Physical environment in coastal waters off Yamaguchi prefecture [Japan], the southwestern Sea of Japan
2005
Kawano, M.(Yamaguchi-ken. Fisheries Research Center, Nagato (Japan))
Physical environment in coastal waters off Yamaguchi Prefecture, southwestern Sea of Japan was studied based on data of bottom topography, texture of sediments, currents, water temperature and salinity. Median diameters (Md phi) were smaller than 2 in waters around Okinoshima Island, Mishima Island and Tsunoshima Island where strong current region existed. In waters shallower than 100 m depth, current velocities were small (10cm/sec) and current directions were almost along isobathes except for waters near coast. Water temperatures at 50m depth and bottom were lowest in February and highest in September-October. Salinity at 50m depth and bottom were highest in February-April and lowest in July-November. The standard deviations of water temperature at bottom were large in waters off northwest of Mishima island, suggesting a bottom cold water often expanded there.
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