Sonic wave height meter - Onpahakokei

Japanese: 音波波高計 - おんぱはこうけい
Sonic wave height meter - Onpahakokei

…An experiment covering an area of ​​300 square kilometers was conducted in the Atlantic Ocean in 1981. A sonic wave height meter is installed on the ocean floor and measures the change in wave height by the time it takes for sound waves to be reflected back from the ocean surface. As the water depth increases, the speed of sound changes. This is used to detect the movement of warm and cold water masses, and the IES (inverted echo sounder) is being developed in Japan as well. …

*Some of the terminology used to refer to "sonic wave height meter" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…300km四方の海域での実験が1981年に大西洋で行われている。海底に設置し音波が海面で反射されてもどるまでの時間により波高の変化を求める音波波高計は,水深が大きくなると音速の変化の影響を受ける。これを利用して暖水塊や冷水塊の移動を検出するのがIES(inverted echo sounder)で,日本でも開発が進められている。…

※「音波波高計」について言及している用語解説の一部を掲載しています。

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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