Curt Ebbesmeyer says how fast the flotsam arrives depends on the material. A derelict vessel could take 12 months, while a rubber ducky may take two to three years.

He says the floating debris will likely flow in a big circle, carried by currents from Japan to Washington, Oregon and British Columbia before turning toward Hawaii and back toward Asia.

Most of the debris will be plastic items. Heavier items like cars will sink.

Ebbesmeyer and another scientist have been mapping the path of ocean debris for years and he wrote a book about the research.