地形性湧昇流の研究

概要

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At natural upwelling zone, phyto-planktons are multiplied by photosynthesis reaction, and rich fish grounds are formed consequently. "Shiomaki Shoo" bank, located off Tsunoshima island, Yamaguchi prefecture, Japan, is known as one of natural upwelling zones. We carried out flow visualization test using topographycal scale model, and found existence of two kinds of Karman vortices in the wake behind the bank top even in submerged condition. The one is collective small size surface vortices observes just behind the bank top. The other is vortices appears by about two or three kirometers pitch after the bank. A brief theoretical analysis indicates that if water depth of a bank top is shallow enough, the flow around the bank is very close to two dimensional flow, which is same one as what is made around island. Thus we found a key to study artificial topolographycally generated upwelling structures on the submerged bank at sea.
社団法人日本船舶海洋工学会の論文
1991-03-29