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Abstract |
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A buoy-mounted upward-looking Acoustic Doppler Current Profiler was deployed on the break off the cape
Hagachi where locates the eastern coast of the bay mouth in Suruga Bay,to monitor current variations in the upper
ocean. This study used acoustic backscattering strength data of moored ADCP, for investigate the variation of
zooplankton in Suruga bay. In surface layer, the acoustic backscattering strength has larger value and decrease by
depth. And backscattering strength has seasonal variation and diurnal variation. The backscattering strength was
larger value in night-time at the surface layer. The displacement and distribution of scattering matter indicate the
displacement and distribution of zooplankton, because scattering matter was moving upward at sunset but was
moving downward at sunrise. Zooplankton by detected acoustic backscattering strength has dominant seasonal
variation, i.e. zooplankton increase in spring season and fall season. |
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