coastal management in the netherlands

Coastal Management in the Netherlands Four decades of learning [email protected]

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Page 1: Coastal management in The Netherlands

Coastal Management in the NetherlandsFour decades of learning

[email protected]

Page 2: Coastal management in The Netherlands

Why are we here?

Page 3: Coastal management in The Netherlands

’70s

escarpments,erosion

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’70s

Narrowbeaches

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’80s

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’80s

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1990

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Marram grass, reed and willowbranches

http://www.google.nl/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCNiww6ejq8gCFcrUGgodbwIPTQ&url=http://www.goudenpiramide.nl/gouden-piramide-2015/inschrijvingen-2015/detail/q/userapplication/315&bvm=bv.104317490,d.bGg&psig=AFQjCNFsMieX7ZHKEHBGsOJwe-o91pvGjg&ust=1444132576416418

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Foreshore nourishment

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Beach nourishment

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Why manage? safety standards for floodprotection

<-100m ->

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http://www.google.nl/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCJi-xZ2tnMgCFQbPFAodbWMDWw&url=http://hobby.blogo.nl/2008/08/09/ganzenlampion-sfeer-lampion-maken/&psig=AFQjCNFwKIzgEsRqongic1psaNIstpgC7A&ust=1443619847543349

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Dunereinforcement

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Reference coastline (1990)

• Sand nourishments on beach and foreshore

• Adding a lot of sand to achieve a dynamic equilibrium

• Coastline retreat was stopped

• Further loss of land prevented.

• Morphological changes: foredune development, locallynarrow beaches due to dune growth

• Difficult to manage,

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Local blowout at Wassenaar : monitoring morphological changes

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Present day

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Present day

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Present day

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Present day

• Less storm damage (fewer storms?)

• Predominantly limited to foredunes

• System (sand volumes) restores itself -> cheap, but unpredictable and difficult tot manage

• Will it last?

• can we benefit even more from the dynamic processes?

• How does it really work?

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