简介:ItwasagreathonourandprivilegetobeelectedPresidentofWASERduringthefirstCouncilmeeting,heldinBeijinglastSaturday.IhopethatIwillbeabletofulfiltheexpectationsofthosethatelectedmeandIlookforwardtoservingtheAssociationandpromotingitsdevelopment.Asahydrologist/geomorphologistwhostartedworkinginthefieldoferosionandsedimentationsome35yearsago,
简介:ThevariationsintheEarth’srotationareimportanttospacedynamictheoryandnaturaldisastersbecausetheyaffectthelength-of-day(LOD)andconsequentlyhumanlives.Weusemaximumentropymethod(MEM),Lombmethod(LOMB),andphasedispersionminimization(PDM)todeterminethenaturalperiodsofequallyspacedLODtimeseries.WetransformtheobservationalmonthlyLODtimeseries(LODM)tounequallysampledseries(LODMD)byremovingeveryfourth,third,andhalfofthetotalsamples.WealsoapplysplineinterpolationtoLODMDtoyieldequallyspacedtimeseries(LODMDN).Theresultssuggestthatregardlessofthetimeseries,theMEMfrequencyis0.1660month^-1and0.0840month^-1,whereasLOMBandPDMyield0.166month^-1and0.083month^-1,respectively.Furthermore,missingdatathatarelessthanhalfofthetotaldataorsplineinterpolationdonotaffecttheanalysis.Fortheamplitude,neithermissingdatanorsplineinterpolationaffecttheanalysis.
简介:DevelopedatColoradoStateUniversity,CASC2D-SEDisaphysically-basedmodelsimulatingthehydrologicresponseofawatershedtoadistributedrainfallfield.Thetime-dependentprocessesinclude:precipitation,interception,infiltration,surfacerunoffandchannelrouting,uplanderosion,transportandsedimentation.CASC2D-SEDisappliedtoGoodwinCreek,Mississippi.Thewatershedcovers21km2andhasbeenextensivelymonitoredbothattheoutletandatseveralinternallocationsbytheARS-NSLatOxford,MS.Themodelhasbeencalibratedandvalidatedusingrainfalldatafrom16meteorologicalstations,6streamgaugingstationsand6sedimentgaugingstations.Sedimenterosion/depositionratesbysizefractionarepredictedbothinspaceandtime.Geovisualization,apowerfuldataexplorationtechniquebasedonGIStechnology,isusedtoanalyzeanddisplaythedynamicoutputtimeseriesgeneratedbytheCASC2D-SEDmodel.
简介:Phosphorus(P)fractionationandsorptionbehaviorwerestudiedinthesedimentsoftwocalcium-sulfate(Ca-SO4:Ca2t170mgL-1;SO42-400mgL-1)waterreservoirsinthesoutherncentralArgentineAndes-ElCarrizalReservoir(ECR),whichstratifiesinsummerandElNihuilReservoir(ENR),whichisverticallymixedthroughouttheyear.Sedimentsizeclassesreflectedthelithologyofbothbasinsandthereservoirsrelativelocation:ECR(downstreamfromavalleyadjacenttoamountainenvironment)hadhigherclayproportionswhilethesandfractionwasmoreimportantinENR(justnexttoamountainenvironment).Inbothreservoirs,thechemicalcompositionrevealedlowalterationandcalciumenrichment.TotalPcontentwasrelativelyhigh(1.1-1.6mgPkg-1dryweight)asexpectedfromthecontributionofmarineformations.PfractionationwasdominatedbyCa-P(ECR,69%andENR,63%)followedbyorganic-P(23%)insummer-anoxicECRandbyiron/aluminum(Fe/Al)-P(27%)inoxicENR.BatchexperimentsshowedthatsorptionbehaviorinECRhadatypicalLangmuirisothermplotwhileinENRthatmodelfittedonlyatlowdissolvedPvalues(o5mgPL-1)andco-precipitationevidencewasobservedathigherPconcentrations.ItisproposedthatlowerFe/Al-Pcontentinanoxic(ECR)vs.oxic(ENR)sedimentsresultsfromthePreleasedfromiron-boundphosphorusduetosulfatereduction-ferroussulfideformationinananoxicenvironment.ThisconditionshouldenableECRsedimentstoadsorbPintofreshoxidizediron,andENRsedimentstoco-precipitatePwithcalciumduetoFe/Al-Psaturation,asobservedinbatchexperiments.ThispaperconstitutesthefirstdescriptionofphosphoruscontentanddynamicsinreservoirsedimentsinaridcentralwesternArgentina,wherewatersulfateconcentrationsarenaturallyhighduetobasinlithology.
简介:Inthispaper,ahorizontal2-Dnumericalmodelhasbeendevelopedtosimulateflowprocessesindikeburst.Thefinitedifferencemethodisusedincomputation.Themodelemploys2-Dflowequationsandcansimulatecomplexflowswhensupercriticalflowandsub-criticalflowexistsimultaneouslysuchashydraulicjumps.Severalsimulatedresultsareworkedouttodemonstratetheapplicabilityofthenumericalmodel,suchasfloodpropagationonadrybedofacomplexterrain.
简介:盖住北方Shaanxi斜坡和Tianhuan消沉的黄土高原由地区性的单斜层组成,在东方高、在西方低,与不到10的剧降。在这个区域的结构的运动是弱的以便差错和本地结构很好没被开发。作为有大小的结果,众多的宽、轻轻的鼻子和小陷井,不到50m在大向西蘸的单斜层上被开发。包括在Ordos盆的中生代油水库和古生代的煤气的水库,水库是主导地有结构的水库的一个小数字的lithologic。单个水库与大侧面的变化,强壮的anisotropy,低孔,低渗透,和低丰富作为薄被描绘。为预言微妙的lithologic水库的水库厚度,物理性质,和烃潜力的一系列途径基于侵蚀表面的解释被建立。关键词当模特儿-侵蚀表面-解释-Seisnmic数据和水库预言
简介:ThecrookedseismiclinesalongvalleyswereirregularpreviouslyinFuxianofShanbei,showinganirregularbranchinplane,andhardtocompleteclosegrids.Therefore,it'sdifficulttoconductreservoirinversionof2Dseismicdata.In2001,ZhongyuanOilfieldCompanycarriedoutthestudyonfieldacquisitionmethodsandseismicprocessingtechnologyinFuxian.Straightlineswerepassingthroughplateausandformedseismicgridsbyusingflexiblegeometrywithvariablelinearbins.Dataprocessinginvolvedmodel-inversionbasedrefractionstaticcorrection,surfaceconsistentamplitudecompensation,deconvolution,andpre-stacknoiseattenuation.Astheresult,seismicdatawithahighfidelitywasprovidedforthesubsequentreservoirpredictions,small-amplitudestructureinterpretationandintegrativegeologicstudy.Becausealllineswerejointedtoformgrids,comprehensiveinterpretationofreservoirinversioncouldbefinallyimplementedbyusingthepseudologgingmethodtocontrollineswithoutwells.
简介:地震数据规则化是地震信号处理中一个重要步骤,近年来受到广泛关注的压缩感知技术已经被应用到地震数据规则化中。压缩感知技术突破了传统的Shannon-Nyqiust采样定理的限制,可以用采集的少量地震数据重构完整数据。基于压缩感知技术的地震数据规则化质量主要受三个因素影响,除了受地震信号在不同变换域的稀疏表达和11范数重构算法的影响外,极大地取决于地震道随机稀疏采样方式。尽管已有学者开展了2D地震数据离散均匀分布随机采样方式研究,但设计新的稀疏采样方案仍然很有必要。在本文中,我们提出满足Bernoulli分布规律的Bernoulli随机稀疏采样方式和它的抖动形式。对2D数值模拟数据进行四种随机稀疏采样方案和两种变换(Fourier变换和Curvelet变换)实验,对获取的不完整数据应用11范数谱投影梯度算法(SPGL1)进行重构。考虑到不同随机种子点产生不同约束矩阵R会有不同的规则化质量,对每种方案和每个稀疏采样因子进行10次规则化实验,并计算出相应信噪比(SNR)的平均值和标准偏差。实验结果表明,我们提出的新方案好于或等于已有的离散均匀分布采样方案。
简介:持续城市的排水系统沿着道路并且在城市的区域被造收集城市的流量并且避免泛滥,并且过滤水污染物质。流量收集的沉积在stormwater盆被扔,日益增多地,还原剂浇渗入效率,导致堵塞盆。为了更好帮助stormwater盆经理和股东,理解并且预言堵塞率以便详细描述维护计划和时间表,水运输预言模型是必要的。然而因为在stormwater盆内的异构的沉积水动力学性质,一二维(2-D)水流动模型被要求尽可能精确地预言水层次和可能的溢出。浸透的水力的电导率(K)和保留弄弯的沉积水在stormwater盆的全面沉积层被测量,除了沉积层厚度和有机物内容(11个采样点)。沉积深度被用来预言有机物(OM)内容,并且OM被用来预言K。在盆的水高度被考虑沉积水动力学性质分发与HYDRUS-2D模型一起建模。HYDRUS-2D模型给了测量数据的一个令人满意的代表。stormwater盆沉积的水力的性质的情形随着时间的过去被测试,并且水力的抵抗,R,被计算估计stormwater盆表演。在20年工作以后,目前,stormwater盆仍然保证有效的水渗入,而是第一流出(水力的抵抗,R>24h))被期望出现在下一5年里,并且堵塞R>47h)在下一13年里。这个2-D水平衡模型使集成stormwater盆的水动力学异质可能。更好预言2-D/3-D沾染物运输给有趣的观点。