Gelatinous zooplankton collected and quantified daily at the sluice gate of the Ikata Nuclear Power Station along the coast of Iyo-Nada in the Seto Inland Sea were analyzed for the period 1998-2004 in an effort to correlate the number of these animals with the physical oceanographic conditions. Sudden periodic and nonperiodic increases of gelatinous zooplankton occur repeatedly from early summer to late autumn in nearshore areas. Periodic increases are synchronous with the spring tidal period. Nearshore tide-induced eddy development may play an important role for the aggregation process of gelatinous zooplankton, and the spring-neap tidal variation of the circulation induces increases of the gelatinous zooplankton population in coastal waters of the Iyo-Nada. Nonperiodic increases are attributable to typhoons and other storms. The strong shoreward currents due to the winds caused by these events transport gelatinous zooplankton to nearshore areas.
Data of mooring observation in Kitanada Bay, located on the eastern coast of Bungo Channel in Japan, obtained during summer 2001 are analyzed to investigate a modification process of the semidiurnal internal tide by density currents, occasionally occurring in the channel. The mooring data show that the semidiurnal internal tide has the character of low vertical mode standing wave. When the bottom slope near the mooring station is near‐critical, the energy of the semidiurnal internal tide in the lower layer reached the maximum value. Since the density current modifies the density stratification occasionally creating the near‐critical condition, it strongly affects the intensity of the semidiurnal internal tide energy in the lower layer.
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