The hydrodynamic response of the York River estuary to Tropical Cyclone Isabel, 2003   总被引：3，自引：0，他引：3  

Wenping Gong  Jian Shen  William G. Reay 《Estuarine, Coastal and Shelf Science》2007,73(3-4):695-710

Hurricane Isabel made landfall along the North Carolina coast on September 18, 2003 (UTC 17:00) and the storm surge exceeded 2.0 m in many areas of the Chesapeake Bay and in the York River estuary. River flooding occurred subsequently, and the peak river discharge reached 317 and 104 m³ s⁻¹ in the Pamunkey and Mattaponi rivers, respectively. The York River estuary experienced both storm surge and river flooding during the event and the estuary dynamics changed dramatically. This study investigates the hydrodynamics of the York River estuary in response to the storm surge and high river inflows. A three-dimensional model was used to investigate the changes of estuarine stratification, longitudinal circulation, salt flux mechanisms, and the recovery time required for the estuary to return to its naturally evolved condition without the storm. Results show that the salt flux was mainly caused by advection, which was induced by the barotropic gradient during the storm event. The net salt flux increased by a factor of 30 during the rise of the storm surge. However, the large amount of salt transported into the estuary was quickly transported out of the estuary as the barotropic gradient reversed during the descent of the storm surge. Subsequent high freshwater inflow influenced the estuarine circulation substantially. The estuary changed from a partially mixed estuary to a very stratified estuary for a prolonged period. The model results show that it will take about 4 months for the estuary to recover to its naturally evolved salinity distribution after the impacts of the storm surge and freshwater pulse.  相似文献   

沙洲并陆与长江口北部岸线的演变   总被引：4，自引：0，他引：4  

凌申 《台湾海峡》2001,20(4):484-489

全新世以来，长江口北岸南通－扬州南部经历了“浅海－陆地”的成陆过程。4ka，B.P．前，本区为一漏斗形的浅水海湾，河口拦门沙极为发育.4ka.B.P。以来，沙洲并岸，河口陆地淤长，长江口北部岸线呈东南延伸之势。  相似文献   

缢蛏滤除率与颗粒选择性的实验研究   总被引：5，自引：0，他引：5  

范德朋  潘鲁青  马甡  董双林 《海洋科学》2002,26(6):1-4

利用4种不同大小的单细胞藻类作为饵料研究缢蛏（Sinonovacula constricta）的滤除率以及缢蛏对不同大小料颗粒的选择性。实验结果表明：3种规格缢蛏对4种单细胞藻类的滤除率表现出相同的变化规律，即随藻类规格的增大，缢蛏的滤除率亦逐渐变大，并且大规格缢蛏的滤除率变化最显著；在饵料颗粒选择性的实验中，小规格缢蛏对大规格（ESD＝8.83），藻类具有较高的选择性，中规格缢蛏对藻类的选择性不明显，而大规格缢蛏则对小规格（ESD＝4.46）藻类具较高的选择性。  相似文献   

海湾扇贝性腺发育的初步研究   总被引：10，自引：0，他引：10  

沈决奋  杨爱国  燕敬平 《海洋与湖沼》1996,27(6):632-636

１９９２年７月－１１月在青岛胶州五号码头养殖海区采集海湾扇贝，定期取样，测壳长、水温，并对性腺进行切片观察，以研究其性腺发育。观察表明，海湾扇贝性腺由３部分构成：滤泡、生殖管和生殖输送管。  相似文献   

夏季风场对长江冲淡水扩展影响的数值模拟   总被引：7，自引：3，他引：7  

朱建荣  李永平  沈焕庭 《海洋与湖沼》1997,28(1):72-79

建立一个σ坐标系下三维非线性斜压陆架模式，研究长江冲淡扩展的动力机制。数值试验再现了夏季长江冲淡水转向东北的现象，夏季风场对长江冲淡水扩展的影响，取决于风速的大小和动向，风速为３ｍ／ｓ的南风，对冲淡水向北扩展的影响比较明显，而当南风风速达到６ｍ／ｓ时，则起着十分显著的作用，西南风加强了冲淡水向东扩展，但对南北向的扩展影响甚微，东南风抑了冲淡水向东扩散，并使之偏向西北，明确阐明了夏季风场对冲淡水扩展  相似文献   

Wave radiation due to oscillation of two parallel spaced cylinders     

Shen Wang 《Ocean Engineering》1981,8(6):599-621

The radiation problem for two parallel-spaced cylinders is studied. The solution is expressed explicitly in terms of well-behaved convergent series with elementary functions, which are convenient for numerical computation and readily applicable for two-dimensional two-body potential problems. The added mass and damping coefficients together with the phase angles of radiated wave potentials for the forced heave and sway motions of two identical submerged cylinders are presented. The results are useful for determination of the hydrodynamic properties of multi-hull semi-submersibles. In view of the close relationship between a radiation and a scattering problem, the application of the results to the problem of energy extraction from water waves is also noted.  相似文献   

Buckling Propagation in Marine Pipelines     

Lin Zhongqin  Shen Huishen Chen Tieyun Dr. Associate Professor  Dept. of Mechanical Eng.  Shanghai Jiao Tong University  Shanghai Professor  Dept. of Civil Engineering  Shanghai Jiao Tong University  Shanghai Professor  Dept. of Naval Arch  and Ocean Eng.  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1993,(1)

The buckling propagation in marine pipelines is studied by means of the cylindrical shell model in this paper. Several parameters including geometrical parameter D/ T, L/ D, physical parameter E and σy are discussed. The computed results are compared with the available experimental data and other computed results, it is found that the present results are closer to the experimental results than other computed results.  相似文献   

华北近海糠虾类研究     

沈嘉瑞  刘瑞玉  王绍武 《海洋科学集刊》1989,(30):189-228

关于我国近海糠虾类Mysidacea的区系，在我国解放前缺乏系统的研究，仅在文献中有零星记载。Nakazawa 1910 年曾报告了Gastrosaccus vulgaris Nakazawa产于中国，我们推测这很可能是 Archaeomysis kokuboi Ii，1964。W. M. Tattersall 1921年的远东甲壳类论文中记述了Neomysis nigra Nakazawa, 1910和N. awatschensis(Brandt, 1851)两种；后来的研究证明，前者是N. awatschensis( Brandt, 1851)的同物异名，后者实际上是N. intermedia Czerniavsky, 1882的同物异名。我国解放后，沈嘉瑞报告江苏奉贤近海甲壳动物时记述了中华刺糠虾新变种Acanthomysis longirostris var. sinensis Shen；Ii 1964年在《日本动物志》中分别记述了黄海、东海和南海的Siriella.trispina Ii, Gastrosaccus hibii Ii, G. formosensis Ii, Acanthomysis sinensis Ii,Anchialina media Ii 等6个新种。Nouvel 1973年， Murano 1974年分别发表了Pseudoxomysis caudaensis Nouvel, 1973和Pseudomma bispinicaudum Murano, 1974两种。作者和蔡秉及自1980年以来分别发表了多篇糠虾类分类区系研究论文，但主要记述了东海和南海的种。 本文根据的材料主要是中国科学院海洋研究所自1950年以来先后在我国北部沿岸海域调查所积累的大量标本和与中国科学院动物研究所1954-1956年在烟台鲐鱼场调查所采的标本，还有其它单位赠送的少数标本。这些材料较清楚地反映了中国北部糠虾类动物区系的基本面貌。但随着调查的深入还将会有新的发现，如盲糠虾属Genus Pseudomma的小形外海种等。 中国北部的糠虾类和其它甲壳动物一样，与南部热带和亚热带海区相比，种数显著较少；但其中有些种，如Neomysis awatschensis, N. orientalis, A. longirostris, Castrosaccus pelagicus数量却相当大，是经济鱼类和底栖虾蟹的重要饵料，其中有的种还大量存在于沿岸水域和池塘中，可作为鱼虾养殖的天然饵料。 本文初稿于1957年写成，由于刘瑞玉工作方向的改变而未能及时发表。原报告包括13种，内有5个新种。种的检索表曾油印后在国内交流。1964年Ii的专著发表后，初稿中4个新种失去意义。最近经第三作者王绍武再次整理补充，共鉴定16种，分隶于3亚科8属，其中有2新种，7个新记录。  相似文献   

On hydraulic falls of two-layer flow     

Xu Zhaoting  Lou Shunli  Tian Jiwei  Samuel Shan pu Shen 《海洋学报(英文版)》1996,15(2):179-191

Ｏｎｈｙｄｒａｕｌｉｃｆａｌｌｓｏｆｔｗｏ－ｌａｙｅｒｆｌｏｗ￥ＸｕＺｈａｏｔｉｎｇ;ＬｏｕＳｈｕｎｌｉ;ＴｉａｎＪｉｗｅｉａｎｄＳａｍｕｅｌＳｈａｎｐｎＳｈｅｎ（ＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃａｌＤｅｅａｎｏｐａｐｈｙａｎｄＰｈｙｓｉｃａｌｏｃ...  相似文献   

仿刺参(Apostichopus japonicus) mtDNA三个基因片段的序列分析   总被引：10，自引：0，他引：10  

李颖  刘萍  孙慧玲  马甡  高天翔  王清印 《海洋与湖沼》2006,37(2):143-153

采用PCR技术对中国烟台、威海和莱州三个地点仿刺参的16S rRNA、COI、IrRNA-COI三个mtDNA基因片段进行了扩增和测序,分别得到了长度约为570bp、640bp和900bp的三段序列,分析了三个采样点样品的遗传多样性。结果表明,每段基因序列扩增均获得两种单倍型,已在Genbank中注册(注册号码:AY852278—AY852283)。通过比较,三个地点样品的序列差异不显著,无缺失、插入、颠换的现象,只有个别位点出现转换,其中16S rRNA序列最为保守,16S rRNA、COI、IrRNA-COI三段序列A T的平均含量为56·2%、59·2%、61·8%,均大于G C含量。三个采样点样品同源性为99·84%—99·96%。将获得的仿刺参DNA序列和Genbank中的来自东太平洋8个外群进行基因序列比较,结果发现,不同目、科的海参的序列差异显著。采用DNAsp统计了各类位点数;MEGA2·1分析了碱基组成和遗传距离,构建了系统树。系统树体现的分类关系与这些物种的形态学分类关系完全一致。  相似文献