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p. 846. Tides and the Earthlocked

  • David George Bowers
  •  and Emyr Martyn Roberts


‘Tides and the Earth’ explains that the energy in tides comes, ultimately, from the Earth’s spin. Tidal streams, rubbing against the seabed, lose energy through friction and, to make up for this loss, energy is transferred into the tide from the Earth’s spin. As a result, Earth’s rotation is gradually slowing and the day is lengthening. Most tidal friction happens in shelf seas, where the currents are strongest and the water is shallow, but there is an additional loss of energy in the body of the deep ocean, through the creation of waves called internal tides, which mix the interior of the deep ocean.

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