Abstract
Numerous pipe-framed greenhouses (referred to as “pipe houses” hereafter) were damaged by the 2011 Earthquake and Tsunami off the Pacifi c Coast of Tohoku and Kanto districts. We surveyed damaged pipe houses in Miyagi Prefecture and classifi ed the damage characteristics from the Tsunami. Near the Pacifi c coast, the strength of pipe houses could not withstand the Tsunami forces acting on them. At locations several km inland from the coast, pipe houses would be destroyed by the force of the Tsunami driven water and debris where they were not constructed in an area protected by some energy dissipaters such as an embankment. Where the energy dissipaters provide suffi cient protection or the static water pressure on the side of pipe house is eliminated, pipe house failure is avoided. Pipe house showing water marks at levels up to 160 cm in height did not collapse as long as water was able to enter inside the pipe house immediately. This concept can also be applied to the measure of fl ooding in other areas. Where measurements for salt injury and contamination of soil by the marine sludge sedimentation, which include heavy metals, are high, high-bench cultivation is one of the most effective options for production.
