Usage of autonomous underwater vehicle and autonomous surface vehicle for marine geophysical exploration

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  • 海洋物理探査における自律型海洋ロボットの利活用
  • カイヨウ ブツリ タンサ ニ オケル ジリツガタ カイヨウ ロボット ノ リカツヨウ

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<p>　An AUV is an unmanned underwater robot that can dive under autonomous control with pre-programmed information, and remarkably has developed in recent years. It is benefit that an AUV without the towed cable is not affected by the motions of the mother vessel unlike ROVs and does not need to move with the mother vessel. Its freedom of vehicle movement in water allows it to obtain data over a wide area near the sea bottom. A cruising AUV typically equipped some acoustic instruments such as a multi-beam echo sounder to obtain the detailed bathymetric data. In recent, she has been tried to use for the geophysical exploration survey. For example, the case studies about some anomaly detection associated with the hydrothermal deposit have been reported using the magnetometer and electrometer. As a new geophysical survey using multiple AUVs, the direct current survey and self-potential survey has been conducted using two AUVs for electrical current transmission and receiver, and have successfully detected negative SP anomaly areas and low resistivity zones around the known hydrothermal deposit areas. In addition, an ASV, which is also autonomous robot on the water surface, has been developed. It is expected that AUVs and ASVs will allow us unmanned and labor-saving geophysical exploration in the sea. In this paper, we will overview these underwater robots and introduce their application both in Japan and abroad.</p>

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