Hondsbossche Dunes.

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Presentation transcript:

Hondsbossche Dunes

Battling the sea since 12th century 1388; first small sand dyke 4th village built

Assessment 2004; failed Stability Gras revetment Overtopping

Directive Safety+ spatial quality 50 year Cooperation of Hoogheemraadschap, Province Noord-Holland, Rijkswaterstaat

Three alternatives

Stakeholders, inhabitants

Preferred option… Sand! Safe Opportunities for nature, recreation, tourism Adaptable to climate change Support from stakeholders Impact on environment negligible (landscape) Building within 1 year

Signing collaboration agreements PNH, RWS en HHNK Spatial quality Signing collaboration agreements Nature

In figures Het ontwerp Max budget € 250 mil, incl 20 years maintenance 8 km beach 6 km dunes 35.000.000 m³ sand Max budget € 250 mil, incl 20 years maintenance Contract: Design, construct, maintenance (20 year) Het ontwerp

Nature mitigation measures Elastocoast on groynes Flood (high tide) water refuge for birds Higher rubble stone zone on Texel

In strong collaboration with contractor Knowledge and experience Creative solutions and innovative techniques Contractors communicate directly to stakeholders Winner on both price and quality: Technology, nature, recreation and inconvenience Contract; construction and 20 years of maintenance

Werkvolgorde en planning Building period Werkvolgorde en planning 3-3-2014: First under water nourishment 8-3-2015: Minister Schulz declared the coast safe

Start on 3 march 2014 Vooroeversuppletie met 3 sleephopperzuigers

Tourist attraction

Lessons Learned Joint cost benefits standards (with nature reservation organisation) Describe consequences for management and maintenance for both nature and sand Prior agreements about exchange of data Prior evaluation of value for landscape by independent experts

Research Reduce uncertainties under- water design (Phd) Wind-sand transport (MSc) Under water sand losses (MSc) Nature 2000 predictability and optimisation of design (Ecoshape) Optimal slope/height/width of dunes Vegetation Ground water levels Collecting data for next steps (HHNK) Ground water Height/depth measurements Storm chasers team? Publish raw data for research and design community

RWS & la Mer (2014-2017) HHNK (2013-2020/2035) Excavation permit (ecologie) NB-permit (ecology, hydrology) Van Oord & Boskalis (2015-2035) Maintenance (morphology, ecology, hydrology) HHNK– universities Sand drift, dune development, management measures (morphology) EcoShape (2015-2018) Nature based solutions (morphology, ecology, hydrology)