学科分类
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6 个结果
  • 简介:Physicalpropertiesofseawater,suchassalinity,temperature,densityandacousticvelocity,couldbedemarcatedthroughdegradationofenergycausedbywaterabsorption,attenuationandotherfactors.Toovercomethechallengingdifficultiesinthequickmonitoringofthesephysicalproperties,wehaveexploredthehighresolutionmarineseismicsurveytoinstantlycharacterizethem.Basedontheuniquewavefieldpropagatingintheseawater,wehavedevelopedanewapproachtosuppressthenoisecausedbytheshallowseawaterdisturbanceandobtainusefulinformationforestimatingtheseawaterstructure.Thisapproachimprovesseismicdatawithhighsignal-to-noiseratioandresolution.Theseismicreflectionimagingcanmaptheseawaterstructureacoustically.Combinedwiththeknowledgeoflocalwaterbodystructureprofileoveryears,theinstantmodelforpredictingtheseawaterpropertiescouldbebuiltusingtheseismicdataacquiredfromthespeciallydesignedhighprecisionmarineseismicacquisition.Thismodelcanalsobeupdatedwithinstantobservationandthecompletedataprocessingsystem.Thepresentstudyhasthepotentialvaluetomanyapplications,suchas3Dseawatermonitoring,engineeringevaluation,geologicaldisasterassessmentandenvironmentalassessment.

  • 标签: 数据处理系统 地震勘测 海洋学 水体 地震数据采集 海水结构
  • 简介:-Onthebasisofthephysicalmechanism,abody-fittedcoordinatesystemisdeveloped.Byusingthissystemtheboundariesinsimulationandinrealarefittedwell,andsimulationwithgreataccuracyisachieved.Acomputationexampleindicatesthatcomparedtotraditionaltwo-dimensionalcomputationmethods,thebody-fittedsimulationhasanadvantangeofbettercoincidencewiththerealandcanbeadoptedinsimulatingflowfieldsintidalestuaries.

  • 标签: TIDAL ESTUARY FLOW FIELD body-fitted NUMERICAL
  • 简介:StandardmetabolicratesofSchlegelsblackrockfishwithdifferentbodyweightsaredeterminedinlaboratorybyusingtheflow-throughrespirometerat11.2℃,14.7℃,18.0℃and23.6℃.Theresultsindicatethatthestandardmetabolicratesincreasewiththeincreaseofbodyweightatdifferenttemperatures.RelationshipbetweenthemcouldbedescribedasRs=aInWb.Themeanofstandardmetabolicrateissignificantlydifferentamonggroups,butthebvaluesarenot.Thestandardmetabolicratesofamendedstandardbodyweightsdecreasewiththeincreaseoftemperature,andthemeanofstandardmetabolicrateisalsosignificantlydifferentamonggroupswhenthestandardbodyweightsare48.6g,147.9g,and243.1g.RelationshipbetweenthemcouldbedescribedasRsw=me-bT.Therelationsofstandardmetabolicrate(Rs)orrelativemetabolicrate(Rs)tobodyweightandtemperatureyieldthefollowingequations:Rs=1.160W0.752e-9.494/7andRs1=1.160W0.254e-9.494/7.

  • 标签: 新陈代谢 黑岩鱼 体重 温度
  • 简介:Themovingparticlesemi-implicit(MPS)methodhasdemonstrateditsusefulnessinpracticalengineeringapplications.Althoughithaswideapplicability,itisstillhardtopredictthepressurepreciselyusingtheMPSmethod.Apressure-convectionparticlemethodbasedontheMPSmethodisproposedtoovercomethisproblem.Theimprovedperformanceofthisnewmethodisvalidatedwithcomputationalandmeasuredresults.Theapproachisalsoappliedtocomputetheproblemofsloshingassociatedwithfloatingbodymotioninwaves.Thepressure-convectionMPSmethoddemonstrateditscapabilitytoimprovethepredictionofpressure.

  • 标签: 压力预测 浮体运动 粒子法 对流 数值模拟 部分填充
  • 简介:Satelliteremotesensingofinlandwaterbodyrequiresahighspatialresolutionandamultibandnarrowspectralresolution,whichmakesthefusionbetweenpanchromatic(PAN)andmulti-spectral(MS)imagesparticularlyimportant.TakingtheDaquekousectionoftheQiantangRiverasanobservationtarget,fourconventionalfusionmethodswidelyacceptedinsatelliteimageprocessing,includingpansharpening(PS),principalcomponentanalysis(PCA),Gram-Schmidt(GS),andwaveletfusion(WF),areutilizedtofuseMSandPANimagesofGF-1.TheresultsofsubjectiveandobjectiveevaluationmethodsapplicationindicatethatGSperformsthebest,followedbythePCA,theWFandthePSintheorderofdescending.Theexistenceofalargeareaofthewaterbodyisadominantfactorimpactingthefusionperformance.Meanwhile,theabilityofretainingspatialandspectralinformationsisanimportantfactoraffectingthefusionperformanceofdifferentfusionmethods.ThefundamentaldifferenceofreflectivityinformationacquisitionbetweenwaterandlandisthereasonforthefailureofconventionalfusionmethodsforlandobservationsuchasthePStobeusedinthepresenceofthelargewaterbody.Itissuggestedthattheadoptionoftheconventionalfusionmethodsintheobservingwaterbodyasthemaintargetshouldbetakenwithcaution.Theperformancesofthefusionmethodsneedre-assessmentwhenthelarge-scalewaterbodyispresentintheremotesensingimageorwhentheresearchaimsforthewaterbodyobservation.

  • 标签: GF-1 satellite IMAGE FUSION methods FUSION
  • 简介:浮标系统的推广是为浮标系统的操作的最重要的过程之一。在现在的学习,包含表面浮标的一个单个点的绳索浮标系统,有部件的电报片断,锚被使用多身体动力学等等建模方法。运动方程在分离节点描述和充分笛卡儿的坐标被开发。然后数字的方法被用来解决平常的微分方程,当锚从董事会正在扔时,动力学模拟被完成。没有电流并且与在浮标系统的电流的不同节点的轨道和速度被获得。电缆线的每部分的短暂紧张力量在推广的进程被分析。当锚正在摸海床和力量将与不同漂浮配置改变的最大的紧张时,数字结果显示短暂收费载重增加到山峰价值。这个工作对浮标系统计划的设计和推广有用。

  • 标签: 浮标系统 动力学方法 单点系泊 部署 多体 完全笛卡尔坐标