STUDY OF UPWELLING PHENOMENA OF ANOXIC WATER 'A-OSHIO'

Jong Seong Yoon, Keiji Nakatsuji, Kouji Muraoka

Abstract


The field data analyses and both two dimensional hydraulic and numerical experiments were performed to understand the physical features of the 'A-oshio' appearance in Tokyo Bay. Lots of field observations show that the 'Aoshio' phenomenon may be intimately related with the upwelling of the anoxic water in the bottom layer under the wind blowing towards off-shore for more than a couple of days. Therefore, the two-dimensional hydraulic and numerical experiments are performed for clarifying the wind-induced upwelling and mixing processes in a twolayered stratified flow system with a downstream open boundary, which is exposed to wind stresses at the water surface. In these experiments, the upwelling phenomena are found to occur only in the range of RiAx(2h1/L) < 12.0. The numerical experiments are quantitatively confirmed to show a good agreement with the results of field observation and hydraulic experiments.

Keywords


upwelling; anoxic water; 'A-oshio'

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