简介：TheresponseoftheSouthChinaSea(SCS)toTyphoonChanchu(2006)wasexaminedusingtheMM5andPOMmodel.InthePOMmodel,seasurfaceboundaryconditionswereforcedbythesimulationwindfieldfromMM5,thevelocityforcingwasintroducedintheeasternboundaryandthecomputationalschemesofheatfluxesatthesurfacewereintroduced.Comparisonwiththeobservationdatashowsthatthesimulatedresultsarereliable.IntheresponseprocessoftheSCStoTyphoonChanchu,theinfluenceoftheheatfluxesonthermalstructureoftheSCSwasregionallydifferent.Strongwindforcingwouldleadtoupwellingphenomenoninthelateralboundaryofdeepwaterbasin.Furthermore,theEkmanpumpingtheorywasusedtodiscusssubsurfaceupwellinganddownwellingphenomenonintyphoonforcedstage.

简介：第一条为统一全国年节及纪念目的假期,制定本办法。第二条全体公民放假的节日:(一)新年,放假1天(1月1日);(二)春节,放假3天(农历正月初一、初二、初三);(三)劳动节,放假3天(5月1日、2

简介：Theacousticperformanceofthestructureformeasuringcavitationnoiseistheoreticallyanalysed,andtwojudgingcriteriaoftheacousticperformanceofSTW（soundtransmissionwindow）arepresentedinthispaper.OneisofimpedancematchingbetweenworkingliquidandSTW:ρ1C1=ρ2C2.Theotherisofmaximumfrequency（orminimumwavelength）ofcavitationnoisespectrum:fmax≤c/60D(orλmin/D≥60).Ifeitherofthecriteriaismetreliablemeasuredresultsofcavitationnoisewillbeobtained.Thetheoreticalresultsareverifiedthroughexperi-ments.Accordingtothecriteria,thepaperanalysestheacousticperformanceofroutinelyusedplexiglassSTW.Theresultsshowthatintheresearchofclearwatercavitationtheimpedanceratio,2.18,doesnotsatisfyρ1C1=ρ2C2,andfmax≤C/60Dhardlyholdsforactualcavitationnoisespectrum.Therefore,plexiglassSTWisnotgoodenoughforsoundtransmission.Fromthispointofview,polyethyleneisbettersoundtransmissionmaterialthanplexi-glass.

简介：Usingtime-dependentcompressiblelaminarNavier-Stokesequationswithafinitevolumemethodincorporatingathird-order-accuratediscretizationscheme,theflowstructuresaroundaslenderatcertainincidencesarenumericalsimulatedandtypicalcrossflowpatternsarepresented.Atincidence10°,thesevorticalconfigurationsaredifferentatdissimilaraxiallocationsthoughtheyaresymmetric.At35°,thesymmetricvorticalstructuresstillmaintainovertheslender,yettheirinteractionatafterbodyisintensethanthatattheforebodysincethetwovorticeshavefullydevelopeddownstream.Theunstabletopologicalstructureoftrajectoryofsaddle-to-saddlepointsandmultiplelimitcyclearefurtherdiscussedintopologicalstabilitytheory.Thesestructureseasilyproducebifurcationwithperturbation.Theresultssupporttheviewofhydrodynamicinstabilityofvorticesflowfield.

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简介：Aquaticvegetationplaysanimportantroleintheflowstructureofopenchannelsandthuschangesthefateandthetransportofsediment.Thisarticleproposesathree-dimensionalturbulencemodelbyintroducingvegetationdensityanddragforceintothecontrolequationsofwaterflowinthepresenceofvegetation.Themodelwasusedtocalculatetheimpactsofsubmergedvegetationontheverticalprofilesoflongitudinalflowvelocities,thechangesofthedepth-averagedflowvelocitiesinacompoundchannelwithemergentvegetationinthefloodplain,theremovalofsuspendedsedimentfromthechannelsbyemergentvegetation,andthebedchangesaroundandinavegetatedisland.Numericalinvestigationsshowthataquaticvegetationretardsflowinthevegetationzone,reducesthesedimenttransportcapacity,andcontributestoerosiononbothsidesofthevegetatedisland.Calculatedresultsagreewellwithexperimentalresults.

简介：InthisarticletheUDFscriptfileintheFluentsoftwarewasrewrittenasthe'connectingfile'fortheFluentandtheANSYS/ABAQUSinorderthatthejoinedfilecanbeusedtodoaero-elasticcomputations.InthiswaythefluidfieldiscomputedbysolvingtheNavier-Stokesequationsandthestructuremovementisintegratedbythedynamicsdirectly.Ananalysisofthecomputedresultsshowsthatthiscoupledmethoddesignedforsimulatingaero-elasticsystemsisworkableandcanbeusedfortheotherfluid-structureinteractionproblems.

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简介：Theeffectofvegetationontheflowstructureandthedispersionina180ocurvedopenchannelisstudied.TheMicroADVisusedtomeasuretheflowvelocitiesbothinthevegetationcasesandthenon-vegetationcase.Itisshownthatthevelocitiesinthevegetationareaaremuchsmallerthanthoseinthenon-vegetationareaandalargevelocitygradientisgeneratedbetweenthevegetationareaandthenon-vegetationarea.ThetransverseandlongitudinaldispersioncoefficientsareanalyzedbasedontheexperimentaldatabyusingthemodifiedN-zonemodels.Itisshownthattheeffectofthevegetationonthetransversedispersioncoefficientissmall,involvingonlychangesofasmallmagnitude,however,sincetheprimaryvelocitiesbecomemuchmoreinhomogeneouswiththepresenceofthevegetation,thelongitudinaldispersioncoefficientsaremuchlargerthanthoseinthenon-vegetationcase.

简介：12月21日，安康张岭鑫洲家园34号、36号、38号住宅楼工程主体结构通过验收，质检、设计、地勘、监理及建设单位在进行了仔细而全面的现场检测后，提出验收意见，一致认为主体结构质量满足设计和规范要求，同意下道工序的施工，并对后续工程施工需注意的问题提出了具体要求。

简介：Thehydrodynamicdamperisadevicetodecreasethemotionofarmamentcarrierbyuseofthewaterresistance.Whenhydrodynamicdamperrushesintothewaterchannelwithhighvelocity,itisacomplicatedflowphenomenonwithfluid-structureinteraction,freesurfaceandmovinginterface.NumericalsimulationusingtheSmoothedParticleHydrodynamics(SPH)methodcoupledwiththeFiniteElement(FE)methodwassuccessfullyconductedtopredictthedynamiccharacteristicsofhydrodynamicdamper.Thewaterresistance,thepressureintheinterfaceandthestressofstructurewereinvestigated,andtherelationshipamongthepeakofwaterresistance,initialvelocityandactualdraughtwasalsodiscussed.Theempiricalformulawasputforwardtopredictthewaterresistance.Anditisfoundthattheresistancecoefficientiscommonlyintherangeof0.3≤C≤0.5,whentheinitialvelocityislargerthan50m/s.ItcanbeseenthattheSPHmethodcoupledwiththeFEmethodhasmanyobviousadvantagesoverothernumericalmethodsforthiscomplicatedflowproblemwithfluid-structureinteraction.

简介：Theproblemofwavepartial/fullreflectionandtransmissionbywave-permeablestructureisapproachedbysolvingtheshape-relatedfunctionwithfocusontheunderstandingofwaveattenuation.2Ddepth-averagedBoussinesqtypewaveequationsaregivenwithnewdampingiteminsimulatingthenonlinearwavetransmissionthroughwave-permeablestructure.1Dwaveequationisexaminedtogivetheanalyticalexpressionoftheabsorbingcoefficient,andiscomparedwithlaboratorydatainflumetocalibratethecoefficients,andtheexpressionisapplieddirectlyinmodifiedBoussinesqtypeequations.Comparedwithwavebasindataforvariousincidentwaveconditions,theaccuratepredictionsofcombineddiffraction-refractioneffectsinsimulatingnonlinearwavegoingthroughwave-permeablebreakwaterintheengineeringapplicationcanbeobtained.Itshowsthatwave-permeablebreakwaterswithproperabsorbingeffectscanbeusedasaneffectivealternativetomassivegravitybreakwatersinreductionofwavetransmissioninshallowwater.

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简介：2006年11月14日，陕西省水利厅在陕西院召开《陕西省水利电力勘测设计研究院志》终审会，会议由厅办公室副主任许灏主持，副厅长李润锁、厅水志办主任李献华及郭青梅、陈恒基、樊维翰等专家与会。评审组专家对志书内容进行了认真细致的审评，认为该志内容丰富，资料详实，编写体例符合规约要求，达到了成志标准，一致同意通过终审；同时对一些具体问题提出了进一步修改完善的意见。

简介：Existingfarfieldexpressionsofsecondorderpotentialsarebynomeanscomplete.Hencetherehasbeennoexactfarfieldexpressionofsecondorderpotentials.InthispaperthefarfieldexpressionforΦd（2）ispurposelyavoidedindeducingtheformulaeofsecondorderforcesandaseriesoffunctionsΦdRnareused.Thefarfieldexpressionofisgiven,whichfor（x,U,z）∈Σ,φdRn（2）φd（2）.Usingthesepropertiesformulaeforcalculatingsecondorderdiffractionforcesareobtained.Tocalculatetheintegral∫∫1/gfΨdsitisdividedintotwoparts.Oneistheintegraloverafinitedomainandthefunctionundertheintegraliscontinuous,sotheusualapproximateintegrationformulaemaybeused.Theotheristheintegraloveraninfinitedomain.Usingthefarfieldexpressionoffirstorderpotentials,formulaeforcalculatingtheintegraltomeetgivenaccuraciesaregiven.Themooringforceinsurgedirectionisusedforcomparisonbetweennumericalpredictionsandexperimentalmeasurements.Thepredictedresultsarecheckedagainstthemeasuredvalueinaspeciallydesignedtest.Inthelowfrequencydomainofinterest,themooringforcesinsurge,forcalculatedandexperimentalspectraareingoodconsistencysolongasthedampingcoefficientsischoosenappropriately.

简介：TheturbulenceflowFreeSurfacehasimportantapplicationsinhydraulicspillwaysstructure,suchasthehydraulicjump,energydissipationflowetc.Thisisbeingconsideredasverycomplicatedflow,andhasnotyetbeensolvedquitewellbynumericalmethod.Inthispaper,aLarge-scalecomputationalsoftwarepackagearedevelopedfornumericallaboratoryofhydraulicspillwaystructure.Somemethods,suchasturbulencemodel,freesurfaceandirregularboundarytreatingtechniques,scientificcomputervisualizationareputforwardandperformed.

简介：Inthispaper,anoveladaptivemeshσcoordinatemodelisproposedforthestudiesofWaveandStructureInteraction(WSI).Themodelisvalidatedbyusingthecaseofasolitarywavemovementinanopenchannelwithconstantwaterdepthandthecaseofnonbreakingsolitarywavepropagatingoverastep.NumericalresultsagreewellwiththeanalyticalsolutionsobtainedbasedontheBoussinesqtheory,thelaboratorydataandothernumericalmodelresults.Theproposedmodelisthenusedtostudyasolitarywaveinteractingwithasuspendedfixedstructure.

简介：本文叙述了奥地利伊布斯—佩森博伊格水电站改造后新的自动控制系统。

简介：9月26日，呼蓄项目首节压力钢管1号引水隧洞I-356／357（7号弯管定位节）成功安装并通过验收。

简介：党的十一届三中全会的胜利召开距今已20年了。20年来，在党的改革开放政策的指引下，在省水利厅党组的正确领导下，陕西院率先在全省水利系统推行技术经济改革，以水利规划、勘测、设计事业为中心，在实现多元化发展方面取得了巨大成绩。经济效益和职工收人有较大提高，工作、生活条件明显得到改善。全院综合实力和对外形象发生了显著变化。陕西院的辉煌发展归根到底得益于党的改革开放政策。