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简介：AmovablebedphysicalmodelwasconstructedtoinvestigatehydraulicdesiltationbyflushingandlateralerosionintheTapureservoir,Taiwan.Themodelscalingisbasedontherequirementfordynamicsimilarityofcohesivesedimentdepositinitiationinflushingprocesses.Formodelscaling,flumeexperimentsinvestigatingtheinitiationofcohesivesedimentdepositswerecarriedouttoestablishtherelationshipbetweencriticalshearstressoftheflowanddrydensityofthedeposit.Experimentsinthephysicalmodelwerethenperformedtomeasurethevariationsofthereservoirwaterlevel,theoutletdischargeandtheoutflowsedimentdischarge.Theprocessesofemptyingandflushingwereobservedandanalyzedinthemainflushingchannel.Oneoftheexperimentswasconductedtosimulatetheon-siteflushingoperationsonJune11,1997.Theresultsshowedthatthetotalcumulativeflushedsedimentvolumebyphysicalmodelingwasclosetothatbynumericalsimulation.Todealwiththefloodplaindeposits,experimentsoflateralerosionasanauxiliarymethodwerealsoconductedinthephysicalmodeltoinvestigatetheeffectivenessandapplicabilityfortheTapureservoir.

简介：Intherillerosionprocess,run-onwaterandsedimentfromupslopeareas,andrillflowhydraulicparametershavesignificanteffectsonsedimentdetachmentandtransport.However,thereisalackofdatatoquantifytheeffectsofrun-onwaterandsedimentandrillflowhydraulicparametersonrillerosionprocessatsteephillslopes,especiallyintheLoessPlateauofChina.Adual-boxsystem,consistingofa2-m-longfeederboxanda5-m-longtestboxwith26.8%slopegradientwasusedtoquantifytheeffectsofupsloperunoffandsediment,andofrillflowhydraulicparametersontherillerosionprocess.Theresultsshowedthatdetachment-transportwasdominatedinrillerosionprocesses;upsloperunoffalwayscausedthenetrilldetachmentatthedownsloperillflowchannel,andthenetrilldetachmentcausedbyupsloperunoffincreasedwithadecreaseofrunoffsedimentconcentrationfromthefeederboxoranincreaseofrainfallintensity.Upsloperunoffdischargingintotherillflowchanneloranincreaseofrainfallintensitycausedtherillflowtoshiftfromastratumflowintoaturbulentflow.Upsloperunoffhadanimportanteffectonrillflowhydraulicparameters,suchasrillflowvelocity,hydraulicradius,Reynoldsnumber,FroudenumberandtheDarcy-Weisbachresistancecoefficient.Thenetrilldetachmentcausedbyupsloperunoffincreasedastherelativeincrementsofrillflowvelocity,ReynoldsnumberandFroudenumbercausedbyupsloperunoffincreased.Incontrast,thenetrilldetachmentdecreasedwithanincreaseoftherelativedecrementoftheDarcy-Weisbachresistancecoefficientcausedbyupsloperunoff.Thesefindingswillhelptoimprovetheunderstandingoftheeffectsofrun-onwaterandsedimentontheerosionprocessandtofindcontrolstrategiestominimizetheimpactofrun-onwater.

简介：Quartercircularbreakwater(QCB)isanew-typebreakwaterdevelopedfromsemi-circularbreakwater(SCB).ThesuperstructureofQCBiscomposedofaquartercircularfrontwall,ahorizontalbaseslabandaverticalrearwall.ThewidthofQCB'sbaseslabisabouthalfthatofSCB,whichmakesQCBsuitabletobeusedonrelativelyfirmsoilfoundation.ThenumericalwaveflumebasedontheReynoldsaveragedNavier-StokesequationsforimpressibleviscosityfluidisadoptedinthispapertosimulatethehydraulicperformancesofQCB.SincethegeometryofbothbreakwatersissimilarandSCBhasbeenstudiedindepth,thehydraulicperformancesofQCBaregivenincomparisonwiththoseofSCB.

简介：Travelingandstationaryinternalhydraulicjumpsindensitycurrentswithpositiveornegativeentrainmentcoefficientswereanalyzedbasedonsimpleassumptions.Anexpressionofinternalhydraulicjumpswithentrainmentcoefficientswasderived.Experimentaldata,publishedinliterature,ofstationaryinternalhydraulicjumpsinturbid,thermalandsalinedensitycurrentsincludingmeasuredvaluesofwaterentrainmentwereusedtocomparewiththeory.Comparisonwasalsomadeoftravelinginternalhydraulicjumpsbetweenmeasureddataandtheory.

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简介：Thefrontpartoftheflowisveryimportantandcomplexinthecaseofdebrisflowwherethereisanaccumulationoflargeboulders.Itisimportanttocontrolordampentheenergyofthefrontalpartofadebrisflowforthesafetyofthedownstreamareabecausetheimpactpressureofdebrisflowismuchgreaterthanthatofclearfluid.Themainobjectiveofthisstudyistoanalyzethehydrauliccharacteristicsoftheproposeddam(i.e.closed-typedamwithflap).Theverticalpressuredistributionofthistypeiscomparedwithconventionaldamtypes.Intheexperiments,thetotalpressureassociatedwithmajordebrisflowswasrecordedinrealtimebyasystemconsistingoffourdynamicpressuresensorsinstalledondifferenttypesofdam.Theresultsfromexperimentaldataclearlyshowthatthedamwiththeflaphasadvantagesofcapturingthedebrisflowwithlargebouldersandcontrolsthetotalpressurebyflowcirculationduetopresenceoftheflapstructurecomparedtoaclosed-typedamwithoutflap.Furthermore,theempiricalcoefficientsofhydrodynamicandsolidcollisionmodelswereproposedandcomparedwithavailablecoefficients.

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简介：为切入的流的隧道可变性的水力的几何学上的盆水文学的效果为Yazoo河盆用可得到的领域数据集合和分水岭水文学和隧道hydraulics的模型被调查，美国。学习用简单线性回归作为排水区域的功能在满满的分泌物介绍满满的分泌物，隧道宽度，吝啬的深度，代表性的区域，纵的斜坡，单位溪流力量，和吝啬的速度的水力的几何学关系。水力的几何学关系为61条溪流被开发，当隧道进化模型(CEM)打IV和V，他们中的41个是CEM溪流类型II和III，他们中的20个被分类。这些关系对无价水力并且水资源工程师，水文学者，和geomorphologists在溪流恢复和保护包含了。这些关系能被用来在一条溪流隧道的比较稳定性的未计量的分水岭以及评价在满满的舞台和溪流尺寸的地鉴定帮助。一套水力的几何学关系在这研究被介绍，这些实验关系为稳定、切入的隧道描述物理关联。代表性的区域，联合隧道宽度和吝啬的隧道深度的效果，被发现对在排水区域和满满的分泌物的变化高度应答。与在排水区域和满满的分泌物的变化一起的代表性的区域，隧道宽度，吝啬的隧道深度，和吝啬的速度的分析比是吝啬的隧道深度或吝啬的速度的显示隧道宽度对在排水区域和满满的分泌物的变化更应答。

简介：在为低温度、浅、高的冰点油水库折断处理期间，首要的问题是由注射冷液体克服uncompleted故障，折断液体的uncompletedcleanup和形成的冷损坏。避免那些问题，采用被建议一新包含了在这篇论文描述了的产生热的水力的断裂液体系统。第一，二种化学产生热的系统我们再学习，NH_4Cl-NaNO_2系统被选择。根据系统的反应特征，草酸酸被选择为反应的催化剂并且包含由阶段分离方法把乙醇纤维素和石蜡用作涂层材料。有折断液体的hydroxypropyl-guar的NH_4Cl-NaNO_2-encapsulated草酸酸的相容性也在论文被讨论。结果证明包含的水力的断裂液体包含了heat-generatingagents兔好稳定性和相容性。当断裂的液体包含2.0摩尔·L~时(-1)NH_4Cl-NaNO_2,0.93%每硫酸盐包含了草酸酸和0.08%铵，山峰温度罐头到达78.0℃和剩余液体的粘性是在4个小时以后的3.12mPa·s。

简介：Thepaperdescribesapermeametertestmethodfordeterminationofthehydraulicconductivity(AT)alongmulti-directionsinfluvialsedimentswithcrossbeddings.Unlikeexistingin-situpermeametermethodsthatdeterminehydraulicconductivityforsubmergedstreambeds,ourmethodwasintendedtomeasurehydraulicconductivityofexposedstreambedsorfluvialsediments.ThemethodwasappliedtotheWeiRiver,ShaanxiProvince,CentralChinaforcharacterizationoftheanisotropyofKinawell-sortedfluvialsediment.Theresultsillustratedthateveninwell-sortedsediments,cross-beddingandsedimentfabrication(ortexture)canleadtovariedKvaluesalongdifferentmeasurementdirections.TheKvaluewasthelargestalongthedipdirection(orthemajordirection)thatisparalleltotheorientationofcrossbeddingandthesmallestinthedirectionperpendiculartothebedding(ortheminordirection).TheKvalueinagivendirectionbetweenthemajorandminordirectionoftenfellintherangeboundedbytheKvaluesinthemajorandminordirections.TheanisotropyratioofK(theratioofKvaluebetweenthemajorandminordirections)intwotrenchesforthiswell-sortedfluvialsedimentwasupto1.14to1.23,respectively.Ourresultsalsodemonstratedthatevenforwell-sortedsediments,theKvaluesbetweentwosamplingpointsonlyabout10cmapartcandiffer.ItisclearthattheKdistributionstronglycorrelatestothebeddingorientation.

简介：Inthispaper,ahorizontal2-Dnumericalmodelhasbeendevelopedtosimulateflowprocessesindikeburst.Thefinitedifferencemethodisusedincomputation.Themodelemploys2-Dflowequationsandcansimulatecomplexflowswhensupercriticalflowandsub-criticalflowexistsimultaneouslysuchashydraulicjumps.Severalsimulatedresultsareworkedouttodemonstratetheapplicabilityofthenumericalmodel,suchasfloodpropagationonadrybedofacomplexterrain.

简介：关于土壤parameterisation的无常的高度限制分布式的洪水控制措施的身体上基于的模拟的意义，它影响流量产生进程，例如陆地使用变化或不同土壤耕种惯例。在这研究，从在Scheyern研究农场的hillslope规模的土壤测量数据与相比表明这无常。到为在Scheyern的调查区域的土壤的空间可变性的报道，不同途径被使用估计土壤水力的性质和浸透的水力的电导率，并且与领域大小相比。

简介：这份报纸描述系统与一只反的摆钟在波浪精力变换器(WEC)采用了的双击的代理水力的力量起飞(PTO)。水力的PTO把慢不规则的互给波浪运动变换成一个电的发电机的相对光滑的、快旋转。水力的PTO系统和它的控制的设计是批评的最大化产生力量。时间领域模拟研究和照原尺寸的沙滩测试的实验室实验被介绍。包括他们的比较在的模拟和实验室实验的结果照原尺寸也被介绍，它与双击的代理水力的PTO系统与一只反的摆钟验证了设计的合理性和WEC的原型的一些关键部件的可靠性。

简介：-Thispapercarriesouttheanalysisofmechanicsofagripsystemofthree-key-boardhydraulictongsdevelopedforoffshoreoilpipelineswhichhasbeensuccessfullyusedinoilfieldsinChina.Themainimprovementofthissystemisthataleverframestructureisusedinthestructuraldesign,whichreducesgreatlythestressesofthemajorcomponentsoftheoilpipetongs.Theoreticalanalysisandnumericalcalcu-lationbasedonthirteenbasicequationsdevelopedshowthattheteethboardofthetongsisnoteasytoslipasfrequentlyhappenstoothersystemsandisofhigherreliability.

简介：为有在出现在所有团中的控制输入隧道和参数无常的时间延期的电镀物品水力的激活的结构的系统的一个类的柔韧的活跃颤动控制的问题，抑制并且僵硬矩阵在这份报纸被调查。由介绍一个线性变化参数，首先，非线性的系统被描述为变化的一个线性参数(LPV)模型。基于这个LPV模型，第二，为asymptotically要稳定的系统的一个基于LMI的条件被推出。由解决这些LMI，一个参数依赖者控制器为与骚乱变细的规定水平稳定的closedloop系统被建立。条件也被扩大到不明确的案例。最后，一些数字模拟表明建议控制器的令人满意的表演。

简介：摘 要：以咸宁市扩建给水管网系统为例，运用EPANET建立水力模型，模拟城市供水管网的现状运行工况，并对需要新建的管道管径及管材进行优化选择，从管道流量、管道流速和水头损失三个指标的比较来体现运用EPANET水力模型设计的管道设计方案相较于现状管道方案的安全可靠性和经济性，从而验证建立城市给水管网EPANET水力模型优化管道设计方案的可行性。