講演要旨(和文) | AUVによる磁気探査では,取得した磁場データに機体の姿勢変化の影響が含まれる.そのため,空間スケールや振幅の小さな磁気異常に対しても検出能力を上げるためには,観測する磁場データに対する機体磁化の影響を効果的に補正することが重要となる.JAMSTECが開発したAUV「ゆめいるか」は,観測条件や傾斜面の緩急に併せ機体のピッチ角を水平に保ちながら航行する機能を有する.この機能を活用することにより,AUVによる磁気探査で問題となる機体の姿勢変化の影響をより小さく抑えることが期待できる.本研究では「ゆめいるか」の航行性能を活かした磁気探査を検証するため,3成分磁力計をペイロードとして取付け,ベヨネース海丘において初の磁気探査を試みた.得られた結果をこれまで他のAUV等で取得されているデータと比較し,良好な結果が得られていることを確認した.また,深海磁気探査に「ゆめいるか」を活用できることを示した. |
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| 講演要旨(英文) | In deep-sea magnetic surveys using Autonomous Underwater Vehicles (AUVs), the attitude change strongly affects the calculated magnetic anomalies in addition to the vehicle's permanent and induced magnetic field. For that reason, in order to detect small-scale magnetic anomalies with small amplitudes, it is important to effectively correct the artificial magnetic field caused by the magnetization of vehicle body. AUV Yumeiruka was newly developed by JAMSTEC and is equipped with a canard-X rudder which makes it capable of controlling its attitude angles and keeping the vehicle in horizontal plane during the seafloor survey. With this function, it is expected to reduce the effect of the attitude change of vehicle body, a generally serious problem during the deep-sea magnetic survey by AUV. In this study, we conducted an experimental deep-sea magnetic survey using AUV Yumeiruka for the first time on the Bayonnaise knoll Caldera using the small-type 3-components fluxgate magnetometers mounted on the both side of AUV Yumeiruka. The results show the good quality of the magnetic data as well as the previous study with the other AUVs and we confirmed that AUV Yumeiruka is capable of carrying out detailed magnetic survey in hydrothermal areas. |
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