珠江口与邻近海域环流潮汐高分辨率数值模拟分析

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1、万方数据大，90天内可达190km，且粒子运动呈螺旋状推进。关键词：珠江口；潮汐；潮流；水交换；海水滞留时间；数值模拟；FVCOM万方数据Three—‘DimensionaIHigh—。ResoIutionNumericaIStudyoftheTideandCirculationinthePearlRiverEstuaryandtsadjacentWatersAbstract：Basedonanunstructuredgridandfinite-volumecoastaloceanmodel(FVCOM)，i

2、ncludinghighlyaccuratecoastlineandbathymetrydata，athree—dimensionmodelwithhighresolutionisconstructedinthePearlRiverEstuaryanditsadjacentseaareatOreproducetides，tidalcurrentsandresidualcurrents．Thecomparisonbetweenobservationsandnumericalmodelingindicatesth

3、atthecomputingresultsfitthemeasuredvalueswell．Moreelaborateco-tidalchartsandpicturesoftidalcurrentellipseofthefourprincipaltideconstituentsaswellasfiguresoftides，tidalcurrentsandresidualcurrentsillustratecharacteristicsoftidesandcirculationintheresearcharea

4、s．TheresultsshowthatthereismixedsemidiurnaitideexistinginthePearlRiver,andthetide-typefactorrangesfrom1．1toI．3．Intheestuary,thetidalamplitudeintheeastsideishigherthanthatinthewestside，andthetideintheeastpropagatesmorequicklythanthatinthewest；thetidalcurrent

5、sismainlynorthwesternandsoutheasternwitharectilinear-currentmotion，andthemaximumcurrentvelocityappearsinthechannel；theresidualcurrentinthechannelflowstowardsthesouth，influencedbydrainageoftherunoff,whileinthewesternshoaloftheestuary，itflowstowardsthenorth，w

6、hereastmctureofcirculationemerges．Thetidalenergyfluxpropagatingfromopensea，themaximumofwhichappearsinthewestandeastchanneloftheestuary,mostlyconvergesinthePearlRiverEstuary，andcirclescounterclockwisearoundQi’aoIsland．Thestudycalculatedthetransportofestuarin

7、emassandthecapacityofwaterexchangeTheresultsindicatethat，withanimpactoftides，thecapacityofthewaterexchangeinthePearlRiverEstuaryisweakandtheresidencetimeofthewatersismorethan90days，．Therunoffandthewindstresscanenhancethecapacityofthewaterexchange，andtheresi

8、dencetimeofthedyeinthechannelandthewest(nearentrancesofthePearlRiver)isshorterthanthatinthewesternshoalandtheeast(awayfromentrancesofthePearlRiver)．Moreover，duringthefloodseason，themeanconcentrationoft