台灣沿岸短週期水位訊號之現象分析

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1、Shorelinemodel-GENESISChangHsienKuo國立交通大學土木工程學系中華民國102年5月16日2One-LinemodelShorelinechange:1-D(One-Line)Constantshape:(DeanProfile)Bathymetricchange:2-D3One-LinemodelHansonandKraus(1989)–Generalizedmodelforsimulatingshorelinechange,GENESISVariationoflongshoresedimenttransportC

2、onstantbeachprofile4One-LinemodelHansonandKraus(1989)–Generalizedmodelforsimulatingshorelinechange,GENESISQ(x):longshoresedimenttransportq:sandsourceorsinkD=Db(tidalvariation)+Dc(closuredepth)=totaldepth5GENESISmodellongshoresedimenttransportSPM(1984),W:NumericalfactorOzasaan

3、dBramton,1980:longshoregradientinwaveheight~0.5>>breakingwavespredicted6GENESISmodelFlowchartPositionsofsomeshorelinesofdifferentyearsSettingparametersrequiredModelCalibrationforK1andK2Predictionoffuthureshorelinechange7GENESISmodelExample:I-Lanshoreline8GENESISmodelSpecified

4、parametersModelCalibration9GENESISmodelModelverificationandprediction10ScalesofmodelingapproachandusersofGENESISMorethan100011DiscussiononGENESISmodelJCR,1997Offshorewaves:regularwaveorobserved/calculatedwaves,H(t),T(t),θ(t)EngineeringStructuresandactivitiesEx:Beachprofile;Ga

5、tedboundaryofstructures:tipofthestructure12DiscussiononGENESISmodelLimitations:Inadequacyofdata:wavesClosuredepthPermeabilityfactor,transmissionfactorsfordetachedbreakwatersBoundaryconditions:laterBCorendBCRigorouscalibrationandverifications:numbersofshorelines13DiscussiononG

6、ENESISmodelRestrictionsPredictivereliabilityNotapplicabletosimulatingrandomlyfluctuatingbeach(e.g.Strom-inducedcross-shoresediment)Experience(trainedindividuals):complexityofbeachprocesses.PotentialerrorsalsoareinvolvedinthehindcastofincidentwavesToolsthatcanbemisusedandincor

7、rectresultsaremisinterpreted.14DiscussiononGENESISmodelAdvicesforusersItshouldbekeptinmindthattheassumptionsareidealizationsofcomplexprocessesandthereforehavelimitationsInlightofprofoundvariabilityofcoastalprocesses,itisclearthatasingleanswerobtainedwithadeterministicsimulati

8、onmodelmustbeviewedasarepresnetativeresultthathassmoothedoveralargen