Lonstrup Løkken and Hjørring in the Dutch Coast Petra Goessen

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Presentation transcript:

Lonstrup Løkken and Hjørring in the Dutch Coast Petra Goessen

Safety standards of the Netherlands Dune and beach responsibilities Lonstrup Løkken and Hjørring, at the Dutch Coast…

9 mil people 70 % of BNP

70% below sea level

Agreements – introduction

Flood area after a breach % left behind Velocity of water

Note; But not cascading effects

Responsibilities at the coast since the 60’s Rws; Safety standards and software development Sand nourishment (dunes itself are within the water boards) (ca 200 km primary dykes, <500 km regional) Regional water authorities (water boards) All safety assessment, monitoring, inspections (for HHNK ca 3100 km primary dykes and dunes, 1400 km regional dykes) Maintenance of dunes for safety Provinces Safety standards and software development for regional dykes Nature zones Municipalities Building restrictions Clean beach

Adaptation strategy Prevention at all times Soft solutions as a rule Hard solutions only when needed Maintenance to follow sea level rise Sand beneficial for use of coast Learning by doing

Effects of nourishments Slowly growing with sea level rise Nourishments beats groins and hard constructions by far Less erosion Swimmers safety Good trust and experience Stormy / calm winters Beach width does not change; natural balance But; make place for sand! (beach huts and pavillions on the move)

Morphology/safety Regional water authority national water authority nature conservation province municipality

Spatial planning (coast pact) Regional water authority national water authority nature conservation province municipality

Communities of best practices Theme group water boards National knowledge platform Regional coast meetings; nourishments, long term issues Provinces, nature managers, municipalities, national and regional water authorities, chamber of commerce Community of beach managers; Municipalities of NH; beach management, short term issues NCK days; research institutes Kring of Coastal engineers; Are you interested in joining us?

Lonstrup strand concrete or brick building on asphalt

Lonstrup strand in Egmond

Lonstrup strand in Egmond WB; not allowed RWS; Not allowed

pavillion of wood on the beach √ WB; allowed Fall apart in 2,5x2,5 Or removed within 24 hrs X meters from dune foot Advise for minimum floor level RWS 10 m from high water level

Lonstrup building behind dune

Lonstrup building behind dune √ Prov: allowed! Rws+wb; no saying

Lonstrup building on top of dune

√ WB + prov; allowed Only in built areas Stand still principle; no negative effects to safety level Rws; no stakeholder

Hjørring building on top and dune foot enforcements

Hjørring building on top and dune foot enforcements WB and RWS; not allowed. To build; not safe! To maintain; no hard materials; for neighbouring effects; solidarity.

Løkken Strand beach hut winter

Løkken strand beach hut winter WB; not allowed RWS; Not allowed

Løkken strand beach hut summer

Løkken strand beach hut summer √ WB; allowed Fall apart in 2,5x2,5 Or removed within 24 hrs X meters from dune foot RWS; allowed - 10 m from high water level

WB/municipality/rws; nope. Good luck with that;), sand is not hard Safety of swimmers

Hirtshals

New research for optimal; design of huts and pavillions distances for huts and pavillions maintenance of beach, foreshore and dune

Smart phone technology for data collection

Egmond aan Zee