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《洋山港区堵汊工程对海底地形影响初探.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第29卷第2期2010年04月海洋通报MARINESCIENCEBULLETlNV01.29,No.2Apr.2010洋山港区堵汊工程对海底地形影响初探杨忠勇,李娜,虞志英,程和琴,李身铎(华东师范大学河口海岸学国家霞点实验室,上海200062)摘要:基于洋山港海域内长系列ADCP断面走航及定点的水文观测资料进行统计分析,讨论洋山港区在I—IⅡ期工程影响下海域内潮动力的变化及其对海床冲淤的影响。结果表明,由于小洋山一镬盖塘、大乌龟一颗珠山及将军帽一大指头岛三个汉道的封堵及填海,在北岛链以小洋山岛为
2、基础形成一长方形陆域,且在陆域南沿形成一长约5.7km的顺直岸线。工程后由于潮流运动的底、侧边界发乍改变,流场随之发生变化,突显潮波运动的菲线性效应和科氏力效应,在以潮动力为绝对手要的水动力自然环境下:北港区潮流速随着工程的进行先剧减后又凹增;工程后海域在涨、落潮流转流时段形成潮流弱环流;手通道北侧涨潮流增强,南侧落潮流增强。海床冲淤环境也随之改变,北港【x=
3、;i『沿水域海床发生微冲,主通道两南海床则淤积。海域内的.10m等深线也东西向警现波状移动。关键词:洋山港:堵汉工程:潮动力变化;非线性效
4、应;海床冲淤中图分类号:TVl48文献标识码:A文章编号:1001.6932(2010)02.0166.06PreliminaryresearchontheimpactofblockingbranchonthetopographyofseabedinYangshanPortYANGZhong—yong,LINa,YUZhi-ying,CHENGHe—qin,LIShen—duo(StateKeyLaboratoryofEstuadneandCo嬲talResearch,EastChinaNorma
5、lUniversity,Shanghai200062,China)Abstract:OnthebasisofstatisticanalysisofobservationaldatafromaseriesofADCPcross·sectionaswellasfixed—pointinYangshanPort.thisthesisdiscussesthechangeofhydro—dynamicaffectedbyI-ⅢprojectsinYangshanPortanditseffectontheer
6、osionanddepositionofseabed.TheresultsindicatethatpluggingandreclamationamongXiaoyangshan—Huogaitang,Dawugui—Kezhushan,Jiangjunmao—DazhitoudaoshapeanapproximaterectangularlandbasedonXiaoyangshanislandschain,andshapeallapproximate5.7kmstraightcoastlineo
7、nitssouthemmargin.AstheboRomandsideboundaryconditionsoftidemovementchange,theflowfiledchangessubsequently,enhancingthenonlineareffectandCoriolisforceeffectoftidemovement.Intheareawherehydrodynamicenvironmentismainlycontrolledbydynamicaltide,thetidalve
8、locityturnsignificantreductioninthefirstandlaterreturnswiththeprojectwork.Tidalgeneralcirculationisformedduringweakflowingtimeaftertheproject,andthefloodtidalvelocityisenhancedinthenoahareaoftheseaandebbtidalvelocitydecreasedinthesouth.Thesiltingandsc
9、ouringenvironmentchangessubsequently,aslightscouringtakesplaceinthenorthareaandsiltingtakesplaceinthesouthwest.The10meterdepthcontourintheseaalsotakesonundulaneemovementintheeast—westdirection.Keywords:YangshanPort;BranchPluggingProject;change
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