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11.
基于局部冲刷研究的大型圆柱周围波浪特性分析 总被引：2，自引：0，他引：2
波浪环境下,大型圆柱的存在改变了周围原有波浪条件,直接导致局部冲刷。利用MacCamy和Fuchs的绕射理论对相对柱径较大(0.15相似文献
12.
通过三维物理模型系列试验,对港珠澳大桥工程西人工岛、岛桥结合跨进行模拟。试验测量了不同波浪入射角度、波高、波周期以及梁底净高等影响因子下的岛桥结合跨箱梁所受的浮托力和水平力,分析了受力随波陡、相对梁底作用高度以及波浪入射角度的变化规律。研究表明,在一定条件下箱梁浮托力和水平力,随波陡的增大而减小,随梁底相对作用高度的增加而增大,波浪入射方向的影响主要表现为与箱梁沿波浪传播方向的有效长度相关。由于岛桥结合跨的特殊性,改进的Douglass公式并不适用于岛桥结合跨箱梁受力的计算。通过主要影响因子的量纲分析,建立针对岛桥结合跨箱梁浮托力和水平力的计算公式。研究成果可为今后同类工程以及数值模拟提供借鉴与参考。 相似文献
13.
Fifteen formulae of wave transmission coefficient for submerged breakwaters obtained during last 3 decades are presented,compared,and analyzed in this paper.The dimensionless parameters mainly involved in this discussion are the relative submerged depth Rc/h,relative wave height Rc/Hi,relative rubble size B/D50,relative breakwater width B/HiL0 and wave breaker index ξ.It indicates that there exist notable differences among the computed results,which mainly originate from the limited experimental conditions and different analytical methods,even though the major tendency keeps similar.It is necessary to conduct more systematic studies to obtain better understanding about the mechanism of wave transmission over submerged breakwaters. 相似文献
14.
运用附加动量法和自适应学习速率对具有一层隐含层的BP网络进行改进，并由此建立神经网络模型来计算孤立被的爬高。将试验值分别与Synolakis公式以及本文结果进行比较，证实神经网络模型计算方法对于计算孤立波的爬高是合适的。 相似文献
15.
透空式水平板波浪上托力计算方法 总被引：6，自引：2，他引：6
在透空式平板波浪上托力试验研究基础上，针对实际工程应用要求，提出相对简便的透空式平板下波浪局部上托力和最大总上托力计算方法，包括上托力大小、分布宽度和发生位置。对具体工程实例的计算结果表明，该方法与实验值有着较好的一致性。 相似文献
16.
The form of Boussinesq equation derived by Nwogu （1993） using velocity at an arbitrary distance and surface elevation as variables is used to simulate wave surface elevation changes. In the numerical experiment, water depth was divided into five layers with six layer interfaces to simulate velocity at each layer interface. Besides, a physical experiment was carried out to validate numerical model and study solitary wave propagation.“Water column collapsing”method （WCCM） was used to generate solitary wave. A series of wave gauges around an impervious breakwater were set-up in the flume to measure the solitary wave shoaling, run-up, and breaking processes. The results show that the measured data and simulated data are in good agreement. Moreover, simulated and measured surface elevations were analyzed by the wavelet transform method. It shows that different wave frequencies stratified in the wavelet amplitude spectrum. Finally, horizontal and vertical velocities of each layer interface were analyzed in the process of solitary wave propagation through submerged breakwater. 相似文献
17.
This paper discusses some previous, and presents some new experimental results on wave transmission over submerged breakwaters. The objective of this study is to evaluate wave transmission coefficient and develop a two-dimensional （2D） model as an improvement to the existing wave transmission coefficient models. Factors which affect wave transmission over stbmerged breakwaters are discussed through a series of laboratory experiments. Basic recommendations for evaluation and design of submerged rubble-monud breakwaters are presented. From the test results, a calculation formula of wave transmission coefficient is proposed. 相似文献
18.
The interaction between waves and porous breakwater has an important theoretical significance and great application value of engineering. In this paper, the tests of the core material’s influence in rubble mound breakwater on wave propagation are carried out. The relations among the transmitted wave height, incident wave element, and breakwater width are discussed. The calculation formula is obtained. The test results show that different core materials have obvious influence on wave propagation. 相似文献
19.
近年来海洋极端天气频发,港珠澳大桥西人工岛地处外海,与其相连接的桥梁非通航跨的桥面高程较低,容易受到海浪侵袭,威胁到岛桥功能的正常发挥和结构自身安全。针对西人工岛桥结合部周围的复杂地形条件,采用OpenFOAM®开源程序,分别对S、SSW和SW三个方向的极端波浪进行了数值模拟。通过数值计算结果与物理模型试验测量值的比较验证了的模型的准确性。分析了不同方向入射波的波高和沿岛体斜坡爬高的变化规律。随着波浪入射角的增大,人工岛南侧斜坡的波浪爬高呈逐渐减小,但在岛体西端靠近桥梁的位置处,波浪爬高逐渐增大;同时也反映了越浪和桥面上水风险的大小。研究旨在为实际工程的管理和设计提供参考。 相似文献
20.
透空式水平板波浪上托力冲击压强试验研究 总被引：7，自引：1，他引：7
首先对以往波浪作用下透空式平板上托力研究进行了回顾，在此基础上，通过系列模型试验，对波浪上托力产生的机理进行了详细的分析和论述，认为透空式平板下波浪上托力主要由一个迅速上升的冲击压强和一个缓慢变化的压强构成，其中冲击压强通常远大于缓变压强，起主导作用，影响其大小的最直接因素为几何因素(即波浪冲击角)、动力因素(包括波高、波速等)和空气垫层因素，由此通过对各影响因素的分析，得到最大冲击压强计算公式，大量试验资料表明，该公式与实验值有着较好的一致性。 相似文献