MIT researchers have used a sonar imaging system to observe a “colossal congregation of cod consume over 10 million capelin,” reports Mark Kaufman for Mashable. This event “was the largest predation event ever documented in the ocean,” writes Kaufman.
Using a sonar-based technique called Ocean Acoustic Waveguide Remote Sensing (OAWRS), researchers at MIT and elsewhere have tracked a swarm of cod off the coast of Norway eating millions of migrating capelin fish, reports Ed Cara for Gizmodo. Cara notes that in the future this technique could potentially allow “researchers and others to more easily monitor the health of these important fish and other life in marine ecosystems.”
Scientists from MIT and elsewhere are using submersible structures to harness the power of ocean waves and make sand accumulate in specific regions to protect islands and potentially grow new ones, reports Amy Gunia for CNN. “With each field experiment, the group says it is advancing its understanding of what materials, configurations, and construction techniques can make sand accumulate in the simplest, most cost-effective, sustainable, long-lasting and scalable way,” explains Gunia.
Researchers from MIT have developed “sustainable, offshore, hydrodynamic,” artificial reef structures capable of dissipating “more than 95% of an incoming wave’s total energy,” reports Nick Warburton for Materials World. The design “comprises vertical cylinders with four rudder-like slats attached to them, so that water can flow through the structure to generate 'swirling masses of water' or large eddies,” explains Warburton.
MIT scientists are working to fortify coastlines with “architected” reefs that can also provide habitats for fish and marine life, reports Ed Brown for TechBriefs. “We looked at the structure of these reefs and we found some similarities to what we had been doing in fluid mechanics. That led us to the idea of trying to make artificial reefs that we could architect and build in a very directed way,” says Prof. Michael Triantafyllou.
MIT researchers have found that a textured surface, designed like a shark riblet, can improve the towed sonar arrays (TSAs) that are "vital for marine vessels engaged in underwater security or exploration projects," reports Andrew Paul for Popular Science. “Utilizing computational modeling, researchers tested various riblet shapes and patterns interacting with simulated water environments,” explains Paul. “From calm currents to the more commonly unpredictable flows seen in oceans, the team observed how smooth, triangular, trapezoidal, and scalloped riblets might affect fluid dynamics and acoustics.”
Prof. Nicholas Makris speaks with USA Today reporter Phaedra Trethan about the oceanic challenges that may impact the search for Amelia Earhart and Fred Noonan’s plane. The plane "is lost in the darkens of the ocean,” says Makris. “The sound (from sonar equipment) takes the darkness out, but it’s so far down that, from the surface, it can look like a speck.”
Popular Science reporter Andrew Paul writes that MIT researchers have developed a new long-range, low-power underwater communication system. Installing underwater communication networks “could help continuously measure a variety of oceanic datasets such as pressure, CO2, and temperature to refine climate change modeling,” writes Paul, “as well as analyze the efficacy of certain carbon capture technologies.”
MIT researchers have developed a new two-step electrochemical process to remove carbon dioxide out of seawater, reports John Fialka for E&E News. The new approach “cuts energy costs and expensive membranes used to collect CO2 to the point where merchant ships that run on diesel power could collect enough CO2 to offset their emissions,” Fialka writes.
Researchers at MIT developed SoFi, a soft robotic fish designed to study underwater organisms and their environments, reports Mashable. “The soft robotic fish serves a nice purpose for hopefully minimizing impact on the environments that we’re studying and also helps us study different types of behaviors and also study the actual mechanics of these organisms as well,” says graduate student Levi Cai.
Prof. Fadel Adib speaks with CBC Radio about his lab’s work developing a wireless, battery-free underwater camera that runs on sound waves. "We want to be able to use them to monitor, for example, underwater currents, because these are highly related to what impacts the climate," says Adib. "Or even underwater corals, seeing how they are being impacted by climate change and how potentially intervention to mitigate climate change is helping them recover."
Prof. Wanying Kang and her colleagues have found that “the way ice covers the surface of Saturn’s moon Enceladus suggests that the oceans trapped beneath it may be only a little less salty than Earth’s oceans,” reports By Karmela Padavic-Callaghan for New Scientist. “The researchers found that saltier subsurface oceans correspond to thicker ice on a planet’s poles than over its equator and vice versa for less salty water,” writes Padavic-Callaghan.
A campaign led by RRS Discovery, and Prof. Raffaele Ferrari has found that deep-ocean water rises due to the turbulence created by undersea mountains, reports Paul Voosen for Science. “The turbulence that was found tended to grow with depth. Like a spoon stirring milk into coffee, it was driving water down, not up, says Ferrari,” writes Voosen.
Researchers from MIT and Princeton University have found that flooding events will become much more common by the end of the century, especially in New England, reports Evan Bush for NBC. “The researchers used computer modeling to stimulate thousands of ‘synthetic’ hurricanes toward the end of this century and in a scenario where greenhouse gas emissions are very high,” writes Bush.
National Geographic reporter Sadie Dingfelder writes that MIT scientists are using piezoelectric materials to develop a battery-free, underwater navigation system. “There are a lot of potential applications,” says Prof. Fadel Adib. “For instance, a scuba diver could use these sensors to figure out the exact place they took a particular picture.”