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The RV INVESTIGATOR is a quiet research vessel that has recently been built for CSIRO, the Australian Commonwealth Scientific and Industrial Research Organization. The vessel has stringent noise and vibration criteria, particularly with respect to underwater noise. Significant efforts were required in order for the vessel to be properly designed, constructed, and tested. This paper describes the efforts...
Pile driving with an impact hammer is inherently a transient process and can produce very high sound levels. It is shown that the underwater noise during pile driving is due to a radial expansion of the pile that propagates along the pile after impact. This structural wave produces a wave front cone in the water, and a downward moving wave that continues into the sediment. An upward moving wave front...
Understanding the types of noise generated by a small boat is important for ensuring that marine ecosystems are protected from detrimental anthropogenic noise. Here we present the results of a field test conducted to examine the effects of engine RPM, number of engines and number of propeller blades on the broadband and narrowband noise produced by a small boat. The test boat was a 23-foot aluminum-hulled...
After several years of maturation of wave energy concepts and technologies some developers have finally reached a pre-mature phase. Over the course of this progress some concern has arisen regarding possible environmental impacts, however due to the limited number of devices tested in real sea conditions the few environmental studies available seldom resort to field data. Preliminary studies of wave...
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