Sea Technology

MAY 2013

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

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oceanresearch Burger Boat Co. to Build New Grayling for USGS The U.S. Geological Survey (USGS) awarded in April a contract for the construction of a large research vessel for Lakes Huron, Michigan and Superior to Burger Boat Co. of Manitowoc, Wisconsin.  The vessel will replace the 38-yearold Grayling, bringing the USGS Great Lakes Science Center (GLSC) large vessel feet up-to-date. The new Grayling will be stationed at the USGS base in Cheboygan, Michigan, and will come fully equipped with 21st-century laboratories and scientifc instrumentation to support fshery science for the Great Lakes.  The funding for this expenditure was accrued from two prior appropriations and held in an account unaffected by federal sequestration.  The replacement ship is expected to be a commercial grade 78-foot vessel, and will be designed and constructed for a 40-to-50-year service life. This vessel will be capable of performing critical scientifc and mission-related tasks, including dragging nets along the lake bottom, catching fsh, and using sound-waves to detect fsh and assess their abundance. JMS Naval Architects & Salvage Engineers of Mystic, Connecticut, developed the preliminary design of the new Grayling. The USGS GLSC maintains a feet of fshery research vessels on each of the Great Lakes to meet the scientifc research needs of state, tribal and federal resource managers for understanding and effectively managing the Great Lakes fshery. First Digital Map of Antarctic Seafoor Created An international team of scientists led by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research has for the frst time created a digital map of the entire Antarctic seafoor. The International Bathymetric Chart of the Southern Ocean (IBCSO) shows the detailed topography of the seafoor for the entire area below 60o South. The IBCSO data grid and the corresponding Antarctic chart are available at www.ibcso.org and are intended to improve understanding and prediction of sea currents, geological processes or the behavior of marine life. Scientists from 15 countries and more than 30 research institutions brought together their bathymetric data from nautical expeditions. The data set comprised some 4.2 billion individual values, and the scientists interpolated the data set, too. As a result, the IBCSO data grid has a resolution of 500-times500-meters. This means that one data point refects the depth of a sea area of 500-times-500-meters. Where older models only offer a glimpse of a mountain in the deep sea, IBCSO shows an elevation with sharp ridge crests and deep channels in the slopes. A formerly fat point at the bottom of the Riiser-Larsen Sea can now be identifed as a 300-meter-deep offshoot of the underwater Ritscher Canyon which runs more than 100 kilometers from the southwest to the north. More than 80 percent of the area of the South Polar Sea is still unchartered. A Special Thanks to All of Our Sponsors! 12T 12TH Annual MATE International ROV Competition Ocean Observing Systems: Launching a New Era of Ocean Science & Discovery Highlighting the role that ROVs play in the installation, operation, and maintenance of regional cabled ocean observing systems ® University of Washington Weyerhaeuser Weye Weye hae ser King County Aquatic Center Feder W y Washington June 20-22 2013 We rhaeuser Kin Co nty Aqu tic Cen Wey rhaeuser Ki g C unty Aq atic Center Fede Weyerhaeuser King County Aquatic Centerr | Federall Way, Washington | June 20-22,, 2013 n nty qu ent Fed Federal Way, Washington June 20-22, 20 de dera Way Way, hington t 22, 22 2013 2 72 st / MAY 2013 | www.materover.org ww mat rov r o g www.materover.org ww .materover.org www.materover.org ov v www.sea-technology.com

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