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PAULUHN ELECTRIC MFG. CO., INC. P. O. BOX 12805 HOUSTON, TEXAS 77017 (713)485-4311 Raytheon And University Scientists Form Team To Study Continental Shelf The ecological impact of offshore dredging of sand, gravel and aggregates, lying on the contin- ental shelf will be assessed in a study program soon to get under way off the New England Coast. Scientists from Raytheon Company and the University of New Hampshire working together have completed the first phase of the program in which they are seeking to develop acoustic tech- niques to enable observers aboard ship to identify and classify layers of sediment on the ocean floor. Continuing experiments will advance their studies to determine remotely the load-bearing strengths of these sediments from their surface observations. The first joint industry-university project to be funded under the Sea Grant Act, the study of the technology involved in the management of bottom resources of the continental shelf, is now in its second year. The project is supported by the Na- tional Oceanic and Atmospheric Administration's Sea Grant Office. In the initial studies, methods were developed for studying and understanding the dynamic behaviors of acoustic probe signals as they are absorbed and reflected by sediments on the ocean floor. Rela- tionships between mechanical and acoustical prop- erties of soil are of particular interest. From these studies, it is possible to correlate physical ocean bottom and sub-bottom character- istics with acoustic measurements. These measure- ments can now be analyzed for information on sediment of increasing depths. Gathering samples and associated acoustic pro- filing were done in Narragansett Bay. Bottom samples were collected using both a small dredge and a Shipek grab-sample, a device containing a spring loaded bucket that snaps closed upon strik- ing the bottom. A Benthos gravity corer was used to take core samples five feet below the bottom. 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Capable of obtaining sedi- mentary cores as deep as 24 feet, this UNH- developed device applied a vibratory force to the steel core driving tube. Bottom samples compatible with sub-bottom depths reached by acoustic probes were obtained. The Narragansett Bay studies were conducted by Raytheon Company's Submarine Signal Divi- sion using its oceanographic research vessel. Acoustic echoes collected on a multi-channel, wide dynamic range tape recorder were processed on digital computers, including a Raytheon Data Systems Company Model 520. Because of the increasing interest in the ecologi- cal impact of offshore sediment removal, the fu- ture phases of the program will include studies of plant and animal communities at the dredge site, before, during, and after dredging activities. Further information on the project may be ob- tained from the Ocean Systems Center, Raytheon Company, Portsmouth, R.I., or the Department of Mechanical Engineering, University of New Hampshire, Durham, N.H. 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