简介：TheTheGreat-WestDykewithalengthof6.7km,thelargestseawallinChina,wascompletedinJune,1994.Thispaperintroducesstructureoptionsofnibblemoundseawallonsoftfoundationandanewtypeofarmourblock-hexagonmultiholeblock(HMB)andanewmethodoftreatmentforsoftfoundationbyusingunderwaterexplosion.ConstructionpracticeofsomeprojectsinChinashowsthatbyusingthismethodgoodeffectoftreatmentandmarkedeconomicbenefitcanbeachievedbyusingthismethod.

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简介：Basedontheassumptionofglobalsealevelrisingbetween30and100cminthefuture100yearsbyIPCC(1990)inadditiontotheeffectoflocalgroundsubsidence,thecoastlinewillretrogradefor50-70kmwhosealtitudeswillbe2.6-3.3maboveMSLofHuanghaiSeainthewesterncoastalareaoftheBohaibayin2100.Thetransgrassiveareaisabout10,000-11,500km.Iftheeffectofset-upofstormsurgeisconsidered,thetransgressiveareawillreach16,000km.Sealevelrisewhichisaseriouscoastaldisasternotonlyinundatesalotofcoastallowland,butalsoincreasesthefrequencyandintensityofstormtides,andresultsinthesalinizationofsoils.Inviesofthissituationwerecommendatrinitycomprehensivemeasureoftreatment,namely,"buildingseawalltopreventtides-divertingtheHunagheRivertosettleitssedimentloads-raisingtheconstructionalbase".

简介：137个内部独居的波浪(ISW)的一个总数在从三月吕宋岛海峡(LS)向西在深盆进行到2010年8月的一个地实验期间被捕获。系在的观察表明充分发达的ISW向西拥有最大值超过1.8m/s和大约200m的一个振幅的速度。在华南海(SCS)的ISW在7月是很活跃的，它可能由于在夏天的强壮的层化。大多数ISW事件被检测在附近并且在第一or以后第15月亮的白天，显示在SCS的ISW被天文的潮触发。观察ISW的半部分在19:00本地人时间附近被检测，它能被事实解释那种类型--ISW出现在晚上在粗略地一样的时间每天。在Batan岛的区域南方可能是类型的主要来源区域的LS表演的ISW和天文的潮的繁殖方向--ISW，当Itbayat岛的区域南方和Batan岛的南方是可能的时，type-bISW的主要来源区域在系在观察了。而且为在LS从双山脉射出的半天的内部潮的回声，在水下Itbayat岛的山脉南方和Batan岛的南方被相信赞成精力充沛的ISW的产生。

简介：Onthebasisofdataofdriftingbottles'tracksandthecurrentmeasuredinanchoredstations,aswellastemperatureandsalinityobservedincruiseinvestigationsandcoastalstations,ADCPcurrentdataandAVHRRsurfaceseatemperature(SST)dataonthewesterncoastofGuangdong,syntheticresultsofanalysisshowedthatthecoastalcurrentsinthewestofthemouthoftheZhujiangRiverweremainlywestwardinsummer,whichconstitutedthenorthbranchofcyclonicgyreintheeastoftheQiongzhouStraits.PartofitswaterflowedwestwardintotheBeibuGulfthroughtheQiongzhouStraits.ThecoastalcurrentpatternwasnotidenticalwiththetraditionalcurrentsystemwhichflowedwestwardintheQiongzhouStraitsinwinterandeastwardinsummer.Thesummertime'scoastalcurrentwasalwayswestward,maybetemporarilyturningnortheastonlywhenthesouthwestwindwasstrong.TheimportantcharacteristicsofcoastalcurrentonthewesterncoastofGuangdong,intheQiongzhouStraitsandinthenorthoftheBeibuGulfwereanalyzedandtheirmechanismsalsowereexplained.

简介：Byuseofashoreline-changenumericalmodel(GENESIS)basedonone-linetheory,apreliminarymodelingstudyonshorelinechangescausedbyabeachnourishmentprojectinBeidaihe,China,ispresentedinthispaper.Firstly,theGENESISmodelisverifiedandmodelsensitivitytothemajorparameterchangesisdiscussedbysimulatingahydraulicmodeltest.Thebeachnourishmentproject,afterthattheshorelinechangeiskeptbeingmonitored,isasmall-scaleemergencyonecarriedouttousetwobathingplacesonthewestbeachinthesummer,2008.InthispapertheshorelinechangescausedbythebeachnourishmentprojectaremodeledbytheGENESISmodel,andthecomputedresultsfitwellwiththemeasuredshorelines.Withthesamemodelandparameters,along-termperformanceoftheprojectispredicted,andtheresultshowsthatthebathingplacesonlycanbesuitableforbathingin2to3yearswithoutsubsequencenourishmentproject.Therefore,itisproposedtonourishthebeachesintimetokeeptheservicelifeofthebeachinrecentyearsandcarryoutthebeachnourishmentprojectforthewholewestbeachassoonaspossible.更多还原

简介：ExplosionforthetreatmentofunderwatersoftfoundationisatechniquenewlydevelopedinChina.ThispaperdescribestheapplicationofthemethodofexplosiontounderwatersoftfoundationtreatmentoftheGreat-WestDyke,LianyungangPort,includingthetechnicalcharacteristicsandtheeffect,selectionofexplosionparameters,workmanshipofconstruction,requirementsofqualityandinspection,andthelike.

简介：Edgedetectionenablesidentificationofgeomorphologicunitboundariesandthusassistswithgeomorphicalmapping.Inthispaper,anintelligentedgeidentificationmethodisproposedandimageprocessingtechniquesareappliedtomulti-beambathymetrydata.Toaccomplishthis,acolorimageisgeneratedbythebathymetry,andaweightedmethodisusedtoconvertthecolorimagetoagrayimage.Asthequalityoftheimagehasasignificantinfluenceonedgedetection,differentfiltermethodsareappliedtothegrayimageforde-noising.Thepeaksignal-to-noiseratioandmeansquareerrorarecalculatedtoevaluatewhichfiltermethodismostappropriatefordepthimagefilteringandtheedgeissubsequentlydetectedusinganimagebinarizationmethod.Traditionalimagebinarizationmethodscannotmanagethecomplicatedunevenseafloor,andthereforeabinarizationmethodisproposedthatisbasedonthedifferencebetweenimagepixelvalues;theappropriatethresholdforimagebinarizationisestimatedaccordingtotheprobabilitydistributionofpixelvaluedifferencesbetweentwoadjacentpixelsinhorizontalandverticaldirections,respectively.Finally,aneight-neighborhoodframeisadoptedtothinthebinaryimage,connecttheintermittentedge,andimplementcontourextraction.Experimentalresultsshowthatthemethoddescribedherecanrecognizethemainboundariesofgeomorphologicunits.Inaddition,theproposedautomaticedgeidentificationmethodavoidsuseofsubjectivejudgment,andreducestimeandlaborcosts.

简介：北华南海的深海的区域，有活跃、复杂的tectonics，富于天然气和煤气的水合物。当因为特殊构造位置和构造进化过程，构造特征在东方和西方之间显然是不同的时。以海底的地形学，在珀尔河嘴盆的东方架斜坡结构被有宽亚盆和狭窄的干涉高度描绘，而西方(Qiongdongnan盆)结构被狭窄的subbasins描绘并且宽高举。至于结构的特征，深海在东方下垂都是在结构上halfgrabens，由一系列蘸南方的正常差错控制了。当西方下垂时被graben结构主要与在南方和北方指责描述。关于构造进化，当rifting以后阶段在中间的结束完成了时，东方开始了neotectonic活动中新世。在Baiyun下垂，构造活动变得强壮并且被快速的沉淀并且明显的指责描述。而在西方，neotectonic活动在结束开始了与快速的免职和弱差错活动晚中新世。

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