Question: what is the approximate wavelength of tides?
Answer: Thus, the shallow water celerity depends on depth rather than wave period. . The dominant period of the semidiurnal (twice daily) tide being 12.42 hours and the greatest ocean depths being about 12,000 meters, the corresponding tidal wavelength would be 15,330 km. One twenty-fifth of this is 613 km or 613,000 meters.