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从河口近岸悬沙浓度的影响因素入手,在收集现场实测资料的基础上,对悬沙浓度的变化规律进行分析。通过分析研究,建立了悬沙浓度变化与多因子响应高精度三维数值模型。以黄茅海水域1992年11月15日—19日实测水流、泥沙、风等资料为基础,对模型进行验证。结果表明:模型能较好地模拟河口水流泥沙运动,且计算稳定性好、精度较高。水流、泥沙运动验证成果基本能达到规范要求的精度。 相似文献
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本文根据闽江口潮汐、潮流、风浪、泥沙及水下地形等资料,分析了河口水文泥特性和内沙、外沙浅滩的演变规律,探讨了闽江口建设深水航道的可行性,提高了深水港址布置及相诮的深水道航整治方案,并进行了初步分析和比选。 相似文献
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在分析鸭绿江河口实测水文泥沙资料的基础上,采用MIKE21 FM模块建立了基于多重嵌套网格模式的河口潮流场和泥沙场数学模型,模型范围为上游丹东市的江桥至河口江海分界线以外6~7 m等深线附近,并对2个潮位站、15个流速流向和含沙量测站进行了验证,对现状条件下的河口水域流场和泥沙场进行了数值模拟与分析。研究结果表明:落潮流速一般大于涨潮,沿程变化上浪头港以下2 km附近及斗流浦航槽内平均流速较大,至河口段水面逐渐放宽,致使落潮水流流速有减小趋势;含沙量沿程呈递增趋势,最大含沙量出现在各分汊水道的上口,即斗流浦水域。 相似文献
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在分析长江河口水文泥沙特性的基础上,统计了河口南北支、南北港等汊道河段的悬沙中值粒径值。结果表明,长江河口悬沙较细,悬沙中值粒径变化范围不大,在0.006~0.014 mm之间,在大中小潮过程中各个汊道河段的变化也不大,其中值粒径平均约为0.008 mm。同时从单向水流的挟沙能力出发,引入背景含沙量,对长江口的水流挟沙能力关系进行了探讨。在此基础上,结合数值积分的处理方法及枚举法,对样本数据作物理意义上的涨、落半潮积分平均的处理,并进一步以此推求了长江口南北支、南北港等主要汊道河段的水流挟沙能力。 相似文献
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关于长江口深水航道维护条件与流域来水来沙关系的初步分析 总被引:2,自引:0,他引:2
长江口深水航道一、二期工程建成后,航道回淤量得到了控制。分析其原因,长江流域进入河口的泥沙近十多年来明显减少,但河口水体含沙量并未减少。河口下段由于存在明显的泥沙再悬浮过程,泥沙活动总量远大于流域来沙量。因此,在一定时期内,流域来沙减少不会显著改善航道的维护条件。另一方面,河相关系分析和实测地形资料表明,近十多年来长江口内沙洲面积持续减少,分析认为应与流域来沙减少和变细有关。一段时期内,河床演变趋于活跃,增加了泥沙活动,对航道维护有不利影响。 相似文献
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基于大丰港附近海域实测水文泥沙资料,对目前国内应用较为广泛的5种挟沙力关系式在大丰港附近海域进行应用计算,在此基础上,采用集中系数法和偏离系数法对计算结果进行对比分析。结果表明:河口水流挟沙力公式能较好地反映大丰港海域的水流挟沙情况,并拟合得到适用于大丰港海域的挟沙力关系式,将该公式应用于大丰港实际围垦工程中,通过建立二维水动力泥沙数学模型,计算得到的围垦后垦区海域年冲淤变化趋势,与数值模拟结果基本相同,表明该公式在大丰港海域具有良好的适用性。 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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《船舶与海洋工程学报》2014,(1):126-126
正San Francisco,California,June 8-13,2014.OMAE 2014 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;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field. 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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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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《船舶与海洋工程学报》2014,(1)
正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014. 相似文献
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《船舶与海洋工程学报》2014,(2)
正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas. 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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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