Authors / CoAuthors
Gravois, U. | Baldock, T. | Callaghan, D. | Davies, G. | Nichol, S.
Abstract
Winds, waves and tides associated with storms are capable of causing severe damage to coastal property and infrastructure. Locations that are prone to erosion and inundation first require an accurate assessment of risk before deciding the most cost effective mitigation option. This research aims to produce probabilistic assessments of the coastal erosion and inundation risks associated with storms, particularly for coincident or clustered events, thereby helping to strengthen the resilience of coastal communities. Coastal erosion and inundation hazard is modelled in this study by simulations of realistic storm condition forcing (waves and tides) through a morphodynamic model to calculate return periods for maximum extent of shoreline retreat and storm demand. This approach of estimating erosion return periods is superior to the assumption that the most energetic storm causes maximum erosion. The methodology is demonstrated at Old Bar, NSW and the metropolitan Adelaide beaches, SA, which are both currently erosion hotspots in Australia. These sites were selected to test the methodology for a span of geographic conditions in terms of storm climate and deep-water wave exposure, working towards developing this method into a transportable framework applicable to other coastal areas. Desktop and field assessments of each site were conducted to document geomorphic and sediment characteristics to inform shoreline modelling. Having established the historical framework at each location, multivariate statistical analysis of wave (buoy or hindcast models) and tides for peak storm events has allowed for the synthesis of realistic future conditions. This complex sequencing of cycling between accretion and erosion incorporating cross-shore and alongshore sediment transport has been estimated using a probabilistic shoreline evolution model. Here, model outputs for both sites are illustrated and used to access risk to infrastructure based on the most probable envelope of the shoreline. Presented at the 2018 American Shore and Beach Preservation Association (ASBPA) National Coastal Conference. Galveston, TX
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document
eCat Id
121186
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
Australia
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- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Theme )
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- coastal erosion
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- coastal risk
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- wave modelling
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- Published_External
Publication Date
2024-09-12T02:24:01
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completed
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Abstract to the ASBPA 2018 National Coastal Conference: Resilient Shorelines for Rising Tides
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geoscientificInformation
Series Information
The American Shore and Beach Preservation Association’s (ASBPA) annual National Coastal Conference: Resilient Shorelines for Rising Tides, 30 October - 2 November 2018, Galveston, Texas.
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Developed as part of the Bushfire and Natural Hazards CRC Project "Resilience to clustered disaster events at the coast". Led by UQ collaborators
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[-39.9802, -28.8189, 134.7768, 156.9066]
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Spatial Resolution
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