.

The dredge induced suspended sediment plume associated with the dredging of the channel and swing basin were also assessed though the calibration and application of a 3D suspended sediment transport model, which simulated the timing and movement of a cutter suction dredge. The long term change sediment transport and sedimentation within Raglan Creek and the navigation channel were also assessed, and suggestions made for future maintenance dredging.

Key Services Provided

• 2D & 3D Hydrodynamic Modelling
• 2D & 3D Sediment Transport Modelling
• Dredge Plume Modelling
• Dredge Channel and Swing Basin Design