A Coastal Erosion Risk Assessment Framework

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Alvarez, F
De Lucia, L
da Silva, GV
Javernig, B
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2023
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Sunshine Coast, Australia

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Abstract

With the increased pressure on the coastlines including population growth, development of new infrastructure, wave pattern changes and sea level rise due to climate change, coastal erosion is likely to continue to be one of the primary concerns for coastal communities and coastal managers during the next years and decades. The Gold Coast City Council (City) manages over 50 km of coastline while receiving over 5 million visitors per year and is one of the fastest growing cities in Australia. While often the magnitude of coastal erosion is difficult to predict and manage, the City is developing a framework to monitor beach erosion and assess erosion risk based on a comprehensive coastal monitoring program including hydrographic surveying, shoreline monitoring using video cameras, asset mapping, numerical modelling, consultancy studies and scientific research. To do so, the methodology was divided into six steps: 1) the latest survey is used to define the current beach condition; 2) a series of pre-computed XBeach simulations are used to define expected storm demands for different wave Average Return Intervals (ARI); 3) ARGUS-derived beach widths are used to incorporate the long-term trends; 4) sand volumes stored on the bar are also accounted for, based on the surveys; 5) locations of specific built assets are incorporated; 6) climate change shoreline retreat is included. A score is provided for each section based on their ability to withstand a 5-year ARI storm and a 50-year ARI storm. The outputs of this framework will be used to inform maintenance operations as well as management and strategic decisions.

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Australasian Coasts and Ports 2023 Conference

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Marine engineering

Climate change impacts and adaptation

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Alvarez, F; De Lucia, L; da Silva, GV; Javernig, B, A Coastal Erosion Risk Assessment Framework, Australasian Coasts and Ports 2023 Conference, 2023, pp. 496-502