At least 1.5 million tons of debris from Japan’s 2011 tsunami is still afloat, and at least half of it is expected to hit Alaska’s coastline. The region from Yakutat to Gore Point off the Kenai Peninsula will likely see the heaviest debris piles, but Southeast Alaska and other areas will see chunks of junk as well.

Those are conclusions of a fascinating new report by Washington Sea Grant titled Debris Accumulation Scenarios in Washington State from the March 2011 Tohoku Tsunami. The Sea Grant report, authored by Ian Miller and Jim Brennan, says most of the debris should land within four years...