簡介:PROCEEDINGSOF2008NSFENGINEERINGRESEARCHANDINNOVATIONCONFERENCE,KNOXVILLE,TENNESSEEGRANT0530759EXPERIMENTALSIMULATIONOFTSUNAMIHAZARDSTOBUILDINGSANDBRIDGESHRRIGGS,IANNROBERTSON,KWOKFAICHEUNG,GENOPAWLAKUNIVERSITYOFHAWAIIATMANOAYINLUYOUNGANDSOLOMONCSYIMPRINCETONUNIVERSITYOREGONSTATEUNIVERSITYABSTRACTTHISPROJECTINVESTIGATESTSUNAMIHAZARDSFACEDBYCOASTALINFRASTRUCTURETHROUGHEXPERIMENTALANDNUMERICALSIMULATIONPRIMARYFOCUSOFTHEINVESTIGATIONISONSCOURANDFLUIDLOADSFROMRUNUP,INUNDATION,ANDDRAWDOWNWHENTSUNAMIBORESHITSTRUCTURESTHEFOCUSOFTHEEXPERIMENTSISTOOBTAINQUALITYDATATHATCANBEUSEDTOVALIDATENUMERICALMODELSANDCODESTHEOBJECTIVEOFTHISPAPERISTODOCUMENTTHECOMPLETEEXPERIMENTALSETUPSASWELLASTHESEQUENCEOFEXPERIMENTSANDTOPROVIDESOMEPRELIMINARYDATATHEPAPERWILLPROVIDEAREFERENCEOFTHEEXPERIMENTALDESIGNTHATSUBSEQUENTPUBLICATIONSCANCITE1INTRODUCTIONCOASTALINFRASTRUCTURESUCHASBUILDINGS,BRIDGES,HIGHWAYS,ANDHARBORFACILITIESNEARSHORELINESTHATARESUSCEPTIBLETOTSUNAMIINUNDATIONAREATRISKOFSIGNIFICANTDAMAGEIFTHESTRUCTURESARENOTADEQUATELYDESIGNEDFORSUCHLOADSTHE2004GREATINDIANOCEANTSUNAMIDEMONSTRATEDTHIS,ANDTHEDEVASTATIONHASBEENWELLDOCUMENTEDREF13SHOWCLEAREXAMPLESOFDAMAGEASARESULTOFBOTHSCOURANDFLUIDLOADINGFROMTHATTSUNAMITHESTRUCTURALDAMAGEISVERYSIMILARTOWHATCANHAPPENFROMHURRICANESTORMSURGEANDWAVESSUCHDAMAGEFROMHURRICANEKATRINAISSHOWNINFIGURE1–FIGURE3FIGURE1US90BRIDGEFROMBAYSTLOUISTOPASSCHRISTIANSHOWINGDISLOCATIONDUETOBUOYANCYANDHYDRODYNAMICLOADS4FIGURE2DOUBLETEENEGATIVEBENDINGFAILUREINPARKINGSTRUCTUREATGRANDCASINO,BILOXI–BOTTOMPICTUREISINSETFROMTOPPICTURE5ALTHOUGHTHEREARESOMECLEARDIFFERENCESBETWEENTHEDAMAGEMECHANISMSOFTSUNAMIANDHURRICANESURGE/WAVES,THEREAREALSOSIMILARITIESANDTHERESULTINGDAMAGEISSTRIKINGLYSIMILARTHETSUNAMITHREATHASBEENRECEIVINGINCREASEDATTENTIONARECENTSPECIALISSUEOFTHEASCEJOURNALOFWATERWAY,PORT,COASTALANDOCEANENGINEERINGFOCUSEDONTSUNAMIENGINEERING,WHICHWASDEFINEDAS‘THOSEACTIVITIESTHATARESIGNIFICANTFORTHEENGINEERINGGOALOFDESIGNINGANDPROTECTINGTHEBUILTENVIRONMENTANDTHEPEOPLETHATDWELLTHEREIN,WITHREGARDTOPOTENTIALTSUNAMIHAZARDS’6UNFORTUNATELY,DESIGNERSNSFGRANT0530759NSFPROGRAMNAMENEESRESEARCHPROCEEDINGSOF2008NSFENGINEERINGRESEARCHANDINNOVATIONCONFERENCE,KNOXVILLE,TENNESSEEGRANT0530759THEWAVEMAKERISAPISTONTYPE,ELECTRICMOTORITCONSISTSOF29BOARDS,EACH20MHIGHREGULAR,IRREGULAR,ANDTSUNAMISOLITARYWAVESCANBEGENERATED,BOTHSINGLEANDMULTIDIRECTIONALTHEWAVEPERIODSRANGEFROM05STO10STHEPISTONSHAVEAMAXIMUMSTROKEOF21MANDAMAXIMUMVELOCITYOF20M/SINFORMATIONONTHEFACILITYCANBEFOUNDONTHEWEB13UNFORTUNATELY,THETWBDOESNOTHAVEARECONFIGURABLEBEACH,ANDBEACHCONFIGURATIONSFORSPECIFICPROJECTSMUSTBECUSTOMMADEFOROUREXPERIMENTS,WEREQUIREDANUMBEROFBEACHSLOPESANDFRINGINGREEFCONFIGURATIONSITWOULDHAVEBEENTOOEXPENSIVE,ANDTAKENTOOLONG,TORECONFIGUREBEACHESTHATSPANNEDTHEENTIRE265MWIDTHOFTHEBASININADDITION,TOOBTAINTHEDATAREQUIRED,WEWEREMOSTLYINTERESTEDINTWODIMENSIONALFLOWASARESULT,WECONSTRUCTEDTWOCONCRETEWALLSALONGTHELENGTHOFTHEBASINTOCREATETHREECHANNELS,TWOOFWHICHARE216MWIDEANDAREUSEDINOUREXPERIMENTSFIGURE5THEOUTERWALLHASTHREE11MX07MPLEXIGLASVIEWPORTSDOWNSTREAMTOOBTAINAVERTICALPLANEVIEWANDVIDEOCAPTUREOFTHEFLUIDFLOWANDSEDIMENTTRANSPORTTHEREMAINDEROFTHEBASIN,APPROXIMATELY218MWIDE,ISUSEDBYOSUFORUNRELATEDTSUNAMIEXPERIMENTSANDFORAPAYLOADPROJECTALLTHREECHANNELSEXPERIENCEDTHESAMEWAVEFIELDS,WHICHWERECONTROLLEDBYOURTESTSFIGURE4TSUNAMIWAVEBASINTWB13OUREXPERIMENTSREQUIREDFIVESETSOFBASICBEACHCONFIGURATIONSTWOWITHACONSTANTSLOPEFROMTHEBOTTOMOFTHEBASINATSLOPESOF110AND115,ANDTHREEWITHBEACHSLOPESOF15,110,AND115ANDAFRINGINGREEFINTHECASESOFAFRINGINGREEF,THEBEACHSLOPETERMINATEDATANELEVATIONOF1MABOVETHEBASINBOTTOMANDWASHORIZONTALTHEREAFTERTHEBASICCONFIGURATIONISSHOWNINFIGURE6FORTHE110BEACHSLOPEWITHREEFFORTHERUNUP/INUNDATIONSTUDIESANDTHESTRUCTURALLOADINGSTUDIES,THEBEACHWASCONCRETEEXCEPTFORTHE115SLOPE,THEUPPERPORTIONOFWHICHWASASTEELPLATEFORTHESCOURSTUDIES,THESLOPEWASCREATEDBYSANDWATERDEPTHSOF10,105,110,AND115MWEREUSEDWAVEHEIGHTSFROM01TO06MININCREMENTSOF01MWEREUSEDWHILETHEFOCUSWASONSOLITARYWAVES,TOMODELATSUNAMI,SOMECNOIDALANDSTORMWAVESWEREALSORUNTOOBTAINABROADERRANGEOFDATAFIGURE5CHANNELSINSTALLEDINTWBINTHEFOLLOWINGSECTIONS,THEEXPERIMENTALSETUPSANDRESULTSFROMEACHOFTHETHREETHRUSTSAREDISCUSSEDINMOREDETAIL3WAVEENERGYDISSIPATIONTHECOASTLINESAROUNDHAWAIIANDOTHERTROPICALLOCATIONSAREFRONTEDBYFRINGINGREEFS,WHICHTYPICALLYCONSISTOFASTEEPREEFFACEANDASHALLOWREEFTOPWITHHIGHLYIRREGULARSURFACETHESELARGECOASTALFEATURESBETWEENLANDANDOCEANMAYHAVESIGNIFICANTIMPLICATIONFORTSUNAMIHAZARDSASSESSMENTANDMITIGATIONAPARTFROMANECDOTALREPORTSOFTSUNAMIDAMAGEORLACKOFDAMAGETOCOASTLINESWITHREEFSTRUCTURES,ASYSTEMATICSTUDYOFTHEPROTECTIONPROVIDEDBYFRINGINGREEFSTOCOASTALINFRASTRUCTUREISNOTIMMEDIATELYEVIDENTFIVESERIESOFEXPERIMENTSWERESPECIFICALLYDESIGNEDTOINVESTIGATETSUNAMITRANSFORMATIONANDENERGYDISSIPATIONOVERFRINGINGREEFSTHETWOCONSTANTSLOPEEXPERIMENTSAREPRIMARILYUSEDTOTESTTHEEFFECTSOFBEDFORMROUGHNESSONTSUNAMIBOREFORMATIONANDENERGYDISSIPATIONTHETHREEREEFCONFIGURATIONSWEREDESIGNEDTOCOVERNATURALFRINGINGREEFPROFILESGATHEREDFROMOAHU,HAWAIIANDGUAM,MARIANAISLANDSFORSOMEOFTHETESTS,AREEFCRESTISADDEDATTHEREEFEDGETOCREATEASHALLOWLAGOONBEHINDFIGURE6SHOWS,FOREXAMPLE,THEEXPERIMENTALSETUPFORTHE110REEFCONFIGURATIONARESISTANCEWAVEGAUGENEARTHEWAVEMAKERRECORDSTHEINCIDENTWAVEPROFILE,WHILEGAUGESPLACEDAT1MINTERVALSOVERTHEREEFFACERECORDTHEPROFILETRANSFORMATIONTHEFORMATIONOFTHEBORESATTHEREEFEDGEANDTHECORRESPONDINGVELOCITYPROFILEARECAPTUREDBYFOURADVSMOUNTEDFROMABRIDGEACROSSTHEFLUMEASERIESOFPRESSURE
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