Reservoir Logs A submersible robot called the Sawfish can harvest healthy timber from long-forgotten underwater forests. Clear-cutting never looked so green.
By Michael BeharPage 1 of 3 next »
I’m standing on a steel barge in the center of Ootsa Lake, a 154-square-mile reservoir in northwestern British Columbia. A chafing wind blows from the west, where the snowy, nearly treeless slopes of the Kitimat Range vanish into overcast skies. I jump as a voice booms over the outdoor PA system: “Clear to cut!” A few seconds later, a massive spruce tree erupts from the murky water.
-SNIP-
you’re on the shoreline or live nearby, underwater timber harvesting is remarkably quiet: no screaming chain saws or smoke-belching heavy machinery. In a steady, splashing procession, tree after tree bobs to the surface, where a small tugboat rigged with a pair of hydraulic claws grabs the trunks and tows them into something called a bunk, a partly submerged U-shaped cradle. I can see three bunks from the barge. Each stores up to 300 trees and can be raised onto a second transport barge that holds up to 1,000 logs. The Sawfish and its four-person crew will fill it in just four days.
This unusual harvesting method is made possible by a submersible that can probe the deepest reservoirs for under-water trees to cut and deliver to the surface. It was developed by Chris Godsall, the 38-year-old founder and CEO of Triton Logging. The company is based near Victoria, but the principal underwater logging operation is at Ootsa Lake, almost 750 miles to the north. The lake was formed in 1954, when Alcan, the world’s second-largest aluminum producer, built a hydroelectric dam here to power its smelter. The water behind the dam flooded millions of lodgepole pine, spruce, Douglas fir, and hemlock trees, leaving some $1.2 billion worth of timber preserved in a kind of suspended animation. In the cold, dark, oxygen-poor water, tree wood won’t decay for thousands of years. And Ootsa is one of 45,000 spots around the globe where dams have inundated valleys and submerged vast forests. By some estimates, there is $50 billion worth of marketable timber at the bottom of these man-made lakes. Godsall is quick to point out that he has the only technology able to retrieve it.
To gather up a few logs, it might seem like lunacy to deploy the same kind of sophisticated and pricey ROVs used to explore the Titanic or investigate 9,000-foot-deep geothermal vents along the mid-Atlantic seafloor. But do the math and Godsall’s method starts to make good financial sense. Operated by just one person, a so-called feller buncher—the fastest and cheapest way to harvest timber on land—can cut at least 500 trees a day. But then it takes an additional three-member crew up to three weeks to trim and load the trees for transport. A single Sawfish is more efficient. It may clear only 250 trees in an eight-hour shift with four crew members, but there’s no need to skid the logs down a hillside and truck them to a mill. Instead, a barge delivers the trees to the mill faster and more cheaply, and because they’ve been submerged they’re generally already stripped of foliage and bark. A Sawfish, including the control room, tool shop, and power generator, costs $800,000 to $1 million, depending on the gadgetry packed into the ROV. That’s significantly less than the onetime equipment cost of roughly $1.5 million needed to run a comparable feller buncher operation. Add up all the numbers and, while conventional harvesting costs about $50 per cubic meter of wood, Peter Keyes, an executive at a global timber wholesaler and marketer, estimates Godsall’s cost at closer to $40. “Sure, there are big R&D costs to pay down,” Keyes says. “But the technology has given Godsall access to all these trees as if they were on land. It’s like finding a new penny.”
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http://www.wired.com/wired/archive/15.02/logs.html
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