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为给长江中游周天河段航道整治提供基础性技术支撑,对该河段开展了河床演变及碍航特性研究。基于已有研究成果,采用实测资料分析的方法,研究河段近期演变规律、航道存在的问题及碍航特性,并对河床演变和航道条件变化趋势进行预测。结合该段航道整治目标,提出航道治理的总体思路。 相似文献
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窑监河段为长江中游著名的碍航河段,根据《长江干线航道发展规划总体纲要》,该河段2020年航道的建设标准为3.5 m×150 m×1 000 m(水深×航宽×弯曲半径),通航保证率为98%。考虑到三峡工程运行以及防洪等外部因素的影响,窑监河段的治理采取远近结合、分期实施的原则,从2009年初开始陆续实施一期工程和乌龟洲守护工程。工程实施以来,航道条件明显改善,取得了较好的工程效果。结合已有研究成果和工程实施以来的资料,对工程实施后的河道变化、航道条件等进行分析,并对该河段治理经验进行总结。 相似文献
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沙市河段为长江中游著名的碍航河段,根据《长江干线航道发展规划总体纲要》,该河段2020年航道的建设标准为3.5 m×150 m×1 000 m(水深×航宽×弯曲半径),通航保证率为98%。考虑到三峡工程运行以及防洪等外部因素的影响,沙市河段的治理采取系统治理、分步实施的原则进行,从2009年初开始陆续实施一期工程和腊林洲守护工程,工程实施以来,航道条件明显改善,取得了较好的工程效果。本文结合已有研究成果和工程实施以来的资料,对工程前后的河道变化、航道条件等进行了对比分析,并结合总体治理思路及本河段存在的问题,提出了后续治理思路。 相似文献
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为更好地指导航道管理维护工作,促进航运发展,介绍嘉陵江航道泥沙淤积原型观测情况,从河段基本情况、水沙特性、冲淤量及淤积变化、深泓剖面冲淤变化等4个方面进行原型观测分析。结果表明:嘉陵江河道受水库回水影响,末端形成淤积造成航道中的水深不够而碍航,或者因河底床沙运动剧烈形成沙坡而突然碍航。结合嘉陵江河段的冲淤分布确定重点碍航段,分析各段航道内冲淤情况,为以后观测治理工作提供可靠参考依据。 相似文献
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《船舶与海洋工程学报》2014,(2)
正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors. 相似文献
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《船舶与海洋工程学报》2014,(4)
正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support; 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划:时间不限的精密预案计划生成作战计划、方案计划或职能计划;时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础,加速应付危机的能力。 相似文献
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In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama?
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form. 相似文献
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桥梁防撞设施物理模型试验 总被引:1,自引:0,他引:1
物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。 相似文献
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印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues. 相似文献