Coastal Resilience

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Contents

Traditional approach

Current trends: Coastal Resilience Soft measures

Example projects Dune creation ‘Sandengine’ Artificial reef Natural material

Traditional Approach

Single problem owner Non-integrated approach Single aim: safety

No socio-economic review No interest in environment

Hard measurements

RESULTS Damaging impact

Loss of habitat & environment Erosion other locations

Coastal Resilience

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impact

probability

Present risk

Present risk

Futurerisk

Futurerisk

Futurerisk

Futurerisk

Futurerisk

Futurerisk

Futurerisk

Futurerisk

Improvement works

Improved hazard & warning preparedness

developments

Climate change

Future risk

Traditional Approach: Brittle failure

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Coastal Resilience

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What is Resilience? Ability to withstand conditions beyond its design

without catastrophic failure

Combination of solutions Knowledge of interaction of the components Understanding risk & failure mechanisms Solution serves whole life performance not a

standard

Soft Measures

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“Soft where it can – hard where it must” Emphasis on non-structural measures

Spatial planning Public awareness Flood warning

Natural materials (Armoured) earth levees Rocks & stones Sand nourishment

Flexible No large CapEx - Investments spread Environmental friendly

Nourishment: Dune development

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“Sand Engine” (TUD/Deltares)

Not only beach, also under water

Sand requirements Dutch Coast rise 12 Mln m3 20 Mln m3

Sand nourishment –

new peninsula

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Artificial Reef

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Natural Material: The Palms

Palm Jumeirah – Palm Jebel Ali – Palm Deira

REQUIREMENTS:

Shamal winds 10-15 m deep sea Limitation of wave run-up and overtopping Protection at minimum costs Natural look and feel, environmentally sound

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Natural Material: The Palms

DESIGN:

Use natural materials (coarse) sand, quarry run and rocks up to about 5 to 6 tonnes

Limit crest level to 1 m above reclaimed island to not disturb the view on the sea

Recreate life-sustaining ‘ecological networks’ on a massive scale

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Natural Material: The Palms

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Artificial Reef – Natural Material: The World

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