European policies on ship recycling: A stakeholder survey     

《Marine Policy》2017

After almost a decade of intensive regulatory activities focused on ship-recycling around the world, special reference is made to combating the problems of ship dismantling practices on the shores of Southern Asian countries. “The Hong Kong International Convention” was adopted in 2009, to provide a uniform shipbreaking management approach. However, in globalised maritime transport, with the majority of shipowners using Open Registries, the European Union has prepared a common approach considering the implementation of a new legal framework. Regulation 1257/2013 implemented by the EU on ship-recycling should be more rigorous than those in the rest of the world. In this article, stakeholder perceptions of this Regulation are presented, based on an online survey. The results show significantly different perceptions in the ship-recycling industry regarding the developing ship-recycling measures within the EU.  相似文献   

3D Modeling of sediment movement by ships-generated wakes in confined shipping channel     

Shengcheng JI  Abdellatif OUAHSINE  Hassan SMAOUI 《国际泥沙研究》2014,29(1):49-58

Ship-generated waves and return currents are capable of re-suspending significant quantities of bottom and bank sediments.However,most of the previous studies done on the subject do not show how and where sediment is re-suspended by the wakes and the directions of net transport.In this paper,a 3D numerical model based on hydro-sedimentary coupling is presented to search the relationship between the sediment movement,and the pattern of ship-generated waves around and far away from the vessel and the return currents around the ships.The hydrodynamic model is based on 3D Navier-Stokes equations including the standard k-ε model for turbulence processes,and the sediment transport model is based on a 3D equation for the re-suspended sediment transport.The computation results show that the areas of sediment concentration and transport(whether by resuspension or by the bedload) depend mainly on the position,the speed of the ship in the waterways,the kinematics of ship-generated waves and on the return flows.Thus,a map of sediment distribution and the modes of sediment transport generated by the passage of the ship are presented.  相似文献   

The role of the International Maritime Organization in reducing vessel threat to whales: Process,options, action and effectiveness     

Gregory K. Silber  Angelia S.M. Vanderlaan  Ana Tejedor Arceredillo  Lindy Johnson  Christopher T. Taggart  Moira W. Brown  Shannon Bettridge  Ricardo Sagarminaga 《Marine Policy》2012

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日本记纪“船”神话的原始宗教信仰探源     

司志武 《广东海洋大学学报》2012,(2):9-13

日本古代民族来源复杂,但是中国大陆擅长舟楫的各个民族漂洋渡海到达日本列岛的事实早为人共识.作为东亚海洋文化的一个重要内容,中日舟船文化、民俗的交流的历史点滴被《古事记》《日本书纪》记录下来.日本记纪神话所涉及到的对芦苇、楠木、竹等植物的崇拜与中国原始宗教信仰密不可分.通过对上述日本“船”神话的研究,探讨了中日古代人民在涉及江河海洋以及船的信仰上的渊源与异同  相似文献   

Stochastic time-series simulation of wave parameters using ship observations     

Donald R. DelBalzo  John R. Schultz  Marshall D. Earle   《Ocean Engineering》2003,30(11):1417-1432

A stochastic simulation technique was used with ship wave observations, which form the largest world-wide data base of wave information. Twenty years of wave parameter (height, period, and direction) observations from the Comprehensive Ocean–Atmosphere Data Set (COADS) were used as the input data. Simulations were compared to four years of wave parameters from a National Data Buoy Center (NDBC) data buoy near Monterey Bay, CA. The comparisons are satisfactory with differences mainly caused by biases between ship observations and buoy data. The stochastic simulation technique is attractive because it is computationally efficient and few decisions are required for its application. The applied techniques can be employed with global COADS data to simulate wave conditions at many world-wide locations where measurements and hindcasts by computer models do not exist.  相似文献   

Determination of discharge coefficients for a cross-flooding duct     

Mikael Stening  Juha Järvelä  Pekka Ruponen  Risto Jalonen 《Ocean Engineering》2011,38(4):570-578

Cross-flooding ducts are used to equalize asymmetric flooding and, thus, to decrease the heel angle of a ship in an emergency. The present design guidelines for cross-flooding arrangements involve uncertainties associated with the effect of variable structural factors. In this study, scale model experiments were carried out to determine discharge coefficients of a typical cross-duct, with a focus on the effect of structural components such as the girders, stiffeners, and web frame. Flow conditions and configuration of the components were varied in the experiments. The structural stiffeners in the cross-duct were found to notably increase the discharge coefficient whereas the effects of the web frame and the inclination of the duct at an angle of 7° were negligible. The experimentally obtained discharge coefficient values for the cross-duct were considerably lower than the corresponding values computed according to the generally used guidelines of the IMO Resolution MSC.245(83). This indicates that the geometrical properties of the girders in the cross-ducts need to be properly addressed to avoid overestimating the discharge coefficients. Overall, the experimental results formed an indispensable dataset for the validation and further development of CFD approaches.  相似文献   

Effect of roll modelling in beam waves under multi-frequency excitation     

G. Bulian  A. Francescutto 《Ocean Engineering》2011,38(13):1448-1463

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Designing against parametric instability in following seas   总被引：1，自引：0，他引：1  

K. J. Spyrou 《Ocean Engineering》2000,27(6):1001

We investigate the characteristics of parametric instability when very large variations of restoring between the wave trough and the wave crest are taking place, creating a restoring that is alternating between negative (or nearly negative) and strongly positive values. The possible ways to consider the nonlinearities in damping and in restoring are discussed in detail. The boundary separating parametric instability from pure-loss is identified. In depth studies are carried out to ascertain the practical relevance of the parametric mechanism. Instability regions are identified in terms of transient motions, rather than in terms of the customary asymptotic stability chart associated with Mathieu's equation. A basis for comparing parametric roll behavior for different representations of restoring is established. Asymmetric variation laws and bi-chromatic waves are considered.  相似文献   

单波束无人船一体化水下地形建模及辅助分析     

徐启恒  张新长  黄滢冰  陈炽荣 《地理信息世界》2016,(2):62-66

通过搭载单波束测深仪的无人测量船,辅助CORS系统和姿态仪,对长安新区滩涂区进行无验潮模式水下地形测量,建立了滩涂区水下地形DTM模型和水下3D模型。同时,依据测区设计标高,计算填挖土方量,为长安新区滩涂区造陆工程和城镇建设发展提供科学的测量成果并辅助决策。  相似文献   

Is the Northern Sea Route attractive to shipping companies? Some insights from recent ship traffic data     

《Marine Policy》2016

While the media vigorously propagates historic Northern Sea Route (NSR) transits and researchers demonstrate the viability of the NSR, current usage by the shipping industry has been neglected thus far. This study aims to analyse the current ship traffic at NSR using transit data and port call data. The results show that navigation season lasts for five months, and Arc4 and Arc5 vessels are used extensively. Some Asian countries are active participants in the transit activities. NSR seems to be more appealing to liquid, bulk and general cargo transportation. Currently, most activities are still domestic and destinational in nature. The paper provides real statistics that can add value to the viability analysis. It identifies key players of the transits, exhibits trade pattern at NSR, and presents facts that interest shipping companies.  相似文献