DETAILED mapping as part of the Cape to Cape Coastal Resilience Project has been released to provide a base for authorities when determining the impact of coastal hazards.
Inverloch Region Coastal Hazard Assessment modelling has looked at both present-day conditions and predicted future changes, providing key data for developing a long-term plan based on science, technical assessments and community aspirations.
Informed by extensive analyses of the region’s geological formation, local conditions, and historic and recent changes along the Cape to Cape coastline, the project team developed various computer models to simulate conditions of the local coastal, estuarine and catchment areas.
These models assessed:
• Sediment transport.
• Shoreline response (erosion / accretion).
Looking at both present-day conditions and predicted future changes, such as rising sea levels and changing wind and wave climates, the models have been used to examine how the coastline might change and respond.
Six different sea level rise scenarios have been considered from 0.0m (present day), 0.2m (2040), 0.5m (2070), 0.8m (2100) and 1.1m and 1.4m (2100, based on recent global estimates).
The AEP detailed on the maps is the Annual Exceedance Probability which means on average, the probability of a storm event occurring in any given year.
A higher AEP means it is more likely the event will occur in any one year. The 10%, 5% and 1% AEPs have been modelled for the following time periods: present day, 2040, 2070 and 2100.
Hazard bands shown in the modelling provide an indication of areas potentially at risk from coastal hazard events, but do not represent a predicted loss of coastal land or loss or damage to values and assets.
“These hazard bands provide an indication of areas that may potentially be impacted by different coastal hazard types if no efforts were made to change how we manage these areas,” DELWP Gippsland acting regional director, Heather Adams, said.
“They help us to identify focus areas for actions, by allowing us to quantify exposure, vulnerability and risk and inform strategic decisions for the future management of these areas.
“They are also attempting to predict possible conditions well into the future, so this means we have time to help carefully and proactively plan our response.”
The maps are now available online for the community to view, and determine what interventions they want pursued.
This could involve beach renourishments, groyne structures, rock revetments or adaptation options relating to strategic planning.
Other scenarios that could be considered in the project include whether roads, such as Bunurong Road, may need to be raised or relocated, or if certain areas would be deemed unsuitable for development.
The Cape to Cape Resilience Project is overseen by the Inverloch Regional and Strategic Partnership (RaSP), a partnership of nine land management agencies working collaboratively to adapt to climate change and address risks associated with the dynamic coastline at Inverloch.
Two wet sand fences were installed in 2019 at Bunurong Road and in front of the Inverloch Surf Life Saving Club as interim management measures.
A geotextile sandbag revetment was also completed in May 2020 to provide additional medium-term management of the area adjacent to the Surf Lifesaving Club.
The Coastal Hazard Adaptation Actions survey will close on Sunday, April 24.
The results of the full Coastal Hazard Assessment will be shared in July 2022.