Design review for the gold coast seawall for climate change
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As climate change will increase the vulnerability of the Gold Coast beachfront assets due to increased sea levels and storminess, a review of the present standard seawall designs and alignment was implemented by the City. The standard seawall design and alignment were adopted by the City in the early 1970's. The value of assets at risk is now far greater than in the 1970's and recent erosion has reinforced the need for a continuous wall of suitable standard. The seawall was designed as a terminal wall that would be buried under dunes except in severe events similar to 1967. The only design change in over 40 years was an option in the 1980's replacing the clay / shale tertiary layer with geotextile was adopted in the early 1980's. The review has applied present rock seawall design guidelines and standards for the predicted conditions resulting from climate change. Future wave heights, scour levels and overtopping at the wall were determined by modelling. Methods to evaluate the present condition and damage modes of the existing seawalls after long term service were investigated. Methods included bore holes, GPR and peel back of the armour layers. New technologies and strategies for staged implementation and suitable trigger timeframes were also investigated. The review found that the standard seawall designs conformed to present standards but upgrading in the future would be required. Future exposure levels and design conditions were developed along the coastline. Upgrading and completion of a continuous seawall will be required for the future security of Gold Coast beachfront assets. With the uncertainty re the rate and extent of changes to sea levels and design wave heights, a staged approach is practical.
Practical Responses to Climate Change Conference 2014
Self-archiving of the author-manuscript version is not yet supported by this conference Please refer to the conference link for access to the definitive, published version or contact the authors for more information.
Environmental Impact Assessment