Bottom current - Teisoryu (English spelling)

Japanese: 底層流 - ていそうりゅう(英語表記)bottom current
Bottom current - Teisoryu (English spelling)
This refers to currents near the bottom of the ocean. In the past, it was thought that the seawater on the bottom was almost still, but with the development of underwater cameras since the 1940s, many ripple marks (regular undulations, also known as sand ripples, wave marks, or sand) on the seafloor have been observed, which led to the prediction that currents may exist in the deep sea as well. In the mid-1950s, G. Wüst published theoretical calculations that suggested that there should be currents of 10 to 15 cm per second in the deep sea of ​​the Atlantic Ocean, but it took more than a decade for this to be confirmed.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
海の底近くの流れをいう。昔は海底の海水はほぼ静止していると考えられていたが,1940年代以降の海中カメラの発達により,海底のリップルマークripple mark(規則正しい起伏のこと。砂紋,波あと,砂ともいう)が数多く観測され,深海にも流れが存在するのではないかと予想されるようになった。1950年代の半ばビュストG.Wüstが大西洋の深海には毎秒10~15cmの流れが存在するはずであるという理論計算を発表したが,それが確かめられるまでは十数年を要した。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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