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Bedforms produced by the Kuroshio Current passing over the northern Izu Ridge |
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| Authors: | |
| Institution: | (1) INSTAAR, University of Colorado, 1560 30th Street, Campus Box 450, Boulder, CO 80303, USA;(2) Deep-Sea Research Department, JAMSTEC, 2-15 Natsushima-cho, 237-0061 Yokosuka , Japan;(3) Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano, 164-8639 Tokyo , Japan |
| Abstract: | Current-generated bedforms were found on sandy seafloor at water depths of 200–400 m on the northern Izu Ridge, where the Kuroshio Current encounters and passes over the ridge. The observed bedforms include large dunes and sand ribbons and are interpreted to be products of present-day oceanographic conditions and to indicate intensive flow activity controlled by local topography. A comparison between the surface flow velocity estimated from empirical relationships for dune formation and the observed flow velocity suggests that the dunes are generated when the main axis of the meandering Kuroshio Current passes through this area, and that subsequent current velocities are sufficiently high to maintain the dunes up to the next event. |
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