陡坡海岸栈桥式码头波浪浮托力计算

Calculation of wave uplift force on trestle-type wharf on steep coast

针对陡坡海岸栈桥式码头在长周期波和浅水变形工况下的波浪浮托力计算问题,以援萨尔瓦多拉利伯塔德省码头建设项目为例,对于上部结构承受的波浪浮托力采用物理模型试验和国内外相关规范手册的理论计算结果对比分析,结果表明:1)理论公式多适用于行进波,对于长周期的卷破波,很少有适用的理论公式;2)断面物理模型试验考虑了陡坡海岸地形、长周期、波浪浅水变形、波浪破碎等因素,较为贴合实际波况,浮托力试验值相对合理准确;3)波浪浮托力的确定建议综合采用物模试验和理论公式的数值。成果用于水工结构的优化设计,并为以后类似工况的码头设计提供一定的借鉴意义。

To calculate the wave uplift force on a trestle-type wharf on a steep coast under working conditions of long-period waves and shallow water deformation, this paper takes the China-assisted wharf construction project in La Libertad Department of El Salvador as an example. Results of physical model tests and theoretical calculations according to relevant domestic and foreign code manuals are compared to analyze the wave uplift force on the superstructure. The following observations can be made from the results: 1)The theoretical formulas work mostly for progressive waves, and those applicable to long-period plunging waves are rare in number;2)Considering steep coast topography, long period, shallow water deformation of waves, wave breaking, and other factors, cross-sectional physical model test is more in line with actual wave conditions, and the uplift force tested is more reasonable and accurate;3)The wave uplift force should be determined under comprehensive consideration of values obtained from physical model tests and theoretical formulas. The results are used in the optimization design of hydraulic structures, and they provide a reference for future wharf design under similar working conditions.