COASTAL HAZARDS

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We work throughout the coastal zone, supporting disaster risk reduction studies for communities living on the coast.  

OUR SERVICES

 

We deliver national-scale to coastline-specific coastal processes assessments, hazard studies, coastal zone management plans, engineering assessments, dredge studies, beach nourishment designs, erosion assessments, coastal inundation/storm tide modelling and mapping, and coastal recession assessments.

Our work includes:

  • Extremes analysis (Long term wave/sea level assessment, TCRM toolbox)

  • Wave modelling (SWAN, SWASH, XBEACH, MIKE21 SW, MIKE21 BW)

  • Hydrodynamics and cyclones (Delft3D, MIKE 21, TUFLOW, Flow3D, XBeach)

  • Sediment transport and morphology (Delft3D, MIKE21)

  • Wave overtopping (EurOtop NN, XBeach)

  • Coastal Erosion (JEPA, JBEM, XBeach, Imagery analysis and CoastSat)

OUR PROJECTS

Douglas Storm Tide Inundation Study

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A detailed coastal flood inundation mapping study for the entire Douglas Shire coastline. This project improved existing “bathtub” flood mapping by developing an integrated hydrodynamic modelling-based map. This included the classification of coastal types (e.g. beach, mangrove, seawall) and use of a suite of modelling techniques to estimate wave overtopping at structures, wave propagation through vegetation, wave overwash on dunes, and attenuation from mangrove forests.   This used models including SWAN, XBeach, Tuflow and the Neural Network.  

Torres Strait Islands Coastal Erosion Study

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A coastal erosion study involving detailed modelling of the nearshore reef systems protecting the Torres Strait Islands.  The project used detailed XBeach modelling to simulate different reef and dune schematisations.  Coral reefs were schematised in XBeach using a varying bed roughness, with parametres to represent friction flow and wave dissipation coefficients.  Each island type was modelled for 1 in 25, 100 and 500-year return period storm event, which showed islands with small fringing reefs may have twice the impact of large storms than those with extensive systems.  

Kempsey Coastal Management Plan (CMP Phase 2

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A large-scale coastal hazard modelling assessment, released under the New South Wales Coastal Management Programme.  Our team performed detailed assessed long-term recession and erosion rates, analysed coastal watercourse entrance instability, and performed new coastal modelling using Tuflow and Xbeach of tidal propagation, coastal inundation, and erosion/inundation of foreshores.  

Cape York (Northern Peninsula) Coastal Hazard Assessment

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This project required technical analysis, numerical modelling, concept design and efficacy estimates to support the development of a long-term Coastal Hazard Adaptation Strategy.  It spanned three coastal towns within the Northern Peninsula; Seisia, Umagico and Injinoo, and included coastal processess assessments over three planning horizons; present day, 2050 and 2100.  Our team used large-scale cyclone modelling using Delft3D to simulate the likely erosion for events with a 5%, 1% and 0.2% Annual Exceedance Probability

Gladstone Regional Storm Tide and Erosion Study

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A detailed coastal processes study spanning the Gladstone region in Australia.  It included a coastal analysis, numerical hydrodynamic and cyclonic modelling using Delft3D, calculation of non-cyclonic water levels using the Skew Surge Joint Probability Method, climatology assessment using IBTrACS, development of a synthetic cyclone database using Geoscience Australia Tropical Cyclone Risk Model, statistical analysis on cyclonic and non-cyclonic joint probability, and estimation of local wave effects using numerical modelling.

Bargara (Bundaberg) coastal processes modelling

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A detailed coastal processes study to support the Bargara Shoreline Erosion Management Plan (SEMP).  Tasks included long term wave analysis, cross-shore modelling, longshore sediment transport modelling.  The latter considered the influence of groynes on sediment transport, and long-term erosion patterns.

Coastal hazard assessment, Yarrabah Aboriginal Shire Council 

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New storm surge and erosion modelling for the Yarrabah region to support coastal management, concept designs and hazard studies.  Coastal modelling used the TUFLOW and XBeach models to determine surge and wave conditions within Mission Bay, and the JEPA erosion tool to determine severity of erosion along the coast

Coastal processes and engineering options assessment, Burke and Carpentaria Councils

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Coastal engineering and hazard assessment for Burketown, Karumba and the Norman River in Far North QLD.  Tasks included site investigations, current-driven sediment transport modelling, Longshore Sediment Transport modelling, cross-shore modelling, designs of erosion mitigation options including beach nourishment, rock revetments, and a piled boat ramp to minimise sediment interruption

Sunshine Coast Erosion Study 

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The development of a new tool to analyse historic beach profile data collected during the ex-state government department Coastal Observation Program - Engineering (COPE).  The tool analyses monthly coastal profiles against extreme wave and water level statistics to assign a return period to any observed erosion events.  The outputs are a statistical distribution of frequent (i.e. between 10-50 year ARI) return period erosion estimates.  These are used to cross-check erosion modelling results against evidence-based data.

Longshore sediment transport, coastal processes, and erosion modelling for Moreton Island

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Detailed coastal sediment modelling to support the development of a Shoreline Erosion Management Plan (SEMP).  Tasks included numerical modelling and field investigations, wave simulations using SWAN, beach evolution modelling to track long-term sediment movement

Midge Point coastal modelling and boat ramp design

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This project developed new Delft3D numerical models to estimate tidal patterns through the northern Mackay coastline and extreme wave conditions at Jimmy’s Rock Road to support the detailed design of a new boat ramp.  The future current, water level and wave conditions were used to design new rock armour protection for the ramp under a 2070 planning horizon.  

Burdekin Dune Management Strategy

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The project included extreme coastal analysis, coastal erosion modelling and tidal mapping, evaluation of new nature-based dune management strategies, community education, signage, and ancillary structures (fencing, car parks, beach accessways etc). This information was compiled into a phased management plan, combining new on-ground works and engagement

Burdekin Region Storm Tide and Erosion Study

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A large-scale coastal modelling project spanning the Burdekin Region of northern Queensland.  It included a Delft3D tide, surge and cyclone model, which spanned 350km, with an varying grid resolution spanning offshore 2.4km to nearshore 200m.  This was coupled with a cyclone model based on the Holland scheme, with the Geoscience Australian TCRM used to generate 10,000 years of synthetic tracks for simulation.  Nearshore results were used within a XBeach coastal erosion model to understand the potential shoreline impacts at coastal villages.

Coastal Outfall Modelling, Sandy Street Moreton Bay

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A multi-phase project involving analysis of the interruption of littoral drift due to a new coastal outfall, physical modelling, numerical modelling and options appraisal.  Following physical testing, the study reproduced the natural sediment transport mechanisms at the Sandy Street outfall in a numerical model, which will be used to test design options for improving sand transport around the outfall head.  This used the XBeach morphodynamic model, which was calibrated against six accumulation events, which was nested within a large-scale Moreton Bay tide and wave model.  

Bowen Sediment Outfall Modelling

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A detailed sedimentation investigation at two open channel outlets at Bowen, Queensland.  Marine sediment has been accumulating at two open drains, which required ongoing mechanical excavation.  The assessment has considered a new approach to manage sand accumulation with a manually operated flush gate, which has been designed using a long-term sediment transport model and Beach Evolution Model, and Computational Fluid Dynamics (CFD) modelling of hydraulics and scour using Flow-3D.

Sovereign Islands Sediment Diffusion Study 

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Numerical modelling of sediment transport and diffusion to manage sediment deposition within navigation channels.  Tasks included capture of new coastal data (sediment grab samples, velocity/current measurements, sedimentation rates etc), and new detailed numerical modelling using Delft3D.  The study supported ongoing sediment management through dredging. 

Emu Point economic analysis of coastal adaptation options

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Working with EvoCoast, this project conducted a coastal erosion economic assessment and Cost-Benefit Appraisal (CBA) of several coastal adaptation options for the Emu Point to Middleton Beach Coastal Hazard Risk Management and Adaptation Plan (CHRMAP).  Prepared for the local Council, the cost-benefit methodology has been designed to provide a quantitative, economic assessment of a range of adaptation options to address erosion vulnerability.  It provides information on the whole life costs of each management strategy devised to mitigate erosion, the damages avoided due to the scheme implementation, and the economic benefits received within the Local Government Area.