Sea Technology

JUL 2017

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www.sea-technology.com July 2017 / st 49 www.geospace.com Manufacturing Cables That Meet Your Requirements For Over 30 Years 7007 Pinemont Houston, TX 77040 USA 713.986.4477 NEED CABLE? Waln noticed that a dolphin's dorsal fin is like an upside-down sailboat keel and that a process similar to the one used to assign racing handicaps to boats could be applied to dolphins. Framing assigns numerical charac- teristics to each dolphin fin, taking into account the aspect ratio, sweep, con- tour and the position of damage to the fin. The data go through a Microsoft Excel algorithm, which supplies the names of dolphins who match all mea- surements. Framing provides the most likely dolphin match candidates in 4 to 6 minutes instead of hours. The team is working to complete at least 250 samples before expanding the project. Acoustic Emissions Can Monitor Mooring Rope Condition Cohort company SEA is supporting the University of Exeter on a research project on how acoustic emissions (AE) signatures can be used to monitor the condition of synthetic mooring ropes widely used in securing floating off- shore structures. The research investigates using AE signatures to assess the degradation of mooring lines by subjecting the ropes to sinusoidal tension loading in a con- trolled environment, using a large- scale dynamic tensile test rig. The main findings are that the fail- ure location and breaking load can be identified through the detection of AE. The occurrence of high-amplitude AE bursts in relation to the applied tensile load allows the detection of an immi- nent failure, compared to most existing monitoring techniques that can detect the failure but not the degradation of mooring lines. Using AE for remote monitoring could become an attractive and less costly option than using sub- mersible vehicles. Scripps Center for Marine Archaeology Launches Scripps Institution of Oceanography and the Department of Anthropology have joined efforts within the Univer- sity of California San Diego to launch the Scripps Center for Marine Archae- ology (SCMA). Researchers will con- duct field work at key underwater and coastal archaeological sites around the world, studying the influence of ma- rine environments on human cultures. SCMA will explore human societ- ies in coastal zones and adaptation processes to climate and environmen- tal changes. Over the next two years, the center plans to launch a series of research projects in the eastern Medi- terranean, southern Peru, Puerto Rico, Belize and along the California coast. Acidifying Water Could Slow Black Band Disease New research suggests ocean acidi- fication could slow some coral diseas- es. A controlled lab study led by Mote Marine Laboratory revealed that black band disease was less deadly to moun- tainous star coral (Orbicella faveolata) as water acidified. Ocean acidification may weaken or dissolve corals' hard skeletons. Warming water stresses cor- als, causing them to lose the vital al- gae in their tissues. Coral diseases may worsen in corals stressed by warming water temperatures. The new study is the first to examine how low-pH water affects black band—a fast-progressing, often deadly worldwide coral disease. Black band affects species including mountainous star coral, a major con- tributor to the reef system of the Florida Keys that is listed as threatened under the U.S. Endangered Species Act. ST

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