Impact Analysis of Coastal Engineering Projects on Mangrove Wetland Area Change with Remote Sensing

(整期优先)网络出版时间:2008-02-12
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Inthepastdecades,twolargescalecoastalengineeringprojectshavebeencarriedoutintheDeepBaysurroundedbyShenzhenCityandHongKongSpecialAdministrativeRegion.OneprojectisShenzhenRiverchannelregulationandtheotheristheseareclamationalongtheseashoreontheShenzhenside.Thetwoprojectsareveryclosetothetwonationalnaturereserves,specificallyFutianinShenzhenandMaiPoinHongKong,whichareimportantwetlandecosystemsworldwide.ThispaperaimstoidentifyandmonitorthemangrovewetlandchangeswithtimeseriesofLandsatThematicMapperimagespreandposttothetwoengineeringprojectsbeinglaunched.Coupledanalysisoftheimageinterpretationresultsandtidaldataacquiredatthesametimeinthecontextofthetwoworksrevealsthatthemangrovewetlandareahasincreasedfromyear1989to1994,andhaschangedlittlefromyear1994to2002.Binarycodingisappliedtorevealthedistributionimageofmangroveateachphase,andthecodingimageshowsthattheconstructionofthetwocoastalengineeringprojectshascausedfrequentchangesinmangrovespatialdistribution.Thestudyalsoshowsthatthechangeisnotsignificantregardingtotheprecisionofthemethodandthenaturalevolutionofmangrovewetland,andtheprojectsdonotcauseapparentlyinfluencesuponthetwonationalmangroveconservationzonesatleastfortheresearchtimeperiod.