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11.
港珠澳大桥人工岛位于伶仃洋海域,台风期较大的越浪量可能危及人工岛和隧道的运营安全,越浪量是人工岛护岸设计的重要参数。通过波浪断面物理模型,研究人工岛护岸护面块体型式、消浪平台尺度、挡浪墙前护肩宽度等结构参数对越浪量的影响,试验结果表明,坡肩宽度对越浪量的影响非常大,并且越浪量较小时,试验值明显小于当前广泛采用的van der Meer公式计算值,由此针对人工岛护岸结构特点,提出考虑了坡肩折减系数Kc的越浪量计算方法。计算结果与试验数据吻合良好,为人工岛越浪控制措施的采用及后期越浪量预警提供技术支撑。 相似文献
12.
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
13.
The present study aims at the design and making of measuring instrument of whole direct method for bed shear stress under two-dimensional water-flow co-action. The instrument combines the traditional strain gauge with a precise pressure gauge, and adopts the method directly measuring the difference between the lateral hydrodynamic pressure and different head pressures on both sides of the force plate. As a result, such an instrument solves a technical puzzle of the past strain gauge, i.e. the difficulty to set apart shear stress and lateral force. Static force test and sink test both prove that the instrument is precise, stable and applicable to the measurement of rough beds with different shear stresses. 相似文献
14.
斜坡上封闭式水平板波浪上托力分布试验研究 总被引：1，自引：1，他引：0
通过系列模型试验,对斜坡上尾部封闭式平板结构波浪上托力沿板宽分布进行了详细分析,提出板下最大冲击压强和最大总上托力并不一定同时出现,其分布形态可分为局部冲击型和均匀型。由于封闭空气层和底部斜坡影响,较大总上托力形成机理不尽一致,其均匀分布宽度也不相同,可分为气压型和反射型两类,由此提出分类标准,并分别得到压强分布的计算公式。 相似文献
15.
A series of hydraulic model tests are carried out to investigate random wave run-up and overtopping on smooth, impermeable single slope and composite slope. Based on analysis of the influences of wave steepness, structure slope, incident wave angle, width of the berm and water depth on the berm and the wave run-up, empirical formulas for wave run-up on dike are proposed. Moreover, empirical formula on estimating the wave run-up on composite slope with multiple berms is presented for practical application of complex dike cross-section. The present study shows that the influence factors for wave overtopping are almost the same as those for wave run-up and the trend of the wave overtopping variation with main influence parameters is also similar to that for wave run-up. The trend of the wave overtopping discharge variations can be well described by two main factors, i.e. the wave run-up and the crest freeboard of the structure. A new prediction method for wave overtopping discharge is proposed for random waves. The proposed prediction formulas are applied to case study of over forty cases and the results show that the prediction methods are good enough for practical design purposes. 相似文献