25thFebruary2025
Settingthescene
CarolineTimlett
SouthHaylingcoastalprocessesandclimatechange
SamanthaCope
WestBeach
CarolineTimlett
25thFebruary2025
Settingthescene
CarolineTimlett
SouthHaylingcoastalprocessesandclimatechange
SamanthaCope
WestBeach
CarolineTimlett
Ourvisionistomanagecoastlines,improvecommunity resilienceandenhancethenaturalenvironment.
Fareham
GosportPortsmouthHayling Island
Havant
Chichester
25thFebruary2025
Settingthescene
CarolineTimlett
SouthHaylingcoastalprocessesandclimatechange
SamanthaCope
WestBeach
CarolineTimlett
SouthHaylingcoastalprocessesandclimatechange
Whatweknow
-Sedimenttransport -Increasedstorminessoverpast20years -Climatechangeprojections
-Floodandcoastalerosionrisk
SouthHaylingcoastalprocessesandclimatechange
Whatweknow
-Sedimenttransport -Increasedstorminessoverpast20years -Climatechangeprojections
-Floodandcoastalerosionrisk
Sedimenttransporthttps://www.scopac.org.uk/sts/
Howdoweknowthis?Monitoring
Geomaticssurveydata
NationalNetworkofRegionalCoastal MonitoringProgramme
https://coastalmonitoring.org/
Tracerstudies
NativepebblesarecollectedfromsiteandauniqueRadioFrequencytagissealedinside
Wehaveover10,000pebblesdeployedonthesouthcoast! https://southerncoastalgroup-scopac.org.uk/tracer-pebble-studies/)
Lidardifferenceplotandtracers
SouthHayling
Blue=accretion
Red=erosion Includes beach management activities
Sedimenttransporthttps://www.scopac.org.uk/sts/
Beachdifferenceplotsandtracers
South-westHayling
1832–2007(HaylingIslandBMP)
1963©OrdnanceSurvey
1984©HampshireCounty Council
Firstsection removed
Firsthaul routebuilt
Secondsection removed
SouthHaylingIslandBMP
•InitialbeachrechargeatEastokeundertakenin 1985,withbeachmanagementcontinuingto presentday.
•Themaintainedbeachreducesflood/erosion riskto1,555propertiesatEastoke.
•Onaverage,28,000m3shingleisrecycled annually,generallyacrosstwocampaigns (September&March).
•TheBMPsetsoutthekeysourcesofmaterial forworks,includingrecyclingfromthebeach, rechargefrommaintenancedredging,import viaroadandimportviapumpashore.
•OverallBMPcosts:£5.1m2024-2029
Pre-worksbeach condition,Hayling (10/03/23) Mid-works,Hayling (21/03/23)
Post-worksbeachcondition, Hayling(31/03/23)
SouthHaylingcoastalprocessesandclimatechange
Whatweknow
-Sedimenttransport -Increasedstorminessoverpast20years -Climatechangeprojections
-Floodandcoastalerosionrisk
DrMatthewWadey(BCPCouncil),Professor IvanHaighandAddinaInayatillah(UoS)
Weymouth
Boscombe
Milford
SandownBay
HaylingIsland
BrackleshamBay
Rustington
Chesil
WestBay
Increasingoccurrenceofswellandbi-modalevents
Waveheighttrend
Windwaveperiodtrend
Swellwaveperiodtrend
Wavedirectiontrend
Bimodalseastrend
Coastalmanagersfeltimpactofthisoverpastdecade,withmorefrequentbeach managementcampaigns,beachdrawdown,overtopping,flooding,re-activationofcliff erosionandassetdeterioration.
Weymouth
Boscombe
Milford
SandownBay
HaylingIsland
BrackleshamBay
Rustington
WestBay
Chesil
Increasingoccurrenceofswellandbi-modalevents
Pureswellevent1stFeb2021
Barelya1in4yrreturnperiodaccordingtotraditionalJointProbabilitymethods(waveheightandstillWaterLevel(©Dhoop,TCCO,2021). Infact-largestwaveenergy(Te)recordedin20years(©Dhoop,TandThompson,C2021).
1stFebruary2021:swellevent
NotjustcentralsouthcoastofEngland
SouthHaylingcoastalprocessesandclimatechange
Whatweknow
-Sedimenttransport -Increasedstorminessoverpast20years -Climatechangeprojections
-Floodandcoastalerosionrisk
GlobalTemperatureChange(1850-2023)
Governmentclimatechangeallowances
Sealevelrise(SLR)UKCP18
-Allprojectstoadoptthe“RepresentativeConcentrationPathway8.5(RCP8.5)highemissionsscenario70th%ile(for designpurposes)and95th%ile(forsensitivitytesting).”Thisequatesto1.2mand1.6mofSLRby2124respectively.
-Assumesglobaltemperatureincreaseof ~4.5degreesabovepre-industriallevelsin 100yearstime.2024averaged1.5degrees.
Extremestormsurgeevents
-AllprojectstouselatestCoastalFlood BoundaryDataset(CFBD2018).These includetheeffectsofextremewaterlevels +stormsurgesandastronomicaltides.
Increaseinwaveheight
-10%increaseappliedtowaveheight
SouthHaylingcoastalprocessesandclimatechange
Whatweknow
-Sedimenttransport -Increasedstorminessoverpast20years -Climatechangeprojections
-Floodandcoastalerosionrisk
WestBeachmonitoring
WestBeacherosionprojections
Currentarea ofstability
Continued cutback
Hotspotsoferosionand accretioncontinuein
LangstoneHarbourrun.
IOTBisactingasacontrolstructure, influencingcoastupdriftanddowndrift
Newareaofstability fromrecyclingand creationofhaulroute. Reliantonrecycling fromGunnerPoint. GunnerPointcontinues toaccrete.Relianton recycling.
WestBeachcontinues toerode
EastWinner continuesto accrete
-Nolongerastrongonshorefeedof materialatEastoke,hencetheBMP
-Sedimenttransportiseasttowest fromdriftdivideatEastoke,feeding SWHayling
-Increasedstorminessoverlast20 yearsimpactingcentralsouthcoast ofUK
-Governmentguidance-Sealevels arepredictedtoriseby~1.2mby 2125
Coastalprocessesandclimatechange
Whatweneedtoknow
-ImpactoffuturemanagementinterventionsoncoastalprocessesatSWHayling
-Betterunderstandingofswellandbimodalwaves
-Futuremonitoring
-ShorelineManagement
-JourneyatWestBeach
-Acollaborativeapproach -FAQs
WestBeach CarolineTimlett
ShorelineManagement
ThreeTiredApproachtoCoastalManagement
Tier1-NorthSolentShorelineManagementPlan(2010)
ThecoastalpolicyvariesalongthesouthcoastofHaylingIsland;froma‘HoldtheLine’policyattheeastand centralareasoftheisland,toanareaof‘naturalevolution’atWestBeachandGunnerPoint.
Tier2-HaylingIslandCoastalManagementStrategy
WestBeach(ODU10)Allowthecoasttoevolvenaturallyalongsideprivatemaintenanceorreplacementofdefencesor adaptationbylandowners
TheStrategydoesNOT…
xGuaranteephysicalworks
xGuaranteefunding
xRecommenddefenceseverywhere
TheStrategydoes
Identifyashorttermprogrammeof works
Outlinealongtermplanforcoastal management
Respondtofuturecoastalchangeover thenext100years
Provideapoliticallyendorsedmandate forfuturecoastalmanagement
EnvironmentAgencyapprovedStrategy
Betterprepared,better-informed residents
HaylingIslandCoastalManagementStrategy
Finalstrategyoptions
*PropertyResilience …modificationsaddedtoabuildingto loweritsfloodrisk.Itcanreducetherisk ofwatergettingintopropertiesand speeduprecoveryafteraflood.
WestBeach(ODU10)Allowthecoasttoevolvenaturallyalongsideprivatemaintenanceor replacementofdefencesoradaptationbylandowners
PolicyOverview JourneyatWestBeach
Timberseadefencesbuilt1976
InresponsetocoastalerosiondowndriftoftheInnonthe Beach,timberseadefenceswereconstructed.
HBCPolicyDecision2008
“Oncethecoastaldefencesreachtheendoftheirserviceable lifeorbecomeahealthandsafetyrisk,thestructuresshould beremovedandthebeachallowedtoevolvenaturally”.
Implementation
Failedandhazardoussectionsoftimberrevetmentand associatedgroyneswereremovedbetween2012and2021
HBCPolicyDecision2024
“Amodestcapitalinvestmenttowardsa‘DoMinimum’ collaborativeapproachwouldgivemorecertaintyinthis dynamicsituation”
1970’s
TheWestBeachtimberrevetmentandgroyneswereeffective andenableddevelopmentofthecarparkandprovisionofbeach huts.
PolicyOverview JourneyatWestBeach
Timberseadefencesbuilt1976
InresponsetocoastalerosiondowndriftoftheInnonthe Beach,timberseadefenceswereconstructed.
HBCPolicyDecision2008
“Oncethecoastaldefencesreachtheendoftheirserviceable lifeorbecomeahealthandsafetyrisk,thestructuresshould beremovedandthebeachallowedtoevolvenaturally”.
Implementation
Failedandhazardoussectionsoftimberrevetmentand associatedgroyneswereremovedbetween2012and2021
HBCPolicyDecision2024
“Amodestcapitalinvestmenttowardsa‘DoMinimum’ collaborativeapproachwouldgivemorecertaintyinthis dynamicsituation”
Despiteover£1millionofroutinemaintenancewhichhas extendedtheirlife,in2008thesetimberstructureswere identifiedtobeattheendoftheirlifeandtheCouncilagreedto notrepairofreconstructthesewhenfailureoccurred.
Timberseadefencesbuilt1976
InresponsetocoastalerosiondowndriftoftheInnonthe Beach,timberseadefenceswereconstructed.
“Oncethecoastaldefencesreachtheendoftheirserviceable lifeorbecomeahealthandsafetyrisk,thestructuresshould beremovedandthebeachallowedtoevolvenaturally”.
Failedandhazardoussectionsoftimberrevetmentand associatedgroyneswereremovedbetween2012and2021
“Amodestcapitalinvestmenttowardsa‘DoMinimum’ collaborativeapproachwouldgivemorecertaintyinthis dynamicsituation”
Followingaperiodofstormyconditions,failureofa150mofthe timberrevetmentoccurredin2012.Thissectionwasremoved, leavingonlythefrontingtimbergroynes.
AnincreaseinstormactivityalongthesouthcoastofEngland droveacceleratedcoastalerosionwhicheventuallyoutflanked thegroynesin2018,whichwerethenremoved.
PolicyOverview JourneyatWestBeach
Timberseadefencesbuilt1976
InresponsetocoastalerosiondowndriftoftheInnonthe Beach,timberseadefenceswereconstructed.
HBCPolicyDecision2008
“Oncethecoastaldefencesreachtheendoftheirserviceable lifeorbecomeahealthandsafetyrisk,thestructuresshould beremovedandthebeachallowedtoevolvenaturally”.
Implementation
Failedandhazardoussectionsoftimberrevetmentand associatedgroyneswereremovedbetween2012and2021
HBCPolicyDecision2024
“Amodestcapitalinvestmenttowardsa‘DoMinimum’ collaborativeapproachwouldgivemorecertaintyinthis dynamicsituation”
In2020furthersectionsofdefenceshaddeterioratedtoafailed statefollowingaseriesofwinterstormsandcontinuederosion andwereremoved.
Timberseadefencesbuilt1976
InresponsetocoastalerosiondowndriftoftheInnonthe Beach,timberseadefenceswereconstructed.
HBCPolicyDecision2008
“Oncethecoastaldefencesreachtheendoftheirserviceable lifeorbecomeahealthandsafetyrisk,thestructuresshould beremovedandthebeachallowedtoevolvenaturally”.
Implementation
Failedandhazardoussectionsoftimberrevetmentand associatedgroyneswereremovedbetween2012and2021
HBCPolicyDecision2024
“Amodestcapitalinvestmenttowardsa‘DoMinimum’ collaborativeapproachwouldgivemorecertaintyinthis dynamicsituation”
Leaving50mofthetimberrevetment(adjacenttoInnonthe Beach)andthetimbergroynesastheycurrentlyremaineffective.
Timberseadefencesbuilt1976
InresponsetocoastalerosiondowndriftoftheInnonthe Beach,timberseadefenceswereconstructed.
HBCPolicyDecision2008
“Oncethecoastaldefencesreachtheendoftheirserviceable lifeorbecomeahealthandsafetyrisk,thestructuresshould beremovedandthebeachallowedtoevolvenaturally”.
Implementation
Failedandhazardoussectionsoftimberrevetmentand associatedgroyneswereremovedbetween2012and2021
HBCPolicyDecision2024
“Amodestcapitalinvestmenttowardsa‘DoMinimum’ collaborativeapproachwouldgivemorecertaintyinthis dynamicsituation”
HaylingIslandCoastalManagementStrategy
WestBeach(ODU10)Allowthecoasttoevolvenaturally alongsideprivatemaintenanceorreplacementofdefencesor adaptationbylandowners
Dominimumadaptiveapproach
•Implementa"dominimum"adaptableandsustainable solutiontogainmorecertaintyonthecoastalevolutionof WestBeachdeliveringmutualbenefitstoallpartners
•TheHaylingGolfClubaredevelopingoptionstoprotect theirland.
•TheInnontheBeachownersareawareoftheriskthat theirbuildingcouldbelostinthenextfewyears.
•Byworkinginpartnership,thereistheopportunityto developaschemethatwillgivemoreconfidencetothe restofthecoastlineforthenext20-50years.
•Anysolutionneedstobesensitivetothecoastal managementpolicy,theenvironmentandfunding.
EnvironmentalDesignations
HaylingGolfClub
Removed defences
SSSI–nationallyimportantsite
ValuableVegetatedShingle,sanddunesand speciesrich,supportingpopulationsofUK’s scarceplantspecies.
Remaining Beachhuts
SpecialProtectionArea(SPA) &
SpecialAreasofConservation(SAC)
Remaining defences
Innon the Beach
OurCollaborative-Adaptiveapproach
FirstStage
EngagewithHaylingGolfClubandInnontheBeachtounderstandopportunitiesandenvironmentalconstraints
SecondStage
Agreeappropriateobjectives,governance,timelinesandfinancialcontributionsdrivers,opportunitiesandenvironmental constraints
Construction(subjecttofundsandconsents)2026-2027
RevetmentConditionFebruary2025
FAQs
Whatisthepolicyforthisarea?
‘naturalevolution’atWestBeachand GunnerPoint
Whyhasthetimberbeenremovedandnot replaced?
TheHavantBoroughCouncilpolicyforthesea defencesatWestBeachistoremovelifeexpired structuresastheybecomeahealthandsafetyrisk inlinewiththepolicyforthisarea.
Thestructureswerebeyondrepairandwouldneed acapitalreplacement.Thiswasunaffordableand notinlinewiththePolicy.
CanHBCbuildanewcarparkinland?
No.Inlandofthebeachisenvironmentally importantanddesignatedSSSI.
Canyoupredictwhatwillhappenoncethe defencesareremoved?
In2020AdaptationZoneshavebeendeveloped whicharepresentedinthefollowingfigureandwill informfuturelanduseplanningatWestBeachover thenext100years.
FAQs
CantheEnvironmentAgencyfundingforHaylingIslandbe usedfortimbermaintenance?
No.TheEAfundingawardedtoHBCistomanagefloodriskat Eastoke,throughtherecyclingandimportofshingletohelp reducefloodanderosionrisktothehighnumberofproperties andresidentshere.Thefundingcannotbeusedforthe maintenanceofcoastalstructures.
Who’sresponsibleforfloodriskmanagement?
Defra–Overallresponsibilityandfundingallocations
EA*–Strategicoversight–permissivepowers(no legalobligation)
HBC*–permissivepowers(nolegalobligation)
Landowners*–responsibletoprotecttheirownland
Thereiscurrentlynogov.fundingavailableto funddefencesatWestBeach.Fundingwill needtobethroughprivateowners.
Whatisthelong-termplanforWestBeach?
TheimportanceoftheInnontheBeachinmanagingthe widercoastlineisrecognisedintheHaylingIsland CoastalManagementStrategy,whichhighlightsthatit currentlyactsasdominantcontrolstructurewhichallows sedimenttoaccumulatetotheeast.Assuch,policyisto implementa"dominimum"adaptableandsustainable solutiontogainmorecertaintyonthecoastalevolutionof WestBeach Whowillpayforascheme?
*Mustactwithinstatutoryplanningregulationsandotherapplicablelegislationwithanappropriateengineeringsolutionthatis achievableandaffordable.
HISTORYOFWESTBEACH-FAQS:
https://coastalpartners.org.uk/project/history-of-west-beach-faqs/
BriefoverviewofWestBeach
https://coastalpartners.org.uk/project/brief-overview-of-westbeach/
ThankyouforListening
