共查询到18条相似文献，搜索用时 78 毫秒
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利用OPENGL构建海洋三维景观的方法研究 总被引：4，自引：0，他引：4
利用OPENGL技术研究海洋三维景观的建模方法，对建模机理和场景构建进行深入探讨，提出利用DEM数据和DOM影像数据构建三维景观的方法，及构建背景图的几种方法，纹理影像几种情况的映射方法。并仿真海洋三维场景，由实验数据得到比较好的三维可视效果。 相似文献
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总结了三维地质建模质量控制的关键点,针对常见的问题提出了改善模型质量的具体方法.模型质量控制主要包括2个方面:构造模型和属性模型的质量控制.构造建模质量控制目的是建立符合地质规律的断层模型,正确反映地层间的接触关系,减少异常网格.属性模型质量控制的主要关键点包括:模型与井点数据保持一致;选择合理的变差函数参数;模型的砂... 相似文献
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局部海洋地磁场模型可以为水下地磁匹配导航与磁性目标探测等工作提供高精度的海域地磁背景场数据。针对目前区域地磁场模型构建方法中未考虑到高度或深度变化的影响,截断阶数难以确定及存在边界效应等问题。根据海洋磁力测量的特点,顾及磁测点高度数据,引入粒子群优化的最小二乘支持向量机法(PSO-LSSVM)构建局部海洋三维地磁场模型。在仿真与实测数据建模试验中,与Taylor多项式法、BP神经网络法及曲面样条函数法比较,结果表明,无论是在地磁变化平缓区还是复杂区,PSO-LSSVM法的建模精度均是最高的,建议在局部海洋地磁场模型构建中采用。 相似文献
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Quasi-3D Numerical Simulation of Tidal Hydrodynamic Field 总被引：2，自引：0，他引：2
SONG Zhiyao XUE Hongchao YAN Yixin MAO Lihua XU Fumin
Doctor Senior Engineer College of Harbor Waterway Coastal Engineering Hohai University 《中国海洋工程》1999,(3)
Based on the 2D horizontal plane numerical model,a quasi-3D numerical model is establishedfor coastal regions of shallow water.The characteristics of this model are that the velocity profiles can be ob-tained at the same time when the equations of the value of difference between the horizontal current velocityand its depth-averaged velocity in the vertical direction are solved and the results obtained are consistent withthe results of the 2D model.The circulating flow in the rectangular area induced by wind is simulated and ap-plied to the tidal flow field of the radial sandbanks in the South Yellow Sea.The computational results fromthis quasi-3D model are in good agreement with analytical results and observed data.The solution of the finitedifference equations has been found to be stable,and the model is simple,effective and practical. 相似文献
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Within a shipyard, many designers each have their own design objective cooperating in complex design circumstance that a variety of software tools run on different hardware platforms. Different CAD systems are used by different design stages and departments, and the design result is usually delivered on paper drawings. The proliferation of data and the rising number of disparate data systems do not communicate with each other and certainly do not collaborate. Advanced 3D modelling tools are installed in most of progressive shipyards for advantage to improve their productivities. However these 3D models are repetitiously constructed as per the specified design objectives of disparate software tools in various design stages. This paper describes the development of collaboration modelling framework, knowledge-based design support system, to make a web-based data-sharing collaborative environment potentially allowing to facilitate some applications, construct 3D lines rapidly, translate the product data, and further be capable of providing reasonable model configurations for XML type, and sharing the web services from the Internet to comply with shipyards’ specific strategy for each particular case to be designed. 相似文献
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日照港煤码头浚深工程回淤分析 总被引：3，自引：0，他引：3
采用水动力学三维数学模型对日照港煤码头水域的水动力因素进行了计算,并在此基础上对煤码头浚深工程实施后港池和航道回淤进行了计算分析.计算结果与实测结果比较表明:文中模型较好地重演日照港煤码头水域潮流场,对于港池与航道的回淤分析合理可靠. 相似文献
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长江航道水下地形三维可视化研究 总被引：1，自引：1，他引：0
三维地形可视化技术是现代地理信息技术的研究热点，广泛应用于地理信息的各个领域。通过长江中游太平口水道水下地形的三维建模，阐述了三维地形可视化技术在长江航道测绘领域的应用与发展，通过实例介绍了航道三维立体可视化图的制作过程。 相似文献
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In this study, 1D and 2D shallow-water models were coupled to simulate unsteady flow in channel networks and embayment. The 1D model solved the 1D shallow-water equations (St. Venant) using the Preissmann box method and targeted long narrow reaches of the river networks, while the 2D model targeted broad channels and embayment and solved the 2D shallow-water equations using a semi-implicit scheme applied to an unstructured grid of triangular cells. The 1D and 2D models were solved simultaneously by building a matrix for the free surface elevation at every 1D junction and 2D cell center. Velocities were then computed explicitly based on the results at the previous time step and the updated water level. The originality of the scheme arose from a novel coupling method. The results showed that the coupled 1D/2D model produced identical results as the full 2D model in classical to benchmark problems with considerable savings in computational effort. Application of the model to the Pearl River Estuary in southern China showed that complex patterns of tidal wave propagation could be efficiently modeled. 相似文献