耙吸船在航道维护性疏浚工程中的施工技术分析

在航道运营过程中,航道维护性疏浚工程是港口和航道建设中不可缺少的一项措施。由于维护性航道项目存在着泥层薄、回淤快、不能影响航道正常运营等特点,耙吸船的施工效率、质量控制要求非常高,需要选择合理的疏浚船型及施工技术手段进行施工。本文以实际工程为例,对航道维护性疏浚工程实施过程中的施工技术、质量控制方法进行了研究和探讨。     

长江口12.5m深水航道运行期维护疏浚效率分析

文章以长江口12.5 m深水航道维护疏浚工程为例,利用公式计算和现场船舶资料分析,结合航道回淤特点、疏浚工况条件及疏浚船舶性能等因素研究长江口12.5 m深水航道运行期的维护疏浚效率.通过总结、计算发现维护区段航道回淤量在时间和空间分布上高度集中、深水航道大型船舶通航密度大和贮泥坑使用率低是影响深水航道维护疏浚效率的3...     

天津南港航道工程疏浚施工备淤深度研究

以天津南港大航道项目为依托,通过研究航道施工期间的回淤规律,计算并推荐在施工中应预留出的备淤深度,从而达到既能满足航道设计要求、又以最优的超挖量实现施工经济性的目的,从实际施工效果来看具有良好的指导意义,为今后类似工程积累了宝贵经验。 关键词：航道疏浚;回淤;数学模型;泥沙扩散     

黄骅港外航道整治工程对回淤土可挖性影响分析

黄骅港整治工程前,航道内大风回淤后有大段的强淤难挖段。首先分析了黄骅港整治工程前航道内回淤土难挖段的特点,又以大量实测为依据,分析了黄骅港整治工程后航道内回淤土的各项特性、指标的变化,阐述了黄骅港整治工程对航道回淤土可挖性的影响,分析原因认为:黄骅港整治工程掩护了原有强淤难挖段,改善了被掩护段的颗粒组成,提高了回淤土可挖性,航道淤积重心外移,使疏浚力量重分配,提高了疏浚效率,增加了航道水深。     

连云港港15万吨级航道疏浚施工回淤分析与风险识别

本文基于连云港港15万吨级航道2005年11月至2008年9月疏浚施工过程中的大量现场观测资料,进行了施工期泥沙回淤特征分析以及施工期泥沙回淤风险识别。研究表明,连云港航道施工期回淤与自然回淤特征基本一致,但是施工期回淤受大风影响更为显著,大风与设计分摊不足是连云港航道疏浚施工回淤的主要风险因子。     

长江下游福姜沙水道深水航道维护特性分析*

针对福姜沙水道深水航道维护特性问题,采用航道演变、水沙运动基本理论和实测维护量资料分析相结合的研究手段,重点研究福姜沙水道近期航道维护量分布及其响应变化特征。研究表明,在多年自然演变和人工治理工程控制作用下,福姜沙水道已形成福中、福北和福南3条靠疏浚维护的航道并存的态势。上游径流量与航道内疏浚浅区回淤量总体呈良好的正相关关系,航槽疏浚区呈现洪季回淤快、枯季回淤慢的特点。建议下阶段加强福北水道减淤措施研究。     

连云港港区环抱式防波堤对航道回淤的影响

针对连云港港区25万吨级进港航道回淤总量小于15万吨级的现象,从航道回淤实测资料、工程前后水动力环境等入手,借助于潮流数学模型,研究了该现象产生的原因。研究结果表明:疏浚工程和环抱式防波堤工程均会对进港航道的回淤产生一定的影响,但防波堤的影响起主要作用。疏浚工程导致航道流速以减弱为主,因而使得航道回淤略有增加;而环抱式防波堤工程,将使口门附近流速显著增加,从而导致进港航道回淤大幅减小。此外,环抱式防波堤的掩护作用,在很大程度上阻挡了泥沙进入港区,从而使口内航道段回淤也大幅降低。     

疏浚施工中截沙槽的应用

在长江南京以下12.5 m深水航道工程一期疏浚工程施工中,因通州沙航道受裤子港沙尾部右缘淤涨南压影响,水深逐步变差,直接影响了B区的疏浚施工。研究通州沙水域水沙运动特点、床沙特性及潮汐特征;分析河势变化及回淤特点;通过在B区航槽外预设截沙槽,减缓航槽边缘泥沙进入航槽的速度;对实施效果进行总结分析,对工程后续施工提出建议。     

广州港出海航道工程设计特点

广州港出海航道工程具有航道较长、疏浚段多、地质条件复杂、技术难度大.疏浚土处理困难等特点,在大量的调查、研究、论证的基础上,坚持先进安全、经济合理的原则,成功地解决了工程中的航道选线、航道尺度、泥沙回淤、疏浚土处理等关键问题.取得了丰富的研究和设计成果.     

水深维护疏浚技术模式在疏浚工程中的应用

珠海港一直存在比较严重的回淤问题,尤其是近几年不断进行航道升级,需要每年展开水深维护疏浚工程,来有力确保船舶能够安全通航,疏浚泥沙的含水量较高并且施工期间存在较多干扰因素,所致施工维护成本较高且效率较低。本文通过对珠海港疏浚工程开展过程中,结合港区的泥沙来源及回淤强度分布规律,立足珠海市港区维护疏浚的基本需求,提出新型环保疏浚设备技术运用于港区疏浚工程的主要作用成效。     

Errata

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.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

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;     

联合作战计划和执行系统

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。     

Eastbound or westbound ?

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）.     

Recent progress on wave induced loading measurements in warships

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.     

桥梁防撞设施物理模型试验

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。     

印尼某电厂码头水工建筑物设计

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。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

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.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。