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- W2082535243 abstract "The autonomous underwater vehicle r2D4, constructed in 2003, is a cruising type AUV weighing 1,600 kgf with a length of 4.4 m. It is fitted with a side scanning sonar, an interferometry sonar, a CTDO, and an in-site chemical analyzer GAMOS for measurement of manganese concentration. The AUV r2D4 has been deployed off Sado-ga-shima Island along a fault line in the Sea of Japan (2003), over Kuroshima Knoll (2003), North West Rota 1 Underwater Volcano (2004) where it took video images of plumes, and Myojin-sho Underwater Crater (2005), and demonstrated its high performance in autonomy and reliability in hostile environments. During NH06-4 Leg 3 cruise in December 2006, we deployed r2D4 in the rift valley of Segments 15 and 16 of the Central Indian Mid-Ocean Ridge System. The first area r2D4 surveyed is Roger Plateau (tentative name) at 19 34S, 65 51E. The AUV r2D4 performed three separate dives and found some anomalies in the concentration of manganese, but we could not identify the location of the origin of these anomalies. The second area is a narrow gorge in the middle of segment 16. The AUVr2D4 descended to the east peak of the rift valley, with a depth of 2,400 m, near the center of the gorge. After calibration of its magnetometer, the AUV jumped off the cliff to the bottom of 2,700 m deep gorge. The AUV r2D4 cruised over the bottom of the gorge for about 6 hours at 3.3 knots and took side scan images of the bottom surface covering 25 km2. The images show that there is a flat wide lava plain, which is 26 km in length and has an average width of 2.7 km, i.e. 70 km2 in area. At the north part of the plain, there is a small rock mound. When r2D4 passed over the rocks, it found significant anomalies in the concentration of manganese and turbidity. Based on the results of the following Tow-yo survey, we came up with a conclusion that there is hydro-thermal activity at this location. It is concluded that based on a carefully-designed navigation plan the cruising type AUV can be a powerful tool for survey of mid-ocean ridge systems with complicated bottom topography." @default.
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- W2082535243 date "2007-06-01" @default.
- W2082535243 modified "2023-10-01" @default.
- W2082535243 title "Dives of AUV r2D4 to Rift Valley of Central Indian Mid-Ocean Ridge System" @default.
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- W2082535243 doi "https://doi.org/10.1109/oceanse.2007.4302392" @default.
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