音おん響きょう測そく深しん

noun

echo sounding

Technical term for measuring water depth by timing the return of a sound pulse. Used in oceanography, hydrography, and navigation.

• 音おん響きょう測そく深しんで海かい底ていの地ち形けいを調しらべる。

  We survey the seabed topography using echo sounding.