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HARDBACK
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Figure 1. Standing wave profiles every 1/12 period in a half period based on the third-order truncation of Penney & Price (1952). The length scales are chosen to make the primary wavenumber unity. Wave steepness, H/λ=0.186. The vertical scale is twice as large as the horizontal scale.

Figure 2. Experimental setup of the tank, lighting and imaging system. The spherical lens has a focal length of 1000 mm, the cylindrical lens has a focal length of 6.35 mm.

Figure 3. (a) Maximum wave profiles with crest at center for 3.32 Hz forcing in physical experiments. The five forcing amplitudes are 2.65 mm, 2.87 mm, 3.17 mm, 3.49 mm and 3.87 mm. (b) Forcing frequency is 3.20 Hz, forcing amplitudes are 1.61 mm, 1.92 mm, 3.17 mm, 3.49 mm and 3.88 mm. Wave amplitude increases with forcing amplitude. The vertical scale is twice as large as the horizontal scale.

Figure 4. Maximum wave profiles from physical experiments, all at forcing amplitudes of 3.5 mm. Five forcing frequencies are 3.32 Hz, 3.29 Hz, 3.26 Hz, 3.23 Hz, and 3.20 Hz. Wave amplitude increases with decreasing forcing frequency. The vertical scale is twice as large as the horizontal scale.



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