胶州湾潮致余环流与水道-沙脊演化

胶州湾保存了较为完整的水道-沙脊体系。在人类高强度工农业活动干预下,水道的稳定是关系到该地区经济可持续发展的重要问题。数值模拟显示,受海岸线和水下地形的控制,胶州湾内外形成了若干规模、强度不等的潮致余环流系统;不同时期的水下实测地形图的对比揭示出沧口水道作为胶州湾内一条重要的黄金水道,呈现出不断淤积萎缩的趋势,据分析与余环流持续提供的细颗粒泥沙淤积有关。胶州湾潮致余环流对维系湾内、外的水力泥沙联系和水道-沙脊体系的演化具有重要作用。     

基于人工神经网络的胶州湾浮游植物生物量模拟

文章首先介绍了BP网络数据标准化、隐层神经元选择、网络训练和有效性检验方法。以2003年胶州湾环境监测资料为基础,建立了多输入单输出的3层BP人工神经网络模型,采用8个水环境因子预测浮游植物生物量(Chla浓度)。检测集样本网络预测值与观测值的相关系数为0.8943,平均绝对误差为11.33%。为避免个别网络输入初值对输出的干扰,采取全局灵敏度的方法,分析了各水环境因子变化对浮游植物生物量的相对影响。结果表明,浮游植物生物量对各水环境因子变化响应的敏感系数顺序为DOCODPO4-PSSTpHOilDINSiO3-Si。     

三臂凿岩台车施工技术在青岛胶州湾海底隧道中的应用研究

通过三臂液压凿岩台车在青岛胶州湾海底隧道施工中的应用研究,充分地发挥三臂液压凿岩台车作业范围大、灵活性强、空气粉尘污染小、安全文明、液压冲击钻高效的技术优势,不仅在Ⅱ,Ⅲ级围岩施工中体现了其无可比拟的优越性,而且在Ⅳ,Ⅴ级及破碎弱风化围岩施工中,也显示了其较强的适应性,实现了快速、优质、安全、高效施工。     

Collaborative Management of Natural Resources in San Diego Bay

This article presents the results of a three-year effort at applying information technology to the problem of collaborative natural resource management in San Diego Bay. As such, it represents an approach to integrated coastal zone management (ICZM). This effort resulted from a collaboration between the San Diego Supercomputer Center at the University of California, San Diego and the San Diego Bay Interagency Water Quality Panel for the purpose of (1) developing an environmental data repository to facilitate the acquisition and sharing of data and (2) the development of a visual model of the bay in support of the development of a comprehensive, coordinated management plan for San Diego Bay. It was determined from this study that information technology is an important and key component to ICZM but that sociopolitical factors may override the benefits of decision-support systems and should be considered at the outset of any project of this kind.     

台州湾跨海大桥通航孔桥结构设计

台州湾跨海大桥通航孔桥为主跨488m双塔双索面叠合梁斜拉桥。该桥位于台州湾椒江口海洋环境中,地质条件差,潮差大,风速高,且通航等级高和耐久性要求高,故建设条件较为复杂。介绍该桥的桥跨布置、约束体系、主梁、拉索、索塔、桥墩和基础的构造,阐述其耐久性设计、抗风设计和防船撞设计等,可供类似桥梁设计时借鉴参考。     

湛江东海岛近岸潮流场数值模拟

将Smagorinsky亚网格模型引入ADCIRC潮流模型求解涡粘性系数,使模型在模拟近岸潮流方面更加合理。为进一步揭示中海油气开发利用公司广东沥青项目码头工程海域的潮流变化,利用改进的ADCIRC模型对湛江东海岛海域潮流场进行了合理地模拟和分析。结果表明该工程港池和进港支航道的开挖对湛江主航道影响很小。工程建设只改变了工程区海域的局部流态,并且新开挖航道的水动力条件有助于船舶顺流进港。     

兴化湾水文泥沙特征分析

使用潮流数学模型、波浪数学模型、泥沙来源与运移趋势分析、泥沙淤积分析、水下地形变化分析等多种手段对兴化湾的水文泥沙特征进行了分析研究     

海底隧道过断层破碎带施工风险分析与应对措施

为了避免胶州湾隧道在穿越多条断层破碎带施工时,发生坍塌、冒顶、突水、突泥等事故,结合青岛胶州湾海底隧道工程设计和施工,通过采用风险分析和评价的方法对过断层破碎带施工风险进行分析,并提出风险的应对措施,风险评估结果可为以后类似工程提供参考。     

Wave climate evolution in the Bay of Biscay over two decades

As a background, a review of long term evolution of wave climate in the North Atlantic is discussed. Most studies show that interannual evolutions in wave heights may be related to climatic factors, such as the North Atlantic Oscillation Index for example.Data of a waverider, consisting of a time series of 20 years in the Bay of Biscay (off Biscarosse, France), are analysed. Based on these data obtained from 1980, wave heights tend to decrease over the period. Also, interannual evolutions exist, particularly in the wave period. The fact that the annual wave periods at Biscarosse are found to vary more significantly than the annual wave heights led us to assume that it is an indirect effect of the evolution in the location of generating storms relative to the buoy. The relationships between wave parameters and climatic factors such as the North Atlantic Oscillation Index and the Garonne discharge have been derived: they show that the NAO index is negatively correlated with the river discharge and positively correlated with the wave period. This result is in agreement with the general climate scheme associated with NAO cycle proposed by Kushnir et al. [Kushnir, Y., Cardone, V.J., Cane, M., 1995. Link between Atlantic climate variability of surface wave height and sea level pressure. Proc. Fourth Int. Workshop on Wave Incasting and forecasting, Banff, AB, Canada, 59–64.]: NAO+ shifts storm tracks northward and dry weather are encountered in the southern part of Europe (conversely NAO− brings storm tracks and rainfall closer). Concerning wave heights, the lack of dependence on NAO index may be associated with compensation effects between wind intensity and storm tracks: wave energy is partly dissipated while reaching the Bay of Biscay in case of severe but distant storms (NAO+), which is not the case for storms generated nearer to the buoy and associated with moderate westerly winds (NOA−). However, the reason of the decrease in wave heights is not clear.     

粤港澳大湾区城际铁路网运营管理模式

通过调研分析粤港澳大湾区内城际铁路运营管理现状,分别对城际类、通道类项目的运营管理模式进行分析讨论。对城际类项目,建议可独立运营的线路采用自管自营模式,与国家铁路联通紧密的广珠线可继续委托广州铁路(集团)公司运营,内地与港澳联合运输线路应与相关方签订联合运输协议。对通道类项目,建议按照高速铁路的运营管理选择代管模式。