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Missie En Visie TU Delft Sand Engine CEDA Technical Visit Jaap van Thiel de Vries ([email protected]) Matthieu de Schipper Simeon Moons Challenge the future 1 Outline Introduction: • Why a Sand Engine? • Design & construction • Monitoring and Science • New applications? Development of the SandEngine • Morphology (Matthieu de Schipper) • Ecology (Simeon Moons) Challenge the future 2 Holland Coast: Policy context Shortage of natural sediment Egmond Consequence: Structural erosion Solution: Nourishments (10-15 mln m3/yr) City of Egmond Challenge the future 3 Dutch CZM Increase in nourished volumes Dynamic preservation of the 1990 coastline Sand volumes: • Since 1990: 6 mln m3/yr • Since 2001: 12 mln m3/yr Tendency towards larger-scale nourishments Uncertainties on environmental effects Prospect future : 40-85 mln m3/yr !! Extra functions nourishments (nature, recreation)? Challenge the future 4 Pilot project in the Randstad Area mega-nourishment! ‘Randstad’ Area The Hague • 3 M inhabitants • Urbanized / lack of nature • Majority below MSL R’damPZH Harbour = Province of Rotterdam South Holland Challenge the future 5 Delfland Coast Challenge the future 6 Design alternatives Full shoreface Peninsula Nourishment Hook Island Challenge the future 7 Let Nature do the work Challenge the future 8 Design Objectives: 1. Extra Safety 2. Nature area / ‘Quality of living’ 3. Innovation ‘Hook’ altenative 70 M Euro. 21 M m3 of sand Challenge the future 9 Expected advantages • enhanced safety against flooding • (first: wave attenuator; later: wider dune buffer) • cheaper per m3 compared to traditional nourishments • (but: costs brought forward → interest!) • longer period between consecutive nourishments • more time for beach and shoreface ecosystem to recover • ecologically interesting intermediate stages • beach lagoons, juvenile dunes, pioneer vegetation • recreation potential • swimming, surfing, beach recreation • wider dune area • increased freshwater reserve Challenge the future 10 Construction Suction hopper: • Pumping ashore • Bottom dumping • Rainbowing Challenge the future 11 Construction 28 maart 2011 28 april 2011 24 mei 2011 28 juni 2011 Challenge the future 12 12 Shoreface nourishment Shoreface nourishment Challenge the future 13 Pilot (1) We just started: Monitoring and Knowledge WHY? WHAT? Challenge the future 14 Did we meet our Goals? Safety; but also… Challenge the future 15 Challenging Governance Challenge the future 16 Inter-disciplinary Solution Challenge the future 17 Different time scale: Coastal Geology Engineering Storms et al. (2007) Challenge the future 18 Monitoring & knowledge projects: Applied Research Strategic Research • Tune data collection Monitoring • One DMS RWS STW • NCK network Knowledge EFRO NEMO Monitoring Nature Coast • End-Users MER Goals (International) Tools / Guidelines Shoreface Model Evaluation/ Maintenance Businesscase • Website / Wiki Utilisation Licenses DMS Challenge the future 19 Extensive monitoring campaign BEACH SURF Deep Challenge the future 20 ARGUS Camera Stations • http://argus-data.wldelft.nl/sites/zandmotor/2013/index.html • http://argus-data.wldelft.nl/sites/kijkduin/2013/index.html Challenge the future 21 Sustainable development of coastal areas worldwide • Increasing pressure on deltas worldwide • Ongoing need for coastal protection and marine infrastructure development • Pressures are reinforced by climate change • Increasing environmental awareness • Need for sustainable solutions Challenge the future 22 Explore new applications… ? ? ? ? Challenge the future 23 Questions / Discussion Challenge the future 24 Morphological development of the Sand Engine in the first years Matthieu de Schipper ( TU Delft / Shore Monitoring & Research ) R.C. de Zeeuw, S. de Vries, C. van Gelder-Maas and M.J.F. Stive Show and discuss the evolution of the Sand Engine • First ~ 20 months after completion • Drifter deployments With support of: Survey equipment Methodology Full bathymetry Summer 2011, 1 month after completion Animation surveys General observations • Erosion seaward side (‘tip’) • Sedimentation southern end • Spit and channel formation near lagoon • Symmetry Change outer contour Volume change per profile (dec’12-aug’11) 2000 1500 1000 500 Sedimentation / 0 / m alongshore] 3 [m Morphological Change Morphological -500 Erosion -1000 -1500 -1000 -500 0 500 1000 1500 2000 2500 3000 Alongshore [m] Sediment Budget Adjacent coast Total domain Peninsula only -1.6 million m3 Morphological response during a ‘stormy’ winter month Morphological response during a ‘quiet’ spring month Transect at the tip Scarp formation • Scarp height O (1-2 m) • Not only present after storms Southern side Southern side Infilling with ridges and runnels Northern side Northern side Spit and channel formation near lagoon Lagoon Entrance 1st spring after completion Vertical tide Tidal currents Infilling lagoon Implications for beach goers GVRB Lifeguards Difficult crossing of lagoon entrance •Flooding of spit combined with infilling flow • During rising tide Lagoon Entrance 2nd spring after completion Smaller scale dynamics Dynamics & Ecology Questions? [email protected] [email protected] @ShoreMonitoring With feb 2013 With feb 2013 Vloed stroming op dieper water Vloed stroming op dieper water Morphological Activity alongshore sections 30 Jan. 2013 Oct. 2012 25 Jul. 2012 20 Apr. 2012 15 Date Jan. 2012 10 Oct. 2011 5 Jul. 2011 0 -1000 -500 0 500 1000 1500 2000 2500 3000 Alongshore [m] Sediment budget Zonation Latest winter bathymetry Winter 2012, planview Scarp formation ~ 1,5 m! Spring 2012 For more info contact: Simeon Moons [email protected] www.naturecoast.nl Contents 1. Coastal ecosystem 2. Effects of nourishment 3. Sand Engine 4. Ecological Monitoring & Research 5. First Results Coastal Ecosystem Coastal Squeeze Erosion >70% world’s beaches Shore Nourishment Effect on the Coastal Ecosystem? Disturbance by nourishment activity Death by burial Alteration of the habitat Ecological Research 1. Effect on ecology: Mega vs Regular nourishment – Spatial – Temporal 2. Understanding the coastal ecosystem 3. Future applications Ecological Research Team Monitoring (RWS, EU) IMARES, Witteveen+Bos, Bureau Waardenburg, Vertegaal Ecologisch Advies, Arens Bureau voor Strand en Duinonderzoek NatureCoast (STW) Ecosystem services Timothy Price (VU) Terrestrial Marinka van Puijenbroek (WUR) Emily van Egmond (VU) Corjan Nolet (WUR) Marine Marjolein Post (IMARES) Simeon Moons (NIOZ) Sand Engine Monitoring Macrobenthos Sand Engine Monitoring Macrobenthos Fish Birds Sea mammals Vegetation Insects Ecological Research Terrestrial – Vegetation succession in existing dunes – Impact on community assembly in beach ecosystems – Biogeomorphology of dune formation Marine – Marine food webs in the shallow coastal sea – Benthic biogeomorphology in the shallow coastal sea For more info contact: Simeon Moons [email protected] www.naturecoast.nl .
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