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Effects of tidal currents on the sea floor shown by underwater time-lapse photography
Owen, D.M.; Emery, K.O.; Hoadley, L.D. (1967). Effects of tidal currents on the sea floor shown by underwater time-lapse photography, in: Hersey, J.B. (Ed.) Deep-sea photography. pp. 159-166
In: Hersey, J.B. (Ed.) (1967). Deep-sea photography. The John Hopkins Oceanographic Studies, 3. The John Hopkins Press: Baltimore. 310 pp., more
In: The John Hopkins Oceanographic Studies. ISSN 0271-2229, more
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Keyword
    Marine/Coastal
Authors  Top 
  • Owen, D.M.
  • Emery, K.O.
  • Hoadley, L.D.
Abstract
    A six-day series of photographs from a time-lapse camera positioned at a depth of 8.5 m in an area of fast tidal currents revealed movements of the sand bottom caused by the alternating currents. Ripple marks formed and reformed with their steep slopes facing opposite directions for flood and ebb currents, and they moved rapidly down-current at times of maximum current. It was deduced that the speed of the surface current was about twice as great when sand began to move as when sand movement ceased.
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