动力定位系统与单波束测深仪在科考船定点作业中的应用     

张彬彬  张道建  张海泉  刘凯  张学贤  卢永平 《海洋通报》2020,39(6):651-656

科考船定点作业时会受到海洋风、涌、浪、流等外界环境因素影响，导致工作效率降低，原位测量精度下降，甚至影响作业安全。动力定位系统 （DP） 具有自动定位功能，能够抵抗外界环境因素的影响，可实现科考船高精度定点控位。 单波束测深仪不仅可以测量水深，也可反映水下设备深度信息，可以起到辅助监控水下设备功能。本文在介绍定点作业施工现状与局限性的基础上，分析 DP 系统与单波束测深仪工作原理，以“向阳红 01”船为载体，在定点作业时开启 DP 系统与单波束测深仪，发现该方法可以提高科考船定点作业工作效率、原位测量精度并保障作业安全，可为其他科考船定点作业提供参考。  相似文献   

Natural mortality of cod (Gadus morhua) in the Southern Gulf of St Lawrence     

Sinclair  A. F. 《ICES Journal of Marine Science》2001,58(1):1-10

  相似文献   

派比安台风对上海黄浦江潮位的影响及成因探讨   总被引：3，自引：3，他引：3  

徐建成 《海洋预报》2001,18(1):1-10

2000年派比安台风产生的历史第二高潮位对上海的防汛带来严重影响。本文通过比较历史上的风暴潮，从动力机制、天文高潮与增水极值相碰头，潮波共振和水利工程的影响等四个方面分析了这次风暴潮造成的高水位，及台风余振期边缘波的影响，并用SLOSH（Sea,Lake,Overland Surge from Hurricanes)模式模拟了这次风暴潮，为防台减灾的正确决策提供了理论依据。  相似文献   

Distribution and abundance patterns of two parapagurid hermit crabs (Crustacea: Decapoda: Anomura) along the west and south coasts of South Africa     

AG Wright  TP Fairweather 《African Journal of Marine Science》2020,42(2):177-183

A series of over 6 000 research-trawl samples collected along the west and south coasts of South Africa between 1987 and 2014 were analysed for the presence and biomass of two parapagurid hermit crabs, Sympagurus dimorphus and Parapagurus bouvieri. The percentage of trawls that landed S. dimorphus and P. bouvieri and the mean caught biomass were higher on the west than on the south coast for both the more-abundant S. dimorphus (30.59 vs 5.81% success and 287.88 vs 31.37 kg km^–2, respectively) and for the less-abundant P. bouvieri (13.76 vs 3.58% success and 38.56 vs 16.32 kg km^–2, respectively). Very few parapagurids were caught shallower than 150 m; thereafter, the proportion of trawls containing hermit crabs increased, peaking over the depth range 201–250 m for S. dimorphus (54%) and 401–450 m for P. bouvieri (51%), and declining steadily thereafter. On the west coast, the relative caught biomass of S. dimorphus increased significantly from north to south, but there was no apparent latitudinal trend in relative biomass for P. bouvieri. Similarly, there was a significant decline in caught biomass of S. dimorphus with increasing longitude along the south coast, but no apparent trend for P. bouvieri. Although this represents by far the most comprehensive global analyses of distribution and abundance patterns for parapagurids to date, extremely little remains known about the biology and ecological relationships of these species, or indeed of other members of the group.  相似文献   

珠江口盆地基底结构的综合地球物理研究   总被引：15，自引：2，他引：15  

王家林  张新兵  吴健生  陈冰  钟慧智  郝沪军  李平鲁  苏乃容 《热带海洋学报》2002,21(2):13-22

通过对珠江口盆地重磁资料的分析处理及反演计算，依据盆地的地质、地球物理特征，采取了针对性的综合地球物理研究思路与方法，对地震资料难以解决的珠江口盆地基底结构进行了研究，确定了盆地的重力和磁性基底深度，并对盆地内的断裂和基底岩性作了推断，提供了新的认识，为今后研究提供了依据。  相似文献   

1999年以来台湾及邻近海域7.5级以上强震前的条带现象     

张年明  郑健志 《台湾海峡》2005,24(4):426-432

中国台湾地区地处欧亚板块与菲律宾海板块之间,地震活动频繁．本文报道了 我国台湾地区及其邻近海域1985～2002年间5．5级以上地震的条带内外频度比分 布,并着重研究了1999—2002年中发生的3次7．5级以上地震前的条带现象．其结 果表明:台湾地区近期发生的3次7．5级以上大地震前,5．5级以上地震呈条带分 布．这些条带符合条带内地震个数Nin≥6的条件,符合条带内、外频度比Nin／(Nin Nout)≥75％的条件,也符合条带长宽比大于5的要求,只是与板内地震条带相比,条 带的长度较短．  相似文献   

Experimental activities that intentionally perturb the marine environment: Implications for the marine environmental protection and marine scientific research provisions of the 1982 United Nations Convention on the Law of the Sea     

Philomène A. Verlaan 《Marine Policy》2007

The global community's ability to assess the environmental effects of marine scientific research (MSR) as required by the 1982 United Nations Convention on the Law of the Sea's (UNCLOS) marine environment provisions (MEP) is limited, as shown by experimental activities that intentionally manipulate the marine environment. Such work enhances knowledge of the ocean, but it may also have significant environmental effects. This growing use of the ocean as a laboratory has global scientific, environmental, legal and policy implications. Examined here is the relationship between the MSR and the MEP provisions of UNCLOS. International, science-driven guidelines are proposed.  相似文献   

Industry participation in stock assessment: the New Zealand SNA1 snapper (Pagrus auratus) fishery     

Mark N. Maunder  Paul J. Starr   《Marine Policy》2002,26(6)

We describe industry funded contributions to the assessment of the SNA1 snapper (Pagrus auratus) fishery during the 1990s and discuss the advantages and disadvantages of industry funded research. We also provide background on the history of fisheries management in New Zealand, on the current assessment and management processes, and on the SNA1 snapper fishery. In the SNA1 fishery, the contributions of industry and the cooperation with Government scientists has resulted in high quality assessments. In our opinion, the advantages of industry funded research out weigh the disadvantages and suggest that industry funded assessments are highly desirable and should be an integral part of any management system.  相似文献   

台湾海峡毛颚动物分布的初步研究   总被引：9，自引：0，他引：9  

蒋玫  王云龙  徐兆礼 《台湾海峡》2003,22(2):150-154

本文分析了台湾海峡毛颚动物的种类组成、数量分布特征，并就其与环境因素的关系进行了初步探讨．结果显示与台湾海峡西部、东海等邻近海域相比，本区毛颚动物具种数少，数量小，季节变化幅度较小等特点．它的数量分布状况与闽斯沿岸流、南海西南季风漂流以及黑潮支流在本区运动消长有关。  相似文献   

基于AHP法和灰色模式识别理论的海底管道系统路由定量风险评估   总被引：3，自引：1，他引：3  

徐慧 肖楠郭振邦  王金英 《海洋工程》2005,23(4):105-110

根据海底管道路由潜在风险的特点及风险类型,提出了一种将层次分析法（AHP法）和灰色模式识别理论相结合的海底管道系统路由定量风险评估方法,该方法利用AHP确定风险评价指标体系,运用灰色模式识别理论,建立识别结果标准,并结合实际工程进行计算,计算结果表明该方法是可行的.  相似文献