Kangaroo Island Coastal Hazard Mapping Project

Coastal communities are vulnerable to sea level rise, coastal inundation, flooding and dune recession in our changing climate. In responding to these risks, local councils must actively collect data that informs practical decision making, and provide the opportunity for capacity and resilience building amongst staff, community, and other stakeholders in the mitigation and adaptation responses.

 

Community Workshop 1

Wednesday 8 August 2018
10am to 12.30 pm (light lunch provided)
Council Chambers, Dauncey Street Kingscote

Dr Mark Sebentritt from Seed Consulting will facilitate a Community Workshop to provide information about what the hazard maps have identified and a general overview of potential response options. 

A second Community Workshop in September will then discuss the preferred response options which will be incorporated into the project report providing recommendations to Council on adaptation actions. 

Please contact Anna Osman, Project Coordinator on 0427 994 226 or kicouncil@kicouncil.sa.gov.au to RSVP.

 

American River Boat Mooring
Community survey

To help inform the project, this community survey has been developed to help us understand what you value about our coastal areas, what erosion and coastal flooding impacts have been observed in the past, and the pros and cons of possible response options.

 

All survey responses will be kept confidential and will not be attributed to specific individuals.

 

Please click on this link to participate in the community survey https://www.surveymonkey.com/r/YGB5DGB 

Hazard Maps

An online erosion and inundation mapping tool has been developed.  The erosion and inundation mapping tool has been developed based on the following:-

  • Coastline categorised as sand, soft rock or hard rock.  Visit the Coast Adapt website for details http://coastadapt.com.au/coastadapt-interactive-map#-35.929463,137.175408,10
  • Prevailing wave direction and set up
  • Sea level rise of 30cm by 2050 and 100cm by 2100
  • Bruun Factor 50 and 100
    The theoretical amount of shoreline recession that results from seal level rise.  Bruun Factor 100 shoreline recedes horizontally 100 times the vertical rise.  Bruun Factor 50 shoreline recedes horizontally 50 times the vertical rise. 
  • MHWS (Mean Height Water in Spring)
    Average height of two successive high tides during spring when rage of the tide is greatest.
  • AEP 1% (Annual Exceedence Probability)
    The measure of the likelihood (expressed as probability) of an event equalling or exceeding a given magnitude in any given year.

The online erosion and inundation mapping tool will be available for use in August 2018 aligning with Community Workshop 1.  Below are samples of what the mapping tool is predicting:

Hazard mapping

Emu Bay - potential coastal erosion

Emu Bay Hazard Map        Key for Emu Bay Hazard Map

 

Reeves Point, Kingscote - potential coastal erosion

Hazard Mapping Reeves Point

Brownlow - potential coastal erosion

Hazard Mapping Brownlow

Penneshaw - potential coastal erosion

Hazard Mapping Penneshaw

Nepean Bay - potential storm tide impacts

Hazard Mapping Nepean Bay

American River - potential storm tide impacts

Hazard Mapping American River

Brownlow & Cygnet River Outlet - potential storm tide impacts

Hazard Mapping Brownlow & Cygnet River

Key Brownlow & Cygnet River
Wisanger - potential storm tide impacts

Hazard Mapping Wisanger    Hazard Mapping Key Wisanger

The ProjectCoastal Hazard Mapping Image

Kangaroo Island Council obtained funding through the Natural Disaster Resilience Program to undertake a pilot coastal hazard mapping project for sections of the Kangaroo Island coast (subject to LiDAR data availability).   

The focus on coastal hazards associated with current and projected sea level rise aligns with the outcomes of the Resilient Hills and Coasts (RH&C) Regional Climate Change Adaptation Plan, which identified built coastal assets as one of four priority areas of adaptation on Kangaroo Island. 

The key outputs of the project are:

  • Detailed modelling using LiDAR data to develop future erosion and flood scenarios.
  • Analysis of the modelling to inform decision making.
  • Development of a communication and engagement strategy aimed at working with the community to build capacity and resilience.
  • Final report that assesses response options and makes recommendations to Kangaroo Island Council on adaptation actions.
  • Preparation and distribution of a case study to promote and inform similar exercises in other council areas. 

 

Kangaroo Island Council | 43 Dauncey St (PO Box 121) KINGSCOTE SA 5223
Phone: 08 8553 4500 | Fax: 08 8553 2885 | Email: kicouncil@kicouncil.sa.gov.au
Kangaroo Island Weather
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