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UrbanfloodissuesandanalysisintheGuangdong - HongKong - MacaoGreaterBayArea
1,2,3
1,2,3
ZHANGZhilin 1,2,3 ,QIUJing 1,2,3 ,CHENGTao ,HUANGBensheng 1,2,3 ,FENGZiying
(1.GuangdongResearchInstituteofWaterResourcesandHydropower,Guangzhou 510635,China;
2.GuangdongWaterSecurityCollaborativeInnovationCenter,Guangzhou 510635,China;
3.SouthernMarineScienceandEngineeringGuangdongLaboratory(Zhuhai),Zhuhai 519000,China)
Abstract:UrbanfloodingintheGuangdong - HongKong - MacaoGreaterBayareahasbecomeincreasinglyserious
inrecentyears.ThispapercombedthetypicalfloodeventsintheGreaterBayArea ,summarizedthecharacteristics
offlooding,andanalyzedthemaindrivingfactors.Theresultsshowthatformorethan100years,theannualpre
cipitation ,theaveragedailyrainfall,andthenumberofrainstorm daysshowanupwardtrend,whiletherainfall
dayhasdecreased ,whichindicatesthatrainfallisincreasingandtendstoconcentrate.Thetemporalandspatial
distributionofrainfallisuneven.Inrecenttenyears,therainfallinthefloodseasoninGuangzhou,Dongguan,
andHuizhouaccountsfor81% oftheannualrainfall,andtherainfallduringthedragon - boatraininGuangzhou
accountsforabout22% oftheannualvalue.Besides,althoughtheurbanagglomerationintheGreaterBayArea
presentsaheatislandeffect,andthetemperatureineachcityhasincreasedandispositivelycorrelatedwithrain
fall;therelationshipbetweenrainfallandurbanizationrateineachcityisnotobviousduetotheinfluenceofgeo
graphicallocation ,whilethecoastalcitiesinthelowerreachesarefacingmorefrontalrainandtyphoonrain.Inthe
pastdecade ,47typhoonsbroughtheavyrainormoretotheGreaterBayArea,occurringfrom JunetoOctober,
amongwhich21coincidedwiththeastronomicaltideand26landedinthewestoftheGreaterBayArea.Inaddi
tion ,therateofsealevelrisealongthePearlRiverEstuaryinthepast40yearswas3.5mm?a,higherthanthena
tionalaverage ,andtheriseofsealevelinthefuturemaybringnewriskstotheGreaterBayArea.Theanalysisof
heavyrainfall ,typhoonsurge,andsealevelchangecanprovideanimportantreferencefordisasterpreventionin
thisarea.
Keywords:Guangdong - HongKong - MacaoGreaterBayArea;urbanflooding;extremerainfall;typhoonsurge;
sea - levelrise;climatechange
(责任编辑:李福田)
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