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福建东山湾潮流和余流特征研究.docx

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福建东山湾潮流和余流特征研究 Introduction DongshanBayislocatedintheeastofFujianProvince,China.AstheonlynaturalharborineasternFujian,thebayhasexcellentnaturalconditions,whichmakesitplaysanimportantroleineconomicandtransportationdevelopment.ThetidesandcurrentsinDongshanBayhavesignificantcharacteristics,whichhaveagreatinfluenceonthehydrodynamicenvironmentandwaterexchangecapacityofthebay.Therefore,itisessentialtostudythetidalandresidualcurrentsinDongshanBayforscientificandpracticalpurposes,includingenvironmentalmonitoring,coastalengineering,andmarineresourcemanagement. TidalCharacteristics Tideistheperiodicmotionofseawatercausedbythegravitationalattractionofthemoonandthesun.ThecharacteristicsoftideinDongshanBayaregenerallyaffectedbytheastronomicalandmeteorologicalfactors.Theastronomicalfactormainlyincludesthegravitationalattractionofthemoonandthesun,therotationoftheearth,andtherevolutionofthemoon.Themeteorologicalfactormainlyincludeswind,atmosphericpressure,andairtemperature. ThetidalrangeinDongshanBayisrelativelysmall,witharangeofabout1.5meters.Thetidalcycleismainlysemi-diurnal,andthetidalpatternismixed.Thehightideoccurstwiceaday,andtheintervalbetweentwohightidesisapproximately12hoursand25minutes.Thelowtidealsooccurstwiceaday,andtheintervalbetweentwolowtidesisabout6hoursand12minutes.Thetidalcurrentinthebayisgenerallyweak,withanaveragevelocityofabout0.2to0.3meterspersecond.Thetidalcurrentchangesdirectionevery6hoursandisaffectedbywindandotherhydrologicalfactors. ResidualCurrentCharacteristics Theresidualcurrentisthenetflowofseawaterinacertainperiodafterdeductingthetidalcurrentcomponentandthewind-drivencomponent.TheresidualcurrentinDongshanBayismainlyaffectedbythetopographyofthebay,theriverflow,andotherlocalhydrologicalfactors.Theresidualcurrentisgenerallystrongerthanthetidalcurrent,anditsdirectionismainlyinfluencedbythewind,whichvariesseasonally. TheresidualcurrentinDongshanBayischaracterizedbyacounterclockwisecirculationpatternduringthefloodtideandaclockwisecirculationpatternduringth