Buoyancy: A Real-World Example

Doug Levin is the Associate Director for the Center for
Environment and Society at Washington College in Chestertown, Maryland,
and is an expert in underwater exploration technology, as well as
designing fun programs that teach complex engineering concepts.

Answer to last post’s thought question: How are submarines similar to drogues?

A surfaced submarine is positively buoyant. A diving submarine is negatively buoyant. A submarine staying still in the water column is neutrally buoyant. 

Below: Doug works on “Echo,” helping to get it back in the water after the tether was cut by the boat propeller.  The yellow parts of this device were made of dense, buoyant foam.


Doug_Post1_echo.jpgRemotely Operated Vehicles (ROVs) are devices used to explore the ocean. You might have seen them on TV a couple summers ago during the BP oil spill disaster taking video of the oil coming out of the broken pipe a mile deep in the Gulf of Mexico.  ROVs can cost several million dollars. On occasion, they get tangled in things that lie on the bottom of the ocean, lose power, or suffer cut cables. Losing ROVs in any of these ways is not a pleasant experience. 

While I was working in the Black Sea, the tow cable that connected us to our ROV was severed by our ship’s propeller.  There were a lot of nervous nellies on board that began scanning the water surface for our bright yellow device named “Echo.”  I went to the galley, got a cup of coffee, and went up to the boat bridge. This was the highest vantage point to keep an eye on the water surface. About twenty minutes later, “Echo” was spotted at the sea surface.  We retrieved her, spliced the tether back together, and re-launched her, continuing our operation.

Thought question: How would you design an ROV that had a good chance of being found if it failed completely?

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Meet Doug Levin: Geologist and Engineer

Doug Levin is the Associate Director for the Center for Environment and Society at Washington College in Chestertown, Maryland, and is an expert in underwater exploration technology, as well as designing fun programs that teach complex engineering concepts.

Doug-SIS-1000.jpgAs a kid growing up in Westport, Connecticut, I spent hours upon hours on the boat with my Dad. He would drive me crazy, gesturing at some point afar on the water’s surface exclaiming; “Can you see that? Nope, can’t see it. It’s underwater. (You) have to imagine it.”

Little did we both know that would become the phrase that shaped my future. After graduating from high school I went off to Fairleigh Dickinson University (FDU) in Madison, New Jersey, knowing that my last semester would be spent at their St. Croix, USVI campus. While at the St. Croix campus my life’s vocation changed when I took Tropical Marine Geology with Dr. Dennis Hubbard (Now at Oberlin College). He aptly demonstrated that by knowing geology, you could go anywhere in the world and look at a map, or out of the window of an airplane, and immediately see how that land was formed and was being shaped. “How cool is that,” I said to myself, and that was the beginning of my professional journey into Geology.

Doug-Little.jpgOne day I was in Dr. Hubbard’s office when his phone rang (yes, this was back in 1978). He picked it up and answered, “Dr. Hubbard, how can I help you?” When he hung up I said to him, “I’d like to answer my phone like that one day.” He said, “That would be fine, but you’d better use your own name!” 

From there I went up to Boston University and earned a Masters in Coastal Geology. From there, down south to Louisiana State University, where I earned my doctoral studying the coastline just west of the Mississippi River delta (how I went from BU down to LSU is another story that I’d be happy to tell in another post). Throughout my career I’ve worked as an academic, as a scientist in private industry, and as a federal employee of the National Oceanic and Atmospheric Administration.

Since the 80’s I’ve been lucky to be in the right place at the right time and get paid to join some really cool operations. My professional experience includes over thirty years of using devices (I consider them toys) that map the seafloor from the shallows to the very, very deep.  These include global positioning systems (GPS), multi-beam (bottom depth) side scan sonar, sub bottom profilers, Acoustic Doppler Current Profilers (ADCP), ROVs (Remotely Operated Vehicles), AUVs (Autonomous Underwater Vehicles), and magnetometers.

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