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基于波谱密度特性的海浪仿真研究 总被引：1，自引：0，他引：1
基于密闭液体的体积变化导致压力变化的特性,研制出了一种高响应、高精度的海浪仿真器,能够模拟海浪对任意水深处的影响作用。在保持微小频率段内总能量相等的条件下,通过规则波的合成,获得了描述已知波谱密度的海浪,并由海浪仿真器模拟出了任意水深处所受到的海浪作用,频谱分析表明模拟海浪具有与真实海浪相一致的波谱密度特性。 相似文献
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我国海浪理论及预报研究的回顾与展望 总被引：3，自引：0，他引：3
管长龙 《中国海洋大学学报(自然科学版)》2000,30(4)
作者从海浪谱、海浪统计分布、海浪预报方法及动力机制、破碎波和近岸的海浪 5个方面回顾与总结了我国在海浪理论及预报研究方面所取得的成果 ,最后对我国在新世纪的海浪研究做一展望。 相似文献
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海浪是影响舰船行进和结构设计的最核心的环境要素。海浪参数的统计分析是建立舰船环境适应性长期预测模型的基础。对1993-2011年沿海台站、浮标观测资料,高度计观测资料和船舶报观测资料进行双线性插值,给出了海浪波高的分析场。利用波高分析场对WAVEWATCHIII(WW3)模拟结果进行最优插值同化。给出了海浪统计玫瑰图、极端海浪统计参数和海浪累年二维极值海浪谱等与舰船耐波性有关的海浪统计参数,分析了中国近海的波浪特征。 相似文献
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海浪的视景仿真有重要的应用背景与军事意义。文中围绕如何解决海浪的实时视景仿真问题,讨论了基于海浪谱的不同浪级波面的仿真模型,并讨论了海浪的实时视景仿真实现技术。这些模型与技术对于提高海浪仿真实时性与真实性有一定的参考价值。 相似文献
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1海浪数值预报方法研究概况海浪是一种十分复杂的随机现象,因此海浪的物理机制研究进展缓慢,至今仍没有理论上严密和完善的海浪预报方法。由于海浪的应用性质很强,应用价值很大,所以应用部门不能等到海浪专家把海浪生成机制都弄清以后再来研究计算海浪的方法。因此在研究海浪生成机制的同时就已经开始研究怎样利用风来计算海浪。几十年 相似文献
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基于影象模拟在海洋学上应用的初步探讨,对移行点源兴波中的Ｋｅｌｖｉｎ船波这种较为简单的海洋现象,用影象模拟的方法,即结合数值方法,高度真实感图形绘制、计算机动画仿真等技术,把平面移行点源兴波过程用高度真实感的图形显示在荧屏上,并实现运动过程的显示,其间通过计算原始数据、生成图象、实现动画的步骤,解决了数值计算、Ｚ缓冲区数据显示、光线追踪、动画制作等方面的问题,在较低的计算机硬件要求下得到了较好的模 相似文献
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线积分卷积(LIC)方法是一种针对矢量场数据的可视化技术,本文主要研究了LIC方法应用于海洋流场的可视化质量改进问题。主要包括以下几点改进:根据海流运动方向改变稀疏背景噪声的指向以使流线变得更加细长明亮;针对稀疏噪声中海流变化剧烈的区域流线会出现分叉的问题,采用忽略稀疏背景噪声流线追踪时非主流线部分的纹理点的积分计算方法来解决此问题,同时可以省去不必要纹理点的积分计算的开支,加快显示速度;采用赋予海流随机的初始相位的方法来解决稀疏噪声循环动画突兀的问题;通过流线的运动速度快慢或者流线的颜色来表示海流速度大小;通过对海流数据进行插值并改善边界流线追踪条件的方法可形成完整细致的全球海流图像。实验结果表明,该方法可以生成纹理对比强烈、细节清晰、动画连贯的高质量海流运动图像,具有良好的可视化效果。 相似文献
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深潜救援潜器新型对接技术的仿真研究 总被引：7，自引：0，他引：7
对接技术是利用深潜救援潜器(DSRV)实现援潜救生的关键技术。本文介绍了作者开发的对接系统三维动画仿真软件和利用仿真软件对新型对接系统实施援潜救生进行动态仿真的情况。 相似文献
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广东沿海台风风暴潮可视化预报系统 总被引：5，自引：0，他引：5
广东省地处南海北部,风暴潮灾害严重。为快速准确做好风暴潮预报并将预报结果应用于防灾减灾中,根据南海预报中心多年来在风暴潮数值预报、经验统计方法预报和潮汐预报的实践,研制了可视化软件。此软件可显示广东省28个沿海主要港口的逐时风暴增水与天文潮位的综合潮位曲线与数值,以动态或静态显示广东沿海海面的增水等值线图,成为业务化预报软件。多年的风暴潮数值预报的实践证明,国家海洋环境预报中心王喜年等在八·五攻关项目中推广应用的台风风暴潮模式,在广东沿岸的风暴潮数值预报中效果较好,可视化预报软件采用这一模式是合适的。 相似文献
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D. M. Ermakov E. A. Sharkov I. V. Pokrovskaya A. P. Chernushich 《Izvestiya Atmospheric and Oceanic Physics》2013,49(9):974-985
The trajectory characteristics and the intensity evolution of the Alberto tropical cyclone (TC) in the integral water-vapor field are analyzed in detail using a software-algorithmic complex designed for constructing highly detailed global radio-thermal fields of the ocean-atmosphere system based on microwave satellite measurements. This complex was developed by the authors earlier and allows one to obtain global animated radio-thermal fields with a time step of 1.5 h and a spatial resolution of 0.2°. Special attention is paid to the problem of revealing the energy sources of three consecutive intensifications of this TC. The analysis of satellite data with the use of the animation method developed by the authors shows for the first time that these sources are regions with an increased (exceeding the critical level) integral water-vapor content located in different geographical areas lying along the complex trajectory of the TC with a variable intensity. The first region was located in the equatorial intertropical convergence zone, the second was located above the Gulf Stream water area, and the third resided in the area affected by the Azores High. 相似文献
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Oceanographic data are complex in that they incorporate multiple measurements and various scales. They are truly three-dimensional, and often vary in time. As the ability to acquire data is constantly being enhanced by the introduction of new and increasingly sophisticated instruments, it is challenging for oceanographers to inspect oceanographic processes by analyzing the complex data conventionally. In this article, we discuss an integrated GIS/visualization approach to visualize oceanographic data in Monterey Bay in order to get a better understanding of upwelling processes. The GIS system performs data interpolation, unifies map projection, and filters the processed data to a computer visualization package. The multidimensional visualization and animation features of the visualization tool are used to gain insight into marine upwelling processes. In such an integrated environment, the water properties (i.e., temperature, salinity, and density) in Monterey Bay during upwelling are visualized, and the characteristics of upwelling are examined. The center of upwelling and the maximum depth of upwelling in Monterey Bay during the 1995 upwelling season are identified. The differences in temperature changing patterns between a typical upwelling year and an El Nino year are shown in this study. The integration of GIS and visualization makes it easier for oceanographers to discover and understand upwelling. 相似文献
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Visualizing Upwelling at Monterey Bay in an Integrated Environment of GIS and Scientific Visualization 总被引：2，自引：0，他引：2
Oceanographic data are complex in that they incorporate multiple measurements and various scales. They are truly three-dimensional, and often vary in time. As the ability to acquire data is constantly being enhanced by the introduction of new and increasingly sophisticated instruments, it is challenging for oceanographers to inspect oceanographic processes by analyzing the complex data conventionally. In this article, we discuss an integrated GIS/visualization approach to visualize oceanographic data in Monterey Bay in order to get a better understanding of upwelling processes. The GIS system performs data interpolation, unifies map projection, and filters the processed data to a computer visualization package. The multidimensional visualization and animation features of the visualization tool are used to gain insight into marine upwelling processes. In such an integrated environment, the water properties (i.e., temperature, salinity, and density) in Monterey Bay during upwelling are visualized, and the characteristics of upwelling are examined. The center of upwelling and the maximum depth of upwelling in Monterey Bay during the 1995 upwelling season are identified. The differences in temperature changing patterns between a typical upwelling year and an El Nino year are shown in this study. The integration of GIS and visualization makes it easier for oceanographers to discover and understand upwelling. 相似文献
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A. George Mourad 《Marine Geodesy》2013,36(4):293-313
Abstract Geographic Information Systems (GIS) have been developed during the last decade. Their land‐based applications range from land information management, urban planning, and environmental research to engineering design and management in the utility and oil industries, geological subsurface analysis, and others. However, applications of GIS in the marine environment are still in the initial stages. This may be due to, among other things, the large marine data sets, the demands of 3D data processing, and the difficulty of ocean data acquisition. This article presents the result of the development of an integrated Marine Geographic Information System (MGIS) for the exploration and development of the Exclusive Economic Zone (EEZ) in the U.S. Pacific Islands region by the Pacific Mapping Center, University of Hawaii. Features such as spatial marine data processing, integration of GIS and mapping systems, 3D data structures, and simulation and animation of marine operations are developed and applied in this system. Since MGIS applications in EEZ are related to many disciplines in marine sciences and engineering, an operational MGIS should be an integrated system in which both basic GIS and marine application systems are combined into a single geo‐referenced system, In addition to other applications, this MGIS has been used: (1) to select a potential deep‐water research site off the island of Hawaii for the State of Hawaii Department of Business, Economic, and Development (DBED); (2) to generate a three‐dimensional database and use it for the navigation and simulation of underwater operations of an underwater research vehicle; and (3) to produce two 2° × 2° mosaic sheets of sonar images, which meet the USGS standard for a sonar image atlas. 相似文献