“数字海底”系统建模中的关键技术研究          下载免费PDF全文

郑彦鹏  刘保华  梁瑞才  毛锋  周文生  苏天赟  傅强 《海洋学报》2007,29(1):81-85

基于“数字海底”系统的理论基础研究和在海底科学应用中的具体实践,提出了“数字海底”的涵义、系统组成和体系结构,对空间数据管理技术、基于XML的WebGIS空间数据表达技术、复杂海底三维建模技术、多源信息的一体化集成显示技术、虚拟现实技术等“数字海底”系统建模中的关键技术进行了探讨,为从事海底资源研究和开发的人员提供各个层次的参考或帮助.  相似文献   

区域海洋地质数据库建设纲要   总被引：5，自引：0，他引：5  

魏合龙  戴勤奋  林峰  王圣洁  何书锋  苏国辉 《海洋地质与第四纪地质》2004,24(1):139-142

区域海洋地质数据库是中国地质调查局基础数据库的一个重要组成部分，是实现地质调查基础性与公益性战略部署的依托。根据区域海洋地质数据库建设的目标与任务，在数据结构和实施步骤等方面进行了初步研究。区域海洋地质数据库及其管理信息系统适合采取基于Web系统的三层体系结构，在数据构成上亦分为区域海洋地质调查原始资料与成果资料，其中元数据库的建设对数据库的应用非常重要，用户可以通过元数据了解数据的存在性、适宜性、有效性等，确定数据的使用方法，因此，元数据库的建设应采用国际已经普遍认可的ISO/TC211发布的ISO19115空间元数据标准。  相似文献   

ELASTIC CLASSIFICATION OF MODIFIED WATER MASS IN SHALLOW SEA     

王凤钦  李凤岐  苏育嵩 《海洋学报(英文版)》1986,5(3):331-339

In this paper, the principle and steps for differentiating water masses by fuzzy cluster method are introduced, and a scalar formula based on Euclidean distance and a method for determining objectively the number of water masses by F-test are proposed. Consequently, a method and specific steps for differentiating modified water masses in shallow sea according to fuzzy elastic classification are given. Computation of the membership degree in which each sample belongs to every water mass determines conveniently and quantitatively the cores, boundaries of water masses and mixed zones. An example for the Huanghai Sea and East China Sea is shown and compared with previous results.  相似文献   

厦门岛东海岸的蚀退与防护   总被引：5，自引：0，他引：5  

高智勇  蔡锋  和转  苏贤泽 《台湾海峡》2001,20(4):478-483

根据波浪输沙和地形对比，对厦门岛东部海岸的岸滩侵蚀动态及演变趋势进行探讨，并根据其海岸特点提出相应的防护对策。  相似文献   

不同季节的企鹅珍珠贝游离珠植核效果比较   总被引：7，自引：1，他引：7  

毛勇  梁飞龙  余祥勇  叶富良 《海洋通报》2003,22(6):88-91

在雷州流沙港湛江海洋大学珍珠研究室实验基地分别于春、夏和秋季进行了企鹅珍珠贝游离珠植核实验。其中，春季插核的死亡率最低，为15.1％--16．2％，留核率最高，为10％左右：而夏季插核的死亡率最高，为63．56％，留核率也仅为2．22％：秋季插核的留核率最低，仅收珠1颗，留核率为0．35％，死亡率也较高，为54.4％。结果表明，春季是企鹅珍珠贝较适宜的插核季节。  相似文献   

仿鱼尾潜器推进系统的水动力分析   总被引：21，自引：3，他引：21  

苏玉民  黄胜等 《海洋工程》2002,20(2):54-59

以开发适用于小型潜器的仿生操纵与推进系统为研究背景 ,对金枪鱼的月牙形尾鳍进行水动力分析。文中将金枪鱼的尾鳍处理为在做横移和摇摆的耦合运动的同时 ,以某一匀速向前运动的月牙形刚性尾翼。计算中应用了双曲面元和压力库塔条件 ,利用面元法计算分析该三维尾翼的非定常水动力性能。探讨了前进速度、横荡和摇首的幅度、频率及其相位差对推进性能的影响  相似文献   

水面皮层破坏-复原过程的实验室模拟研究     

吴永森  吴隆业 《海洋与湖沼》2001,32(6):605-611

依据水面红外发射和红外遥感测温原理，采用HDG－高灵敏度红外测温仪和常规测量仪器相结合的方法，在实验室空气稳定条件下，模拟测得了水面皮层破坏－复原（重建）的热力过程和气－水温差对水面皮层复原过程的影响，获得了大量的测量数据。数据分析表明，当气－水温差从3．0℃变为11．5℃时，水面皮层破坏可导致皮温增量从气－水温差3．0℃时的0．15℃变到11．5℃时的0．45℃，并发现恢复时间与气－水温差呈负线性关系。  相似文献   

A new efficient 3D non-hydrostatic free-surface flow model for simulating water wave motions     

Doo Yong Choi  Chin H. Wu   《Ocean Engineering》2006,33(5-6):587-609

A new three-dimensional, non-hydrostatic free surface flow model is presented. For simulating water wave motions over uneven bottoms, the model employs an explicit project method on a Cartesian the staggered gird system to solve the complete three-dimensional Navier–Stokes equations. A bi-conjugated gradient method with a pre-conditioning procedure is used to solve the resulting matrix system. The model is capable of resolving non-hydrostatic pressure by incorporating the integral method of the top-layer pressure treatment, and predicting wave propagation and interaction over irregular bottom by including a partial bottom-cell treatment. Four examples of surface wave propagation are used to demonstrate the capability of the model. Using a small of vertical layers (e.g. 2–3 layers), it is shown that the model could effectively and accurately resolve wave shoaling, non-linearity, dispersion, fission, refraction, and diffraction phenomena.  相似文献   

Wave interaction with a perforated wall breakwater with a submerged horizontal porous plate   总被引：1，自引：0，他引：1  

Yong Liu  Yu-cheng Li  Bin Teng 《Ocean Engineering》2007,34(17-18):2364-2373

This study examines the hydrodynamic performance of a new perforated-wall breakwater. The breakwater consists of a perforated front wall, a solid back wall and a submerged horizontal porous plate installed between them. The horizontal porous plate enhances the stability and wave-absorbing capacity of the structure. An analytical solution based on linear potential theory is developed for the interaction of water waves with the new proposed breakwater. According to the division of the structure, the whole fluid domain is divided into three sub-domains, and the velocity potential in each domain is obtained using the matched eigenfunction method. Then the reflection coefficient and the wave forces and moments on the perforated front wall and the submerged horizontal porous plate are calculated. The numerical results obtained for limiting cases are exactly the same as previous predictions for a perforated-wall breakwater with a submerged horizontal solid plate [Yip, T.L., Chwang, A.T., 2000. Perforated wall breakwater with internal horiontal plate. Journal of Engineering Mechanics ASCE 126 (5), 533–538] and a vertical wall with a submerged horizontal porous plate [Wu, J.H., Wan, Z.P., Fang, Y., 1998. Wave reflection by a vertical wall with a horizontal submerged porous plate. Ocean Engineering 25 (9), 767–779]. Numerical results show that with suitable geometric porosity of the front wall and horizontal plate, the reflection coefficient will be always rather small if the relative wave absorbing chamber width (distance between the front and back walls versus incident wavelength) exceeds a certain small value. In addition, the wave force and moment on the horizontal plate decrease significantly with the increase of the plate porosity.  相似文献   

珠江口盆地基底结构的综合地球物理研究   总被引：15，自引：2，他引：15  

王家林  张新兵  吴健生  陈冰  钟慧智  郝沪军  李平鲁  苏乃容 《热带海洋学报》2002,21(2):13-22

通过对珠江口盆地重磁资料的分析处理及反演计算，依据盆地的地质、地球物理特征，采取了针对性的综合地球物理研究思路与方法，对地震资料难以解决的珠江口盆地基底结构进行了研究，确定了盆地的重力和磁性基底深度，并对盆地内的断裂和基底岩性作了推断，提供了新的认识，为今后研究提供了依据。  相似文献