简介：Thebesthydraulicchannelsectionmakesthemaximumflowcapacityforthesameflowcross-area,andtheminimumcross-areaandwettedperimeterforthesamedischarge.Theconstructioncostcanbereducednearlytotheminimumatthesametime.Thehorizontalbottomparabolicsection(HBPsection)isacompositesection.Itisimportantfordesigntofindthebestcombinationformofthehorizontalbottomandtheparabolicsides.Thispaperstudiesthebesthydraulicsectionanditshydrauliccharacteristics.Theexplicitformulaeareproposedtodeterminethedimensionsandthebestcombinationformofthehorizontalbottomandtheparabolicsides.Theseexplicitformulaeandtheparametersmakeiteasytodesignthechannel.Itisshownthattheratiosofthesurfacewidthtothedepthandthebottomwidthtothedepthareconstantforthebesthydraulicsection.Thecomparisonswiththeclassicparabolic,rectangular,trapezoid,triangular,semi-cubicandhorizontal-bottomedsemi-cubicsectionsshowthattheHBPsectionhasthelargestflowcapacityandtheshortestwettedperimeterforthesameflowarea,andhasthesmallestflowareaforthesamedischarge.ItisindicatedthattheparabolicsidepartsofthebesthydraulicHBPsectionaredifferentfromthoseoftheclassicsection.TheresultsofthebesthydraulicsectionoftheclassicparabolicchannelcannotbeapplieddirectlytotheHBCsection.

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

简介：Thispaperpresentsastudyofthemovementandthehydrodynamicperformanceofanewtide-poweredhydraulicturbinethroughnumericalsimulations.Bymeansofthemovingmeshmethod,theopen-closedsequencesofthebladesandthemovementoftherotorsareobtainedandtheangularvelocityandtheaverageenergyutilizationcoefficientunderdifferenttipspeedratiosarealsoobtained.Moreover,theoptimumtipspeedratioisidentifiedbyintegratingtheoutputpowerandtheenergyutilizationcoefficientofthehydraulicturbinewithdifferenttipspeedratios,providingdatasupportfortheprototypedesignofthehydraulicturbine.

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。