Sea Technology

JUL 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Map from the Franklin Volcano summit in Woodlark Basin, Papua New Guinea. We supply the best cranes – on time – for the best price 1123 St. Matthews Road Chester Springs, PA 19425 phone 610.827.2032 www.dmwmarinegroup.com 30 st / July 2013 to the ABYSS to obtain high-resolution bathymetric data on the landforms created by undersea eruptions. The data that the ABYSS provides allows a very detailed view of undersea landforms. The data that the ABYSS collects is at a much higher resolution than anything that can be generated using surface-ship bathymetric readings. Bathymetry has been measured from surface ships for centuries, but the so-called "wavelength handicap" limits the resolution of acoustic imaging from a surface ship in deep water. Acoustic penetration to 6,000-meter depths requires relatively low frequency (about 15 kilohertz), which corresponds to relatively long wavelength (about 10 centimeters) and poor resolution. An AUV fying about 10 meters above the seafoor enables high-frequency, high-resolution, shallow-water imaging technologies to be applied in deep water. Therefore, instruments onboard AUVs provide a level of detail that had previously been unattainable. Scientists at GEOMAR have thus observed seafoor volcanic landforms with unprecedented clarity, allowing them to gain deeper insight into the workings of undersea landforms and volcanoes and make direct comparisons with features they know from land. Having access to this extremely detailed information on the geological and chemical structure of the seafoor allows further understanding of the interrelations of volcanic activity, tectonic activity and hydrothermalism. The data has implications that extend across multiple disciplines, including how chemosynthetic life is distributed and the location of marine mineral resources. Onboard Equipment The ABYSS, like all REMUS 6000 AUVs manufactured by Hydroid, has several confguration options to meet a variety of mission requirements. Standard data collection instruments used on the ABYSS include an acoustic Doppler current profler, side scan sonar, pressure, altitude, conductivity and temperature sensors. Additional sensor options for Hydroid REMUS 6000-type AUVs include dual-frequency side www.sea-technology.com

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