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Spatial variations of waves propagating over a submerged rectangular obstacle

机译:在矩形水下障碍物上传播的波的空间变化

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摘要

Experiments are performed in a wave flume to examine the generation of harmonics by nonbreaking surface waves travelling over a submerged obstacle. Spatial wave profiles are recorded using an optical measurement system, similar to the approach used by Perlin [Perlin, M., Lin, H., Ting, C.L., 1993. On parasitic capillary waves generated by steep gravity waves: an experimental investigation with spatial and temporal measurements. J. Fluid Mech., 255, 597-620]. Moreover, an extended Boussinesq equation developed by Nwogu [Nwogu, O., 1993. An alternative form of the Boussinesq equations for modelling the propagation of waves from deep to shallow water. J. of Waterway, Port, Coastal and Ocean Eng. ASCE, 119(6), 618-638] is used to numerically simulate the wave field. The experimental results demonstrate that non-linear wave effects generate super harmonics, and the amplitude of those harmonics grows as waves travel above the models. The order of super harmonics increases with wave non-linearity. Numerical results are also found to overestimate the amplitudes of super harmonics and the total averaged energy flux.
机译:在波槽中进行了实验,以检查通过在水下障碍物上传播的不间断表面波所产生的谐波。使用光学测量系统记录空间波轮廓,该光学测量系统类似于Perlin所使用的方法[Perlin,M.,Lin,H.,Ting,CL,1993。关于陡重力波产生的寄生毛细管波:空间实验研究和时间测量。 J.Fluid Mech。,255,597-620]。此外,由Nwogu [Nwogu,O.,1993开发的扩展的Boussinesq方程。Boussinesq方程的另一种形式,用于模拟从深水到浅水的波传播。水路,港口,沿海和海洋工程杂志。 ASCE,119(6),618-638]用于数值模拟波场。实验结果表明,非线性波效应会产生超级谐波,并且这些谐波的幅度会随着波在模型上方传播而增大。超谐波的阶数随波的非线性而增加。还发现数值结果高估了超谐波的幅度和总平均能量通量。

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