Download South Australian Climate Change Adaptation

12/05/2016
Adaptation Pathways
Plotting a course to an uncertain future
Acknowledgements
John Rainbird - Torres Strait Regional Authority
Bob Speirs - Griffith University
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Sea level rise is real and
current
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Limited room to move
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Poruma – coral key
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Erosion on Poruma
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Poruma
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Warraber
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Saibai – mud island
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Saibai
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Badu
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The real face of the Torres
Strait
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Where is the Torres Strait
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Geology
• Alluvial mud deposit islands
• Coral keys
• Volcanic islands
• Mainland islands – extension of the great dividing
range
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Governance
• Decisions made by a governing group of elders
from each community
• Torres Strait Regional Authority
• Torres Shire Council
• Torres Strait Island Regional Council
• SLR immediate impacts in some communities more
than others
• Mud flats and coral keys
• Effects everyone
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Defend cost (top) vs
theoretical retreat cost
(bottom) (Harper, 2014)
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Pathways Map
Forced retreat likely
Sea level height (HAT)
above island benchmark (cm)
Do nothing – Investment in
emergency response to flood
incidents
Assess Impacts
· Flood Hazard mapping
· Infrastructure assessment
· Erosion assessment
Avoid – All new development in low
risk areas where possible
Accommodate
· Soft infrastructure – restore
coastal habitats
· Raise buildings
· Improve road construction
standards
Defend – Hard Infrastructure
0
5
10
15
20
25
30
35
40
45
50
55
60
Forced retreat likely
Hard infrastructure shows
signs of failing and further
upgrade costs prohibitive
Accommodation options
show signs of failure
Accommodation options
no longer effective
or technically not feasible
Critical failure of defences
Can continue for
critical areas at
escalating cost.
Retreat
Commence community
discussions
Identify suitable sites
Viability threshold
beyond which
community can no
longer adequately cope
Address legal issues and land
tenure
Address social and economic
concerns
Develop infrastructure
Move communities – Begins
with seasonal retreat.
Overall investment in sea level rise
impacts if action is taken.
Emergency Response
Assessment
Infrastructure
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20150609_230952075_iOS.jpg
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Forced retreat likely
Pathways Map
Sea level height (HAT)
above island benchmark (cm)
Do nothing – Investment in
emergency response to flood
incidents
Assess Impacts
· Flood Hazard mapping
· Infrastructure assessment
· Erosion assessment
Avoid – All new development in low
risk areas where possible
Accommodate
· Soft infrastructure – restore
coastal habitats
· Raise buildings
· Improve road construction
standards
Defend – Hard Infrastructure
0
5
10
15
20
25
30
35
40
45
50
55
60
Forced retreat likely
Hard infrastructure shows
signs of failing and further
upgrade costs prohibitive
Accommodation options
show signs of failure
Accommodation options
no longer effective
or technically not feasible
Critical failure of defences
Can continue for
critical areas at
escalating cost.
Retreat
Commence community
discussions
Identify suitable sites
Viability threshold
beyond which
community can no
longer adequately cope
Address legal issues and land
tenure
Address social and economic
concerns
Develop infrastructure
Move communities – Begins
with seasonal retreat.
Overall investment in sea level rise
impacts if action is taken.
Emergency Response
Assessment
Infrastructure
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Thank you
[email protected]
www.rohanhamden.com.au
+61 422 394 679
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