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简介：Inthispaper,perturbationmethodandFourier-cosine-expansionmethodareusedtosolvea3-DnonlinearproblemofasupercavitatingflowinaninclinedfieldofgravityatlargeFroudenumbers.Byexpandingthevelocitypotentialintoapowerseriesofasmallparameter,theoriginal3-Dnonlinearproblemisreducedtoanumberof2-Dones.Thesolutionsofthefirstthreeordersarederivedindetailandexpressedintermsofthecompleteellipticintegralsofthefirstandsecondkinds.Thentheboundaryintegralequationmethodisappliedtogetthenumericalsolutionsforeachorder.Computationalresultsareprovidedforsupercavitatingflowspastconesundervariousflowconditions.

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简介：Ageneralizedbendflowmodel,treatinga90°singlebendand60°continuousbends,wasdesignedtoquantitativelydescribe3-Dturbulencemechanismofcirculatingnot-fully-developedflowinopenchannelswithbends.The3-Dfluctuatingvelocitiesofturbulentflowweremeasuredandanalyzedwitha3-Dacoustic-Dopplervelocimeter.Formulafor3-Dturbulentintensitywasderivedusingthedimensionanalysisapproach.Expressionsofverticalturbulent-intensitydistributionswereobtainedwiththemultivariant-regressiontheory,whichagreewithexperimentdata.Distributionsofturbulentintensityandturbulentstresswerecharacterized,andtheirrelationshipswereconcluded.Inthebend-turbulent-flowcoreregion,longitudinalandlateralturbulent-intensitydistributionsarecoincidentwithlineardistribution,butinnear-wallregionarecoincidentwiththeGammadistribution.VerticalturbulentintensitydistributionsarecoincidentwiththeRayleighdistribution.Herein,itisconcludedthatthebendturbulenceisanisotropic.

简介：Three-dimensionalseepageindoublefracturedmediawasmodeledinthispaper.Thedeterminationofhydraulicconductivitytensorofrockmassisavitalproblemfortheseawaterintrusionorseawaterencroachmentandseepageoffissuredmedium.Accordingtothegeologicalandhydrogeologicalconditionsforthe2nd-stageconstructionoftheThreeGorgesProject(TGP),thephysicalandmathematicalmodelsforthegroundwatermovementthroughthe3Ddoublefracturedmediaofrockmassduringconstructionwereestablishedinthispaper.Basedondiscontinuity-controlinversetheory,somerelatedparametersofdoublefracturedmediawereinversedwithfluxbeingtheknownquantityandcalibrationofwatertabletheobjectivefunction.Synchronously,theseepagefieldoftheconstructionregionwassystematicallyanalyzedandsimulated,theresultsofwhichexhibitthatthedoublefracturedmediamodeloffracturewatercancomprehensivelyandcorrectlydescribethegeologicalandhydrogeologicalconditionsintheconstructionregion.

简介：桃花坞水库是固始县唯一一座大型蓄水库，由于城区居民生活污水和化肥厂排污污染，使水库水质急剧恶化，水体呈浓稠状，散发着难闻的气味，渔业养殖及其生态环境受到严重破坏。

简介：Thispaperisconcernedwiththewavesgeneratedbya3-Dbodyadvancingbeneaththefreesurfacewithconstantspeedinatwo-layerfluidoffinitedepth.ByapplyingGreen'stheorem,alayeredintegralequationsystembasedontheRankinesourcefortheperturbedvelocitypotentialgeneratedbythemovingbodywasderivedwiththepotentialflowtheory.Afour-nodeisoparametricelementmethodwasusedtotreatwiththesolutionofthelayeredintegralequationsystem.Thesurfaceandinterfacewavesgeneratedbyamovingballwerecalculatednumerically.Theresultswerecomparedwiththeanalyticalresultsforamovingsourcewithconstantvelocity.

简介：本文结合水利规划工作，对应用新型数据处理软件LotusI-2-3在水文水利计算数据处理方面进行一点探索。

简介：Twonear-fieldmethods,namelytheintegralmethodanddifferentialmethod,werepresentedforgivingsecond-ordermeandriftforcesandmomentsbetweentwofixedsubmergedbodiesinregularwaves.Fortheintegralmethod,withaseriesofmathematicalmanipulations,second-orderdriftforcesandmomentscouldbeeasilyexpressedbydistributedsourceswhichcouldbecalculatedbysourcedistributiontechniqueswiththeassumptionthattheamplitudeofshipmotionsaresmallonthebasisofthelinear3Dfrequencytheory.Forthedifferentialmethod,driftforcesandmomentscouldbeexpressedbythederivativeofvelocitypotentialwithrespecttospacecoordinate.Becausetwobodieswouldbehaveasasinglebodywhiletheclearanceisverylarge,thenumericalresultsofonesphereinsuchcaseweregivenandcomparedwithanalyticalresultsofasinglespherewhichdoesnotinvolvetheeffectoffreesurface.Whensubmergeddepthbecomesenoughlarge,agoodagreementcanbereached.Thentheintegralmethodwasusedtopredictthesecond-orderdriftforcesandmomentsoftwosubmergedspheresandspheroidswithasmalllateralseparationdistanceinwavescomparedwiththenumericalresultsobtainedbythedifferentialmethodandtheyagreewell.Bycomparison,itindicatestheinteractioneffectsbetweentwosubmergedbodieshaveaprofoundinfluenceonthedriftforcesandmoments.Inthispaper,theforwardspeedeffectonsubmergedsphereswasalsoconsidered.

简介：天生桥一级水电站C3标合同,是唯一应用FIDIC合同条款,进行国际公开性竞争招投标的土建工程项目。合同包括混凝土面板堆石坝(坝高178m,坝顶长1168m,总填筑量1800万m3)、开敞式溢洪道(总长1808m,底宽120m,开挖总量2060万m3),以及施工导流、砂石混凝土系统临时设施。由于该标工程规模大,技术条件复杂,加上授标及合同签约推迟的影响,增加了合同管理难度。由中国人民武装警察部队水电第一总队、巴西M·J公司组成的联营体———南水公司中标后,认真履行合同责任,精心组织,精心施工,确保按原标书要求实现了1998年8月蓄水,1998年底首台机发电的总目标。该电站C3标合同管理和实施是成功的

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简介：天生桥一级水电站C3标工程原型观测的范围,包括大坝堆石坝体、混凝土面板、溢洪道、导流洞堵头、坝基及相邻边坡等主要工程部位。观测项目为内部变形、外部变形、枢纽永久监测网、水库诱发地震及库区气象等监测系统,具有土石坝、混凝土建筑物及边坡岩土工程综合监测的性质。各监测系统共设有各种仪器监测点1136个,采用了进口和国产的电测式、机械和光学式几大种类的仪器,使用各类仪器传感器23种。为实现大坝观测自动化,后期设计配置了自动化数据采集与终端处理系统。文中对各监测系统监测点设置、仪器埋设与安装等作了简要介绍

简介：该文通过对渭河断陷盆地中一些水库工程勘察，所获得的丰富的资料，总结出该盆地于Q3-Q4时期沉积了一套貌似黄土而其性质不同的土层。在上述地区建库需注意其特有的工程地质性质和在勘察评价中应注意的若干问题。

简介：红枫发电总厂大事记（１９５８年６月３日～１９９５年１２月３１日）凸１９５８年６月３日，中共贵州省委（以下简称省委）决定成立“猫跳河水电工程委员会”．凸１９５８年８月１５日，一级红枫水电站工程正式开工，３０００多人参加开工典礼，省委常委、副省长徐健生为...

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