简介：井撤退的水的数量是能被使用估计地下水资源并且进一步在地下水系统上评估人的影响的量的变量之一。为水退却的数量的计算的精确性显著地影响地区性的地下水资源评估和管理。然而，抽的分散的地下水，低效的管理，测量错误和无常在地下水退却评价导致了可观的错误。在这研究，改进地下水退却的评价，一条创新途径基于地区性的地下水流动用一个倒置方法被建议数字模型，和这个方法然后在诺思中国平原被使用。方法的原则与观察正在匹配模仿的水层次由调整地下水退却的数量的。另外，水力的电导率的无常分析和为地下水退却的评价的特定的产量被进行。由使用建议倒置方法，估计的年度平均地下水退却是近似第二设置了的24.92m(中等分子的重量，60%PS内容)显示出最好的力量表演(90mW/cm<啜class=“a-plus-plus”>在70点的2吗？？

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简介：Ｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｔｏｍｏｇｒａｐｈｙ：ｃｏｎｓｉｓｔｅｎｃｙｏｆｉｍａｇｅｓａｎｄｇｒｏｕｎｄｗａｔｅｒｐｒｏｓｐｅｃｔｉｎｇＲＵＩＦＥＮＧ１）（冯锐）ＫＵＩＸＩＡＮＧＭＡ２）（马奎祥）ＨＯＮＧＧＵＯ３）（郭鸿）ＣＨＡＮＧＱＵＡＮ...

简介：Groundwaterisastrategicresourceduetoitsusuallyhighqualityandperennialavailability.However,groundwatermanagementallovertheworldoftenlackssustainabilityasevidencedbyfallingwatertables,dryingwetlands,increasingsea-waterintrusionandgeneraldeteriorationofwaterquality.Asgroundwatercannotberenewedartificiallyonalargescale,sustainablemanagementofthisresourceisvital.Anumberofscientifictoolsareavailabletoassistinhistask.Threeitemsarediscussedhere.Theyincludemethodsforthedeterminationofgroundwaterrecharge,groundwatermodelingincludingtheestimationofitsuncertainty,andthenterfacingtothesocio-economicfield.Generallythequalityofwatermanagementworkcanbelargelyenhancedwithnewtoolsavailable,includingremotesensing,digitalterrainmodels,differentialGPS,environmentaltracers,automaticdatacollection,modelingandthecouplingofmodelsfromdifferentdisciplines

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简介：Ordos盆是在西北的中国的大规模沉积的盆。到顶的从底部的hydrostratigraphic单位是pre寒武纪的变形岩石，更低的古生代的碳酸盐岩石，上面对中生代碎屑状的岩石和新生代存款古生代。全部的厚度直到6000m。三个地下水系统在Ordos盆是在场的，基于地质的设置，即石灰岩地区常见的地形地下水系统，白垩纪碎屑状的地下水系统和第四级的地下水系统。这份报纸系统地描述每个系统的地下水流动模式和对地下水资源的全面评价。

简介：Monitoringandstudyofdynamiccharacteristicsofgroundwateraresignificantmethodsofearthquakemonitoringandforecasting.Forresearchongroundwaterdynamics,groundwaterdatingcanqualitativelyandquantitativelyprovidescientificanalysisonthecharacteristicsofgroundwaterrechargeandrunoffaswellasrenewalcapacity.Thisarticleillustratesthemethodsusedgloballyandsummarizesthemainadvancesandachievementsingroundwaterdating.Italsofocusesontherelationshipsbetweengroundwaterrenewalcapacityandseismicmonitoring,groundwatermovementandseismicactivity,shallowgroundwaterrechargeandabnormalinterferenceelimination.Thestudiesshowthatgroundwaterdatingplaysanimportantroleinwater-rockinteraction,andgeologicaltectonicandseismicactivityevaluation.Therefore,groundwaterdatingcanbewidelyusedtomonitorandanalyzetheprecursorinformationinseismicundergroundfluidobservationsinthenearfuture.

简介：Aninverseproblemofdeterminingmagnitudeofgroundwaterpollutioninahydrologicregionisinvestigated.Byapplyingintegralidentitymethods,aconditionalstabilityfortheinverseproblemhereisconstructedwithaidsofanoptimaladjointproblemandasuitabletopology.

简介：数字建模具有在理解地区性的地下水系统的行为的关键重要性。然而，当在长时间跨度上执行高分辨率的模拟时，为能力建模上的需求是集中的。这份报纸论述一个平行程序的应用程序加快在诺思中国平原地下水流动系统当模特儿详细说明。平行程序被在我们的并行计算的框架上重建著名MODFLOW程序实现，它被设计基于补丁的平行数据结构和算法，但是维持compute流动和MODFLOW的功能完成。有超过100万个格子和时间的一十年的详细模型被解决了。平行模拟结果对观察数据和这二个数据通常在好同意的地被检验。为在答案时间的比较，在32个核心上跑的平行程序比最快的基于MICCG的MODFLOW程序快6倍、比基于GMG的MODFLOW程序快11倍。因此，当使用平行程序时，显著计算时间能被节省，它便于在北方中国平原的快速的建模和地下水流动系统的预言。

简介：Thispaperquantitativelyanalyzedgroundwatertablefluctuationscausedbygroundwateroverdraft,andprobedintothepossibilityofdrawingearthquakeprecursoryinformationfromgroundwatertablevariationsonthebackgroundofgroundwateroverdraft.MaineffectfactorsofgroundwaterregimeinBeijingregionincludegroundwaterextractionandrainfall.Thedeclineofgroundwatertablewasdirectlyrelatedtoregionalgroundwateroverdraft.Usingthemethodofcorrelationanalysis,thepaperanalyzedtherelationbetweengroundwateroverdraftandgroundwaterlevelvariations,withtheaimofevaluatingtheeffectofgroundwateroverdraftonwaterlevelsinobservationwellsandprovidingscientificbasisforidentifyingseismicprecursoryinformation.Theresultsindicatethatthevariationsofgroundwaterlevelinslightly-affectedzonesofgroundwateroverdraftcancontainsomeseismicprecursoryinformation,anditispossibletoextractseismicprecursoryanomaliesifpropermathematicalmethodsareadoptedtoremovethetrendcomponentandannualperiodchanges.

简介：Chinaisfacingsevereproblemofwaterscarcity.Agriculturalsector,themainconsumerofwaterresource,hasremarkablychangeditsinstitutionsonwaterresourcedeployment,duetoheavyenvironmentalpressure.Asanewandspontaneousinstitution,groundwatermarkethasdevelopedrapidlyinnorthernChina,andhasimpactsonwaterusingbehaviorsandbenefitsoffarmers.UsinghouseholdsurveydatafromHebeiandHenanin2007,thispaperattemptstopindownthedevelopmentandoperatingofgroundwatermarketinruralChina.Wefocusonthemonopolyandcompetitioninthemarket.EmpiricalanalysisrevealsthatChinesefarmersaretryingtomakerationaldecisionwhentheycompetewithothersingroundwatermarket.Ingeneral,monopolyisnotfierceinChineseruralgroundwatermarket,withgreatvariationsamongdifferentvillagesandevendifferenttubewellswithinonevillage.Tubewellcosts,regulationandthedensityoftubewellsarethemaindeterminantsthataffectmonopolylevelofgroundwatermarket.Tomakewatermarketbenefitmoreandmorefarmersoflowincome,correspondingpoliciesareneededtomodifyitsdevelopmentinthefuture.

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简介：通过从Tangshan的沿海的区域收集地下水样品，中国，影响地下水的化学作文和资源的质量的hydrochemical过程被分析。化学成分，因素分析，和一个图形的方法在这研究被采用。结果证明人的活动显然影响新鲜地下水。在这个区域的南部的部分散布的深地下水被salinization严重地影响，并且在北方的浅地下水也是开始显示出一样的恶化。深地下水的化学集中主要取决于水岩石相互作用，混合盐的水和离子交换处理。与样品C-33的例外，在学习区域的所有地下水样品对喝合适。粗略地，深地下水的一半取样的测试表演有至少一个水质量索引显示它为灌溉化学上值得怀疑或不合适。因此，深地下水正在成为一个不能接受的资源因为在学习区域的地下水质量正在展出降级的符号，灌溉在海岸线附近定位的区域，这被结束。这研究调查结果贡献地下水资源的更好的理解以便支持地区性的管理和保护。

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简介：Astochasticmodelwasdevelopedtosimulatetheflowinheterogeneousmediasubjecttorandomboundaryconditions.ApproximatepartialdifferentialequationswerederivedbasedontheKarhunen-Loeve(KL)expansionandperturbationexpansion.Theeffectofrandomboundaryconditionsonthetwo-dimensionalflowwasexamined.Itisshownthattheproposedstochasticmodelisefficienttoincludetherandomboundaryconditions.Therandomboundariesleadtotheincreaseofheadvarianceandvelocityvariance.Theinfluenceoftherandomboundaryconditionsonheaduncertaintyisexertedoverthewholesimulatedregion,whiletherandomnessoftheboundaryconditionsleadstotheincreaseofthevelocityvarianceinthevicinityofboundaries.

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简介：Abstract:Hydrologicalregimesinfluenceecologicalpatternsandprocessesaswellasalterratesofwetlandevapotranspiration.ThisstudyaimedtoinvestigatetheimpactofgroundwaterfluctuationonevapotranspirationofPhragmitesaustralis.SupportedbyfielddataobtainedfromtheBaiyangdianLakeinnorthernChina,thevariationsingroundwaterlevelswereexplored,andthechangesinsoilwaterandevapotranspirationofreedwereanalyzedtoinvestigatedifferentgroundwaterlevelscenariosusingHYDRUS-1Dmodel.Theresultsshowedthatsoilwatercontent,rechargedbygroundwater,remainedstableinthelowersoillayerbutvariedstronglyintheupperlayerofthesoilprofile;incomparisontoevaporation,Phragmitesaustralistranspirationcontributedsignificantlymoretotheoverallevapotranspirationrate;thehighlevelsofevapotranspirationcouldbemaintainedwhengroundwaterlevelsvarybetween1.0mand1.8m,whileitwasreducedwithanincreaseingroundwaterlevelsasaresultofwaterstressconditions.TheresultsalsoindicatedthattheevapotranspirationofPhragmitesaustraliscouldmaintainhigherevapotranspirationratesundernaturalwaterlevels.Theevapotranspiration,inotherwords,mightbethemainwaterconsumer,butitneverthelesshaslittleeffectonwaterlevelsduringwatershortages.TheevapotranspirationofPhragmitesaustralisrespondedtothechangesingroundwaterlevelscouldhelpresearchersunderstandwaterrequirementsofthewetlandsandestablishsuitablewaterlevelsforthewetlands.