PROJECT SHEET BEACH MANAGEMENT WORKS EASTBOURNE, ,

BOSKALIS WESTMINSTER: SKILLS, FEATURES RESOURCES, EXPERIENCE Project Name Eastbourne Beach Recharge Boskalis Westminster provides clients with tailored, project-specific solutions for dredge related services, Client Eastbourne Borough Council as illustrated by the following project summary. Contractor Pevensey Coastal Defence Ltd

PROJECT DESCRIPTION Location Eastbourne, Sussex, United Kingdom Due to erosion by wind, waves and rising sea levels, Execution period Jan - Mar 2011 the beach front at Eastbourne needed to be reinforced. The previous campaign to improve coastal defence was carried out in 1998 and in 2011 the shoreline no longer fulfilled the design criteria for safe coastal protection.

Consequently Eastbourne Borough Council (EBC) developed a scheme comprising the recycling of existing material, particularly in environmentally sensitive areas (SSSI – Beachy Head) and the importing of bulk quantities for the rest of the beach frontage.

The sequence of the works was to execute the recycling first and subsequently fill the groyne bays to the required profiles with imported shingle.

The site stretched over a total length of 5.5 km, from Beachy Head in the west, along the whole of Eastbourne front, to Langney Point in the east. The design profile varied over the length of the site, with the aim of achieving a design crest width and height with seaward slopes of approximately 1 in 9. A

All dry earth moving was subcontracted to Ovenden A Location map who executed the works with up to 3 excavators, 4 B Works on the beach bulldozers and 10 dump trucks working at the same C Aerial View of Works time.

The imported shingle was mainly dredged at Owers Bank /Area 435. The material supplied complied with the design requirements, having a D50 in the order of 16m. B As this material had to be pumped ashore via an 1100m long sinker line, a heavy duty dredger with substantial installed power was needed. The Prins der Nederlanden was therefore mobilised, with a total of 19,000 kW installed capacity, every one of which was required during pump ashore.

C 07 — 2012 The information contained in this data sheet is for guidance purposes only and may be subject to changes. © Boskalis. All rights reserved. cargo, to become familiar with the most appropriate cargo, tobecomefamiliarwiththemostappropriate Dredging monitoredandtestedthegradingofeach the processandmaterialquality, Westminster 6,000-7,000 m³weredelivered.To optimiseboth cargoesof shallow approaches,dictatedthatpart almost 16,000m³,thedraftrestrictions,dueto locations. Althoughthe‘Prins’hasacapacityof approximately 1100mlongintwodifferentpipeline Nederlanden’ pumpingthroughasinkerpipeline trailing suctionhopperdredger‘Prinsder large solution involvedusingthestateofart vessel andthepumpingcapability. Theoptimum balance hadtobeachievedbetweenthesizeof In ordertoefficientlypumpthematerialashore,a approximately 35nauticalmilesfromEastbourne. identified asuitablesource,atOwersBank 50% smallerthan9mm.Westminster Dredging size between0.2mmand80mm,withnomorethan correctlyhadtohaveagrain the beachtoperform over shallowapproaches.Theshinglerequiredfor providing thecorrectequipmenttobringitashore difficulties ofbothsourcingasuitableshingleand Westminster Dredginghadtoovercomethepotential PROBLEM SOLVING January andFebruary. January the contractperiod,despitebeingcompletedduring delivering theschemebelowawardvalueandwithin providing compliantbeachnourishmentmaterialand approach tocontinuedimprovementresultedin the vesselforfirstthreedaysofdredging.This dredging lanes,andhadaproductionengineeron G E EASTBOURNE, SUSSEX,UNITEDKINGDOM EASTBOURNE BEACHMANAGEMENTWORKS months despiteworkingintheworstseasonofyear. up,executedandcloseddowncompletely inlessthan2 • Allworkswerestarted to protectthisnaturalhabitat. • Alllocalshinglevegetationwasfencedoffpriortocommencementoftheworks working days • 72,000m3ofrecyclingontheexistingbeachfrontwascarriedoutin12 total ofgross195,000m3shingleashorein15workingdays. bythePrinsderNederlanden,bringinga • 30loadsofshinglewereimported PROJECT HIGHLIGHTS: ensure nomembersofthepublicwereputatrisk. areas wereclosedoffbyfencingandmarshallspatrolledthebeachinorderto All centres andfishermen. including residents,businesses,tourists,watersports larly closecommunicationandliaisonwiththeclientvariousstakeholders the beachhadtobeclosedpublicforseveralweeks.Thisrequiredparticu As theworkshadtobecarriedoutoverwholesiteatsametime,almostall complaint. schemewithoutasinglethirdparty able indeliveringtheEastbourne the firsttenyearsoftwentyfiveyearadjacentPevenseycontractprovedinvalu knowledge gainedofboththelocalcommunityandbeachprocessesduring in whichtheyhaveacontrollingshare,toactasCommunityLiaisonOfficer. The oftheprojectmanagerfromPevenseyCoastalDefenceLtd, engaged theservices Westminster and approachwithEastbourne Dredgingadoptedapartnership COMMUNITY Wish Tower landmark.Thebeachfrontingthetownisofhighamenityvalue. recharge materialmarinedeliverieswererestrictedtothefrontageeastof beach intheeastoffrontage.Duetotheseenvironmentalrestrictions, Interest(SNCI)coversa700mlengthof Parade SiteofNatureConservation roughly paralleltothecoast,knownasHolywellReef.ThePrinceWilliam encompasses therockyforeshorecomprisingaseriesofgreensandreefsrunning Seaford toBeachyHeadSiteofSpecialScientificInterest(SSSI),which frontagelieswithintheboundariesof endoftheEastbourne The western SUSTAINABILITY ANDTHEENVIRONMENT G F E F

Prins DerNederlander Works onBeach Eastbourne Pier Eastbourne www.boskalis.co.uk [email protected] F +441489578588 T +441489885933 United Kingdom Fareham, HampshirePO155SS WestSegensworth 4 CromptonWay Westminster House Westminster DredgingCompanyLtd - -