Author(s): Shinji Nishizawa; Sachito Tanaka

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Abstract: The shoreline area near the Okhotsk coastal fisheries in Japan has been severely damaged from drifting ice once every several years. Recently, the construction of an ice barrier was begun. A stable structure, easily installed which can be readily moved or adjusted and which will provide minimum obstruction to the tidal current is now considered more important than ever. In this technical paper, a new type ice barrier is introduced that can be more easily positioned and which is more economical in cost than other types. This type has been designed based on the results of our experiments with ice. The structure is composed of connected pipes which are filled with "heavy" concrete and three main inclined pipes connected to them at the top. The main pipe sections which are fabricated in triangular shape are positioned on the seabed. Sea ice has a low flexural strength compared with its compressive strength, and therefore the inclined pipes are only loaded with a small ice force compared with the vertical pipes. The design takes into account wave forces, horizontal forces and vertical forces due to the bending distortion of the ice and "ice-jamming" phenomenon. These features make it possible to develop a structure which can be easily located, is economical in cost, and which provides minimum obstruction to the tidal current.

DOI:

Year: 1988