ATM evaluated potential causes of and solutions to erosion and wave overtopping impacts to the property. After completing a site assessment and a preliminary coastal engineering evaluation, ATM proposed alternatives for cliff and beach stabilization along a portion of Barnes Bay. Detached breakwaters were also recommended for reduction of wave overtopping impacts occurring at two locations along a rocky headland feature on the property.
In 2010, ATM deployed a wave and current meter and developed far- and near-field numerical modeling utilizing hindcast and site data to further evaluate the coastal processes driving the problems and to develop concept designs for the project. ATM prepared a comprehensive summary document and presented it to the government with recommended solutions and monitoring requirements.
In 2011, more detailed beach and bathymetric surveys, beach nourishment and nearshore breakwater design, offshore borrow area geotechnical and marine resources survey, offshore breakwater design, and revetment design were developed.
As part of the design, ATM implemented several numerical models, including wave transformation (SWAN, BOUSS-2D), wave interaction with structures and cliff shorelines (COBRAS) and shoreline change/sediment transport (GENESIS). Design development resulted in two 140-foot long low-crested breakwaters, consisting of 6 to 11-ton armor stone to reduce wave impacts at the headland, and four low-crested breakwaters and 15,000 cubic yards of beach fill to nourish and stabilize the eastern end of Barnes Bay. ATM supported technical plan development and government regulatory review of the project and provided construction oversight support.
- Coastal Engineering Site Assessment
- Field Data Collection – Beach Profile & Offshore Surveys, etc.
- Numerical Modeling
- Design & Alternatives Analysis
- Design & Construction Docs
- Environmental Services
- Government Coordination & Public Participation Support
- Bidding & Construction Support