Coastal Structures

BMT WBM undertakes investigations to determine design criteria and concept designs for a range of coastal structures including breakwaters, seawalls, river training walls and revetments.

This may involve assessment of the most effective fit for purpose structure layout while minimising or mitigating its impacts on the adjacent coastal environment.

Extreme wave and water level processes and design condition probabilities are investigated, together with response factors such as wave penetration into harbours, sand build-up and/or erosion at adjacent shorelines and navigational benefits.

Recent Relevant Projects

Artificial Reefs in Moreton Bay (Queensland)

The Queensland Government is planning to deploy purpose-built artificial reef structures within Moreton Bay Marine Bay, including the installation of prefabricated steel tower units in a high wave energy environment.  BMT WBM provided advice regarding the stability of the artificial reef structures under severe oceanic conditions.  The investigations undertaken by BMT WBM included establishment of extreme wave conditions, detailed analysis of water wave motion and wave and current induced forces and assessment of the structural stability and stresses in the components of the structure.

Shenzou Peninsula Harbour Entrance, Hainan Island (China)

Breakwater design for the marina entrance of a proposed resort development on Hainan Island in China was undertaken for VDM Consulting, involving assessment of extreme design waves and water levels, together with modelling of wave propagation and sediment transport processes.  Layout and preliminary armour size design of the outer breakwaters were undertaken, including detailed wave penetration analysis.  Channel siltation and dredging maintenance requirements, including sand bypassing, were investigated.

Cotton Tree Shoreline Protection (Queensland)

BMT WBM provided a recommended design geo-textile groyne field for protection works to defend the shoreline at Cotton Tree, Maroochydore.  The strategy was approved by the Queensland regulatory agency and adopted by Council.  The investigations for the works required initial assessments of the possibility of breakthrough, last line of defence options and numerical/physical modelling of hydrodynamic and water quality impacts of proposed protection works.  An understanding of local coastal and estuary sand transport mechanisms and erosion mitigation measures was developed during these studies.