简介：Inthepastdecades,twolargescalecoastalengineeringprojectshavebeencarriedoutintheDeepBaysurroundedbyShenzhenCityandHongKongSpecialAdministrativeRegion.OneprojectisShenzhenRiverchannelregulationandtheotheristheseareclamationalongtheseashoreontheShenzhenside.Thetwoprojectsareveryclosetothetwonationalnaturereserves,specificallyFutianinShenzhenandMaiPoinHongKong,whichareimportantwetlandecosystemsworldwide.ThispaperaimstoidentifyandmonitorthemangrovewetlandchangeswithtimeseriesofLandsatThematicMapperimagespreandposttothetwoengineeringprojectsbeinglaunched.Coupledanalysisoftheimageinterpretationresultsandtidaldataacquiredatthesametimeinthecontextofthetwoworksrevealsthatthemangrovewetlandareahasincreasedfromyear1989to1994,andhaschangedlittlefromyear1994to2002.Binarycodingisappliedtorevealthedistributionimageofmangroveateachphase,andthecodingimageshowsthattheconstructionofthetwocoastalengineeringprojectshascausedfrequentchangesinmangrovespatialdistribution.Thestudyalsoshowsthatthechangeisnotsignificantregardingtotheprecisionofthemethodandthenaturalevolutionofmangrovewetland,andtheprojectsdonotcauseapparentlyinfluencesuponthetwonationalmangroveconservationzonesatleastfortheresearchtimeperiod.

简介：ThesouthernLaizhouBayismainlycomposedofsilt-sandycoastswithdiverselandforms,anditsmarinehydrodynamicenvironmentissensitivetohumanactivities.Marinehydrodynamicandsedimentaryenvironmentsofthestudyareahavechangedundertheinfluenceoflarge-scaleportprojectsinrecentyears.Inthispaper,theevolutionofhydrodynamicenvironment,depositionrate,andgeochemicalcharacteristicswerestudiedbasedonsedimentgrainsize,elementanalysisand210Pbdatingoftwocores,inordertoanalyzetheinfluenceofWeifangPortonmarineenvironmentalevolution,andprovidetheoreticalandpracticalbasisforprotectingmarineenvironmentindevelopingmarineresourcesreasonably.Resultsshowedthatsedimentsofthetwocoreswererelativelycoarserandmainlycomposedofsiltysand.Sedimentsabove230cmincoreWF1and218cmincoreWF2weredepositedsince1855whentheYellowRiverappearedtodeposititssedimentswithinthemodernactivedelta,andtheaveragedepositionratewasbetween0.3and0.5cma-1.ImplementofWeifangPortprojectsin1997and2007createdgreatinfluenceonthesedimentaryenvironmentevolutioninthesurroundingwaters,andthedepositionratewassignificantlyincreased.Theaverageannualdepositionrateswere5.1cmand3.5cminWF1andWF2respectivelybetween1997and2007.Contentofheavymetalsinsedimentsshowednoobviouschangeinthevertical,indicatingthattheheavymetalswerelessaffectedbyhumanactivityandtherewasnosignificantaccumulationofsuchmetalsinthestudyarea.

简介：通过黄河三角洲埕岛海域2个典型平台桩柱周围实测水深及海流、波浪资料，研究了淤泥质粉砂海底桩柱周围局部冲刷坑的特征及其发展演化情况，并结合水动力条件对其形成机制进行分析。

简介：在建设海洋基础地理数据库时,数据编制常用墨卡托投影,其投影参数对数据质量有较大影响.为使要素的密度均匀,数据的误差可控,同时适应海图产品生产实际,以纬度小于75°为研究区域,分析墨卡托投影的长度变形及不同基准纬线对制图综合指标对应实地距离的影响,统计分析目前出版海图产品基准纬线设定现状,以此为依据分比例尺级别拟定基准纬线方案,为基于数据库的海图数据编制与产品生产提供参考依据.

简介：日前，由国家基础地理信息中心牵头完成的国家1：5万基础地理信息数据库动态更新（2013年）项目，在北京通过国家测绘地理信息局组织的验收。

简介：GIS的表现形式已经由早期的系统转向了服务,而云计算已经成为支撑GIS服务的一种重要模式。面对广泛而迫切的海洋基础地理信息数据与应用需求,亟需构建一个统一的服务平台。结合云计算和GIS云服务发展现状,提出一个面向海洋基础地理信息、基于混合云模式、面向服务架构的海洋基础地理信息云服务体系架构设想,分析了需要重点研究的存储优化、自适应可视化与并行处理等关键问题,为构建＂按需、实时、动态、易用＂的服务平台提供了参考依据。

简介：介绍了港珠澳大桥沉管隧道碎石基础结构测量控制内容,针对沉管隧道水下标高测量精度高的特点,通过对多波束测深数据的对比分析,验证了测深数据的精度及可靠性.并基于多波束数据量大、相对精度高的优点,提出特制单波束数据与多波束数据相结合的水下标高点面控制法和深水深槽结构物尺寸图上测量法,实现了沉管隧道碎石基础质量全面控制,并为管节安装快速决策提供依据.