質(zhì)點跟蹤法及其應用.pdf

1、華東師范大學碩士學位論文質(zhì)點跟蹤法及其應用姓名：陳昞睿申請學位級別：碩士專業(yè)：自然地理學指導教師：朱建榮20050601AbstractThenumericalschemeoftheadvectiontemlshouldbedesignedcorrectlyforthefrontsofsharpconcentrationgradientstopreventexcessivenumericaldiffusionordispersionwh

2、encalculatingInasstransportintheareasofestuaryandcoastSomebasicschemes，suchascentraldifferencing，upwindandLax—wen&offareeitherhighlydiffusiveorextremelydispersiveEulerianLagallgianMethod(ELM)canpreventthedispersionwhilel

3、owerthediffusion，butitsdiffusionisstillconsiderable，SOitisnecessarytobefurtherimprovedInaddition，ifthehorizontalinterpolationprocesswastakenina6plain，thenthebended巧plainwouldmaketheinterpolationsourcesunreasonableSointhi

4、spaper，ftrst，theELMisimprovedbytakingtheinterpolationprocessunderabsolutecoordinates，SOthatthehorizontalinterpolationcouldbetakeninahorizontalplainofthesamealtitude，thustheproblemofuvxeasonableinterpolationsourcesispreve

5、ntedThen，theParticle—tracingMethodisdesigned，whichcalculatestheadvectiontermbysettingsomeparticlesinthe鰣dcellsandtracingthemWithoutrepeatedinterpolationssuchasinELM，theParticletracingMethodreducesthenumericaldiffusionqui

6、tealotTheIOWdiffusionoftheParticletracingMethodisshowninaonedimensionalexperimentandatwodimensionalone，whiletheimprovedELMperformsbetterthantheoriginalELMinthetwo—dimensionalexperimentFinallyunderthethree—dimensionalECOM

7、model，theParticle—tracingMethodisappliedtOthenumericalmodelingoftheChangiiangEstuarysewagediffusionInthismodeling，theParticle一訂acmgMethodisagaincomparedwiththeimprovedELMbycalculaftngtheconcentrationofCODTheresultshowsth

8、attheParticletracingMethodisnotonlylessdiffusive，butalsomoreconservativeMeanwhile，bymodelingthesewagediffusion，itisfoundthattherangeoftheChanNiangEstuarysewagediffusionareacanreachtheEastChongmingBank，theDeepwaterChannel

9、，andtheNanhuiBank，whiletheCODconcentrationnearMeimaoshaisespeciallyhi曲SOthatthesewagediffusionconstitutesathreattothewaterqualityofMeimaoshaareaKeywords：advectionterm；numericalscheme；ParticletracingMethod；sewagediffusion