摘要: One of the major obstacles to be overcome in extending the navigation season on the Saint Marys River was to develop methods to mitigate ice problems in and around the Soo Locks. The two major ice problems encountered were ice acc... 展开 One of the major obstacles to be overcome in extending the navigation season on the Saint Marys River was to develop methods to mitigate ice problems in and around the Soo Locks. The two major ice problems encountered were ice accumulations on lock walls which reduced the useable width of the lock, and large quantities of brash ice entering the lock from upstream that could hinder operation of the miter gates and interfere with ships entering the lock. During the program a variety of concepts were examined, including: lock operating procedures, heating the lock walls, and high volume air bubblers (screens) to control floating ice. The air screen system demonstrated during the Program largely solves the floating ice problem by diverting the brash ice from the lock and its approach, and also reduces the quantities of ice available to accumulate on the lock walls and gates. A chemical, ice-released coating was also developed which further reduced the problem of ice accumulation on lock walls. Keywords: Sediment transport, Shoreline erosion and shore structure damage, Oil and hazardous substance spills, Biological effects, Ship-induced vibrations, Bubbler systems. (kr) 收起