简介：Inthispaper,amodifiedκ-εturbulencemodel,asimplifiedalgebraicstressmodelandadevelopedtwo-fluidmodelhavebeenpresentedbasedonnumericalmodelingofturbulentbuoyantrecirculatingflows.Thecalculatedresultsbythesemodelsareingoodagreementwithexperiments.However,thelastmodelismuchbetterforsimulatinggravity-stratifiedflows.

简介：Inthispaperthefiniteelementmethodisusedtosolvethetwo-dimensionalgradi-entcurrentproblem,Thesolutionisobtainedbytwo-stepexplicitmethod.ItisverifiedwithgoodagreementbythefielddataofferedbyXiamenE.P.A.,Fujian,P.R.C.Theauthorsrec-ommendthattheproposedmethodissuitablefortheanalysisandcomputationoflongwavesofepeiricseaattheseawardfirth.

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简介：Inthisarticle,theanaglyphvideomakerisemployedforgeneratingrealistic3-DflowsandthesoftwareFlowAnimatorisdevelopedusingthattechnology.BasedonMicrosoftWindowsPresentationFoundation(WPF),thereal3-Dsceneissetupandmarkerparticlesaredistributedinitrandomlyinordertocreateamorenaturalflowscenario.ThetrajectoryoftheparticlemotioniscalculatedwithLagrangiandescriptionin3-Dspace.Duringthesimulation,theviewportcanbechangedinordertofocusondifferentpartsofthemodelbypanning,zooming,rotatingandinclinationvariationetc.Markerparticlesmayappearindifferentshapes:spheres,tracking-balls,cylindersandribbonsinordertofitdifferentflows.Itisthefirsttimethatthevideoanaglyphtechnologyisemployedinthe3-Dhydrodynamicsimulation,whichremovestheobstaclesfor3-Dscenestoberenderedonaflat-paneldisplay.

简介：A2-DLatticeBoltzmannMethod(LBM)coupledwithaSub-GridStress(SGS)modelisproposedandvalidatedbyflowsaroundanon-submergedspurdikeinachannel.AndthentheLBM-SGSmodelisfurtherappliedtoflowsinapumping-stationforebay.ShallowwaterequationsarenumericallysolvedbytheLBMandtheturbulencecanbetakenintoaccountandmodeledefficientlybytheLargeEddySimulation(LES)model.Thebounce-backschemeofthenon-equilibriumpartofthedistributionfunctionisusedattheinletboundary,thenormalgradientofthedistributionfunctionissetaszeroattheoutletboundaryandthebounce-backschemeisappliedtothesolidwalltoensurenon-slipboundaryconditions.Firstly,themodelsuccessfullypredictstheflowcharacteristicsaroundaspurdike,suchascirculatingflow,velocityandwaterdepthdistributions.TheresultsareverifiedbytheexperimentaldataandcomparedtotheresultsobtainedbyconventionalSmagoringskyModel(SM)ofLES.Finally,theLBM-SGSmodelisusedtofurtherpredicttheflowcharacteristicsinaforebay,suchassecondaryflowandwaterlevel.Thecomparisonsshowthatthemodelschemehasthecapacitytosimulatecomplexflowsinshallowwaterwithreasonableaccuracyandreliability.

简介：BasedonthePreissmannimplicitschemefortheone-dimensionalSaint-Venantequation,themathematicalmodelforone-dimensionalrivernetworksandcanalnetworkswasdevelopedandthekeyissuesonthemodelwereexpatiatedparticularlyinthisarticle.Thismodelappliesthemethodofthree-stepssolutionforchannel-junction-channeltosimulatetherivernetworks,andtheGausseliminationmethodwasusedtocalculatethesparsematrix.Thismodelwasappliedtosimulatethetree-typeirrigationcanalnetworks,complexloopedchannelnetworksandtheLowerColumbiaSloughnetworks.TheresultsofwaterlevelanddischargeagreewiththedatafromtheAdlulandfielddata.Themodelisprovedtoberobustforsimulatingunsteadyflowsinrivernetworkswithvariousdegreesofcomplexstructure.Thecalculatedresultsshowthatthismodelisusefulforengineeringapplicationsincomplicatedrivernetworks.Futureresearchwasrecommendedtofocusonsettingupecologicalnumericalmodelofwaterqualityinrivernetworksandcanalnetworks.

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简介：Adailydistributedhydrologicalmodelwasdevelopedusingroutinehydro-meteorologicaldataonthebasisoftherasterDEMandlandcoverdata.ThenthemodelwasusedtomodeldailyrunoffoftheDatongRiverValleylocatedintheuppercatchmentoftheYellowRiverBasin.Therunoffcomprisessurfaceflow,subsurfaceflowandgroundwaterflow.Evapotranspirationcomprisescanopyevaporation,snowsublimationandsoilevapotranspiration.TheinfiltrationtothesoilwasestimatedwithimprovedGreen-Amptmodel,andthepotentialevapotranspirationisestimatedwithMortonCRAEmethod,whichonlyneedstheroutinemeteorologicaldata.Simulationresultsandthecomparisonwithsemi-distributedSLURPhydrologicalmodelshowthatthestructureofthemodelpresentedhereinisreasonable.

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简介：Amongexistingremotesensingapplications,land-basedX-bandradarisaneffectivetechniquetomonitorthewavefields,andspatialwaveinformationcouldbeobtainedfromtheradarimages.Two-dimensionalFourierTransform(2-DFT)isthecommonalgorithmtoderivethespectraofradarimages.However,thewavefieldinthenearshoreareaishighlynon-homogeneousduetowaverefraction,shoaling,andothercoastalmechanisms.Whenappliedinnearshoreradarimages,2-DFTwouldleadtoambiguityofwavecharacteristicsinwavenumberdomain.Inthisarticle,weintroducetwo-dimensionalWaveletTransform(2-DWT)tocapturethenon-homogeneityofwavefieldsfromnearshoreradarimages.Theresultsshowthatwavenumberspectraby2-DWTatsixparallelspacelocationsinthegivenimageclearlypresenttheshoalingofnearshorewaves.Wavenumberofthepeakwaveenergyisincreasingalongtheinshoredirection,anddominantdirectionofthespectrachangesfromSouthSouthWest(SSW)toWestSouthWest(WSW).Toverifytheresultsof2-DWT,waveshoalinginradarimagesiscalculatedbasedondispersionrelation.Thetheoreticalcalculationresultsagreewiththeresultsof2-DWTonthewhole.Theencouragingperformanceof2-DWTindicatesitsstrongcapabilityofrevealingthenon-homogeneityofwavefieldsinnearshoreX-bandradarimages.

简介：Thepapermainlyfocusesondescribingthemodificationmadetoanewdepth-averagedtwo-equationturbulentclosuremodelbasedontherevisedκ-ωmodelrecently.Inthecaseofsidedischargedjetswithtempera-turedifferenceandtransversecurrent,thenewmodelhasbeeninvestigatednumericallyindetail.Asapracticalexampleofapplicationtousethenewmodel,thesidedischargeofthecoolingwaterfromthreeoutletsintoanatu-ralriverononebankhasbeensimulated,andthegeomorphicvariationunderwaterhasbeentreatedsuitably.Twodepth-averagedmodels,andhavebeenused,thelaterwastheuniqueoneuptothepresent.Emphasisisplacedonthecomparativeresearchwithdifferentmodelsunderthesamecomputationalconditions.Ithasbeenverifiedthatifthedischargedflowratesarerelativelysmall,whenthepollutantplumeinthenearandtransitionalzonsispredicted,theagreementwithexperimentalandfielddatasimulatedbythemodelisbetterthanbythemodelorothermethodscommonlyusedinengineering.

简介：河南省水产科学研究所小浪底水库网箱养鱼科研基地于2002年度对本所研制生产的空气动力管道式网箱自动投饵机(专利号ZL00264992．6)进行生产应用。试验网箱共16个，其中主养鲤鱼箱10个、草鱼箱2个、武昌鱼箱2个、鲫鱼箱1个、日本锦鲤箱1个。手工投喂对比试验网箱10个，其中主养鲤鱼箱4个、草鱼箱2个、武昌鱼箱2个、鲫鱼箱1个、日本锦鲤箱1个。2003年度进行了重复和补充试验，内容有：1．开食驯化上浮集中摄食成功时间对比试验；

简介：人工湿地作为一种新型的生活污水处理系统,经过国内外多年研究和实践,该技术已经较为成熟,对解决我国农村污水排放问题和改善农村水环境污染现状有着积极的意义。当前正值全国建设美丽乡村、河北省开展村容村貌提升的关键时期,人工湿地污水处理技术的推广意义深远且具有极其广阔的应用前景。邢台市桥东区三合庄村人工湿地污水处理工程创全市首例,2013年正式运行。

简介：陕西院地勘总队从去年开始在黑河、甘峪、宁强等水利工程的帷幕灌菜施工中推应用了孔口封闭灌浆法，并自行设计加工了灌浆孔口封闭器。通过一年多来的生产应用证明，这种方法很好，已取得了明显的技术经济效果，

简介：在石方爆破工程中，单一的使用水胶炸药，成本高，爆破效果不怎么明显。如果将水胶炸药和铵油炸药混合使用，不但效果明显，而且大大节约成本。

简介：湿地是介于水、陆两种生态系统界面的特殊生态系统，被誉为“地球之肾”、“物种的基因库”、“地球上生物多样性最丰富的生态系统”等。它利用系统中物理、化学、生物的三重协调作用，通过过滤、吸附、沉淀、植物吸收、微生物降解来实现对污染物质的分解与净化。目前已经有很多有关人工湿地应用方面的报道，但是人工湿地的净污效果受多方面因素的影响，并不一定能够按照人们的要求净化污水，或者说净化效果不太理想。这些因素主要包括湿地的水力条件、湿地的类型、湿地植物、温度、湿地的宽度和面积、pH值和氧化还原电位（Eh）、湿地基质及微生物等。

简介：大坝基础经固结灌浆处理后岩体的变形模量会有相当程度的提高,其值通常采用孔壁变模仪进行测试,并通过孔壁声波波速进行验证,但其测试值受到地质条件、裂隙发育、孔壁质量、测试方法等因素的影响,与岩体真实变模值存在一定的误差.本文从测试方法、灌浆过程等方面分析了某工程钻孔变模测试值偏低的原因,通过类比推证了在陡倾裂隙发育地层对穿声波波速和平板载荷模量相关性较好,更能反映地层岩体的整体变形模量,分析论证了在大规模灌浆处理后岩体的变模值将比灌浆试验时有相当程度的提高.

简介：双龙湖是重庆市内一座城市景观内湖，2002年监测双龙湖属Ⅴ类水体，水质严重恶化。2003年对双龙湖水环境进行了治理，采取生态措施、工程措施与管理措施相结合的综合治理方案。水体水质发生了很大变化，为科学评估双龙湖综合治理效果。引入模糊数学概念，应用模糊综合评判方法来客观地反映水环境质量状况。结果表明：双龙湖水体在治理前属Ⅴ类水质，隶属度达到90％，主要污染物为磷；治理后水体水质优于Ⅳ类标准，Ⅳ类及以上隶属度达到97％，年季水质动态稳定在Ⅲ类和Ⅳ类之间，敏感性因子为氮和磷。应用模糊数学方法，通过计算分析污染因子隶属度、权重系数和模糊综合指数来评价水体水质具有科学性和实用性。

简介：1概述粉喷法加固软弱地基,国内80年代初开始应用,该技术以其加固软弱地基效果好、节约资金等独特的优越性,发展速度很快。目前实际工程中使用该法加固软弱地基时,水泥粉喷法较多,石灰粉喷法较少。石灰粉体喷射搅拌法是以生石灰粉为固化剂,通过专用的粉体喷射搅拌施工机械,用压缩空气将粉体加固料以雾状喷入地基土中,凭借钻头叶片的旋转,使粉体加固料与原位软土搅拌,并得到充分混合,由固化剂和软土间的水份发生

简介：百泉泉域是一个相对封闭的水文系统且补水面积较小,受气候和人为因素影响较大,水环境也更容易受破坏。从历史上来看,1980年前泉水平均流量6.87m3/s,丰水年达9.80m3/s。1980年以后,随着区域内矿产开挖的加剧和一批重点企业建成投产以及朱庄水库下闸蓄水,使百泉泉域内水位持续下降,至2011年7月百泉水水位埋深接近80m。按照邢台市水生态保护与修复指挥部的安排．2013年3月29日～7月7日和2014年4月18日～7月1日分别进行了水库渊水补充岩溶水工作，两年累计补水1．02亿m3。