简介:Flushingpipeoutletsareprovidedatthefloorofsedimentationbasinsforflushingoutofthedepositedsediments.Theseoutletshavetobepositionedinsuchawaysoastoremovethedepositedsedimentseffectively.Intheabsenceofrationalmethodforthelocation,presentlytheoutletsarelocatedbyjudgment.Areviewofliteratureindicatedthatthereisnojudiciousmethodavailableforobtainingtheoutletdiameter.Presentedhereinarethedesignequationsfortheflushingoutlets.Itishopedthattheequationwillbeusefultothedesignengineers.
简介:Theresultsofmathematicalmodellingofunsteadyflowconditionscoupledwithspecificsedimenttransportrelationsarepresentedhere.SimultaneoussolutionsofthedeSaintVenantequationswiththreedifferenttransportrelations,namelytheEngelund-Hansenequation,Grafequation,andanempiricalequationarepresented.TheresultsobtainedwerecomparedwiththosefromtheFluvial-12programunderthesameinputconditionsandreasonablecorrelationwasobserved.Theadvantagesofthecoupledmethodforsimultaneoussolutionoftheequationscompriseahigherdegreeofaccuracy,thepossibilityofintroductionofanydesiredtransportequationintothemodelandthepossibilityofintroducinganyboundaryconditionsintothemodelalongsideacompleteunsteadyflowmodelling.
简介:Researchonin-channelsandminingisimperativeasitmayhaveasignificantimpactonchannelmorphology.Followingthisquesttoquantitativelycomprehendthephenomenon,experimentalstudiesweredonetoinvestigatethedynamiccharacteristicsofthemigrationofaminingpit.Theevaluationofthemigrationrateofaminingpitinaphysicalscalemodelhasfoundariseinthemigrationrateofthepit'supstreamedgewithincreasingdischarge.Awaveletanalysisappliedforanalyzingscale-dependentmigrationofthebedprofileofaminingpitalsorevealedsimilarfindings.Additionally,thewaveletanalysisexaminedthelength-scaledependentmigrationofaminingpitandadecreaseinthemigrationratehasbeenobservedwithanincreaseinthelengthscale.Theplanformofapit(length-to-widthratio)governstheerosionanddepositionprocessesaroundthepit.Bothphysicalandstatisticalapproachesshowanincreaseinthemigrationratewithanincreaseinthelength-to-widthratioofthepit.Anempiricalformulationhasbeendevelopedforcalculatingthemigrationrateoftheupstreamedgeofaminingpitbasedonpitgeometry(length-to-widthratio),averageflowvelocity,andcriticalshearstressofthebedmaterial.Theresultsalsoshowahigherbedloadtransportrateinthechannelsubjectedtominingascomparedtoaplainbedchannel.
简介:RillerosionisadominantprocessofmorphologicalevolutionoftheLoessPlateauinChina,anddeliveriesmuchloesssedimenttorivers.Datafromtwoflumeexperimentsconductedonthebareandglass-coveredbedsindicatedthatthefillflowdevelopsintoaseriesofrollingwaves.Theshearstressontherillbeddistributesunevenlybothspatiallyandtemporally.Anewmethodbasedontheenergyconservationlawisproposedinthisstudy.Thustherelationshipbetweentherunoffenergyconsumptionfromtheinteractionofwaterflowandslopebedandsoildetachmentisformulated.Theresultsshowedthatthedataforthesoildetachmentrateonslope(Dr)andtheenergyconsumptionofrunoff(E1)fittedwellwithnewly-developedfunction.Therillerosionoccurswhentherunoffenergyconsumptionexceedsacriticalvalue.
简介:在沉积运输的调查,区分休息(AoR)的角度的各种各样的定义是必要的在文学可得到。静态的AoR,斜坡的上面、更低的角度镇静,就在斜坡不稳定性前后的形式,当当沉积谷物连续地是动人的时,动态AoR能被观察时,击倒一个斜面。在现在的学习,一系列实验室实验被进行与0.28-4.38的中部的直径为一致自然沉积测量休息的静态、动态的角度?公里。结果证明不同斜坡角度有不同特征。上面、动态的AoR稍微与增加谷物直径增加,当更低的AoR不对在沉积的变化敏感时,缩放并且可以假定经常的价值。上面、更低的AoR的一般水准等价于动态AoR,并且他们之间的差别与增加谷物直径增加。当在运输,沙丘移植和本地人搜索的水流带来的碎石的调查使用开发时,现在的学习建议休息的不同角度应该小心地被对待。
简介:沉积氧需求(草皮)是为水质量分析并且为在河,湖,河口和海湾里当模特儿的水质量的一个关键参数。草皮能在实验室并且在situ被测量。然而,在里面situ技术看起来是为测量草皮,,的更好的途径它可能提供更代表性、精确的结果。以便优化设计在situ草皮测量房间,在圆柱的草皮测量房间的三维的流动地,通常使用为在situ大小,被使用基于RNG的k-数字地模仿了两倍方程骚乱模型。有三种不同流入管子配置的草皮房间被调查。结果证明那房间III在另外的图案上介绍明显的优点为在situ草皮测量,因为好流动混合能被完成,底部沉积暂停能在房间被避免。数字模拟结果被比较验证,存在结果源于实验室实验。设计反映数字模拟的结果的草皮测量房间成功地被测试为在新鲜、盐的水里的situ草皮大小。
简介:Itisacommonpracticetouseahydrologicalcontinuityequationasthegoverningequationindetentionponddesign.Althoughthedetentionvolumecanbeevaluatedusinganumericalmethodandcomputerprogram,theyarenotavailableforengineerstousebecauseofthedifficultyinvolvedinthenumericalevaluationorthecomputerprogrammaynotbereadyforengineers.Thisstudyintendstoprovideaformulaforcalculatingthevolumeofadetentionpond.Anonlinearcontinuityequationfordetentionponddesignisobtainedbyapplyingatriangular/trapezoidalinflowhydrographandspillwayororificefortheoutflowdevice.Thisperturbationmethodisemployedtoresolvetheequation.Afterdiscussingtheomissionandcurvefittingmethods,aformulafordetentionponddesignisproposed.Severalexamplesaredisplayedandahighagreementwiththenumericalresultisobtained.
简介:本文提出了一种将高分辨率阵列侧向和方位电极系综合在一起的三维侧向测井电极系3D-LS,该电极系具有径向、纵向和周向探测能力。通过有限元数值模拟计算,考察了井眼尺寸、冲洗带电阻率、侵入深度、层厚及围岩电阻率对六种不同探测模式的影响,确定了电极系尺寸和探测特性。分析伪几何因子,低侵时电极系的探测深度最深可达1.5m,其值接近斯伦贝谢双侧向电极系深探测深度,而大于高分辨率方位侧向成像仪深探测深度,并且三维侧向测井电极系可提供多条径向不同深度曲线,可更好地描述地层侵入剖面。无限厚地层条件下,方位电极可识别出厚度0.1m的异常体,利用方位侧向曲线半幅点对应异常体厚度判断,对异常体纵向分层能力可达0.5m。高阻背景下,异常体的电阻率越低,越靠近井眼,方位越大于15度,越易被方位电极探测。数值模拟结果为后续三维侧向测井电极系的研究奠定了基础,对低阻异常评价具有一定的指导意义。
简介:大型、构造复杂的三维物理模型可用于模拟油气勘探。构造逼近实际地质状况的模拟具有制作技术难度大、质量控制严格等特点,可用于采集宽方位、多方位和全方位的地震数据,从而进行多种三维处理、解释方法验证。本文针对中国西部前陆盆地地表条件复杂地下构造复杂,导致成像不理想等问题,基于复杂的地下构造,设计制作了目前世界上模拟施工面积最大、构造最复杂的KS(塔里木盆地克深勘探工区)物理模型。本文的模型技术的进步主要涉及3个方面:模型的设计方法、模型的浇铸流程和数据采集,首次给出了物理模型的三维真实速度模型,定量分析了物理模型的制作精度,绝对误差小于3mm,可以满足方法试验的需要。该模型基于三维形态测量技术建立了三维真实速度模型,可作为方法试验的基础数据。因此,该模型可作为地震物理模拟技术的标准。