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天津港东疆港区人工沙滩冲淤稳定性试验研究 总被引:1,自引:0,他引:1
利用整体潮流泥沙物理模型及波浪水槽模型,对天津港东海岸人工沙滩的冲淤情况进行了实验研究,由于该工程海岸属典型的流泥质,人工沙滩在亲水段的潮问带内必然产生淤积,年约5 cm.人工沙滩在有掩护条件下,10年一遇波浪基本稳定,50年一遇大浪沙滩剖面变形,单宽流失量约3.3 m3/m. 相似文献
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基于波浪泥沙物理模型,考虑不同水位条件、不同重现期的波浪作用以及复坡和单坡2种不同坡度的沙滩坡面,对斯里兰卡科伦坡港口人工沙滩的冲淤情况及稳定性进行试验研究。结果表明,在次生波作用下,沙滩出现了不同程度的冲刷,沙滩剖面出现冲刷的主要部位一般位于水面线以下的波浪破碎带内,但当波浪条件增大时,人工沙滩剖面在水面线以上也呈普遍冲刷状态。在试验工况范围内,外海水位越高,波高、周期越大,防波堤堤后的次生波越大,所造成的沙滩剖面变形越大,冲刷深度越大。复坡和单坡2种不同坡度方案滩面泥沙在次生波作用下的冲淤部位基本相似,剖面稳定性相当。 相似文献
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《水道港口》2015,(6):467-473
文章针对潍坊滨海旅游度假区人工沙滩防护工程进行研究,分析了工程海域自然条件和沙滩侵蚀成因,对滩沙水力特性进行了实验研究,最后通过波浪泥沙整体物理模型试验手段,分析了丁坝防护工程建设后的整治效果。其主要结论如下:潍坊滨海旅游度假区人工沙滩侵蚀的破坏性动力来自NE向波浪的持续向西输沙;正常天气下人工沙滩年损失量约为2万m~3,在极端高水位下如遭遇10 a一遇大浪作用24 h条件下,沙滩损失量为1.2万m~3,人工沙滩年损失量约为7.7万m~3;优化方案实施后,防护工程实施1 a后,人工沙滩年损失量约为6.4万m~3,约占总铺砂量的6%;且抑制东湾内泥沙在风暴潮增水作用下向西湾输送,达到了优化目的。 相似文献
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某海水浴场受周边工程影响近年发生海岸侵蚀,沙滩流失。本文首先分析了其侵蚀原因,有针对性地提出多个整治方案,采用波浪数学模型进行比选分析,提出推荐方案,并对推荐方案进行泥沙物理模型试验。最后对各方案的整治效果进行比较,可为类似工程提供参考。 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