海洋走航式单边连续观测地震折射波△t解释方法——1种新的浅层折射单支时距曲线解释方法

在浅层工程折射地震测量中，通常采用相遇观测系统采集数据和相应的解释方法进行解释；对于单边观测采集方法由于与其相应的解释方法较少而少被采用。本文提出1种方法简单、精度可靠、可直接利用同一点相邻2排列2次观测的初至折射时间并适合于海洋走航式单边连续观测系统的折射初至资料解释方法。其精度基本与同观测段的采用相遇观测的差异时距方法解释的精度十分接近。该方法即适合于人工解释又适合于计算机自动解释。     

超大型海洋浮式结构物概念设计的关键技术问题

应用超大型海洋浮式结构物进行海洋空间利用和海洋资源开发，是目前海洋工程界的研究热点。概念设计是超大型海洋浮式结构物研究的基础。本文从设计准则、结构型式、建造材料、模块连接器、系泊系统等几个方面对概念设计的关键技术问题作了归纳，对超大型海洋浮式结构物的概念设计有一定的参考价值。     

A Novel VOF-Type Volume-Tracking Method for Free-Surface Flows Based on Unstructured Triangular Mesh

A novel VOF-type volume-tracking method for two-dimensional free-surface flows based on the unstructured triangular mesh is presented. Owing to the inherent merit of the unstructured triangular mesh in fitting curved boundaries, this method can handle the free-surface problems with complex geometries accurately and directly, without introducing any complicated boundary treatment or artificial diffusion. The method solves the volume transport equation geometrically through the Modified Lagrangian-Eulerian Re-map （MLER） method, which is applied to advective fluid volumes. Moreover, the PLIC method is adopted to give a second-order reconstructed interface approximation. To validate this method, two advection tests were performed for the establishment of the accuracy and convergence rate of the solutions. Numerical results for these complex tests provide convincing evidence for the excellent solution quality and fidelity of the method.     

水下声学定位系统及其应用

分析了短基线、长基线和组合水声定位系统的特点，并就国内外声学定位系统的技术发展，对水声定位系统的分类及其原理、定位精度、发展现状与应用等方面进行了讨论。     

GMRES方法在大型离岸结构水弹性分析中的应用

使用GMRES方法求解了大型离岸结构水弹性分析所获得的复系数线性方程组，并按照向后误差分析的方法，给出了它的终止准则。数值试验表明对于所考虑的问题，GMRES方法优于直接方法。     

海洋硫酸盐还原菌及其活动的经济重要性

文章论述了海洋硫酸盐还原菌的分类学生态学、生化学和方法学等方面的一些问题。讨论了硫酸盐还原作用、微生物腐蚀作用及防腐措施。阐述了它们在海洋工程建设、水产养殖事业中的作用和地位。     

中国近海工程环境参数区划

本文就中国近海工程环境参数区划的原则和方针,内容和方案,资料与方法,计划与合作,成果和目标作了说明。     

An Approximate Method for Calculation of Fluid Force and Response of A Circular Cylinder at Lock-in

In this paper, equations calculating lift force of a rigid circular cylinder at lock-in in uniform flow are deduced in detail. Besides, equations calculating the lift force on a long flexible circular cylinder at lock-in are deduced based on mode analysis of a multi-degree freedom system. The simplified forms of these equations are also given. Furthemore, an approximate method to predict the forces and response of rigid circular cylinders and long flexible circular cylinders at lock-in is introduced in the case of low mass-damping ratio. A method to eliminate one deficiency of these equations is introduced. Comparison with experimental results shows the effectiveness of this approximate method.     

Multi-Objective Optimization of A Semisubmersible for Ultra-Deep Water

Semisubmersible will work well when oil exploitation goes to ultra-deep water because of its variable load capacities, and good motion performance in extreme waves. It is considered to be a main type of platform while the water depth is more than 3000 meters. This paper establishes a multi-objective optimization model of semisubmersible for ultra-deep water, and it is solved by a multi-objective genetic algorithm--NSGA-Ⅱ. The model is applied to a practical design, and Pareto results are obtained. The effectiveness of the method is verified by hydrodynamic analysis.     

现场波浪观测技术发展和应用

介绍与海洋工程有关的应用于水下、水面、水上和太空不同空间位置的现场波浪观测技术。根据不同仪器量测的基本原理,分析其对工程应用的适合性和局限性;并讨论了现场波浪观测的发展趋势以及我国应采取的对策。