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Title: Forces generated in ice boom structures
Authors: United States. Army. Corps of Engineers. Detroit District.
Perham, Roscoe E.
Keywords: Ice
Lake ice
River ice
Ice booms
Ice control
Ice breaking
Ice force measurements
St. Lawrence Seaway
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 200.
Description: Special Report
Abstract: Two ice booms in the international section of the St. Lawrence Seaway, near Ogdensburg, New York, were instrumented for measuring ice forces in the winter of 1972-73. These ice booms are among several installed annually by the United States and Canada primarily to prevent ice jams from forming and severely restricting water flows. As presently used, they act as barriers to the navigation of ships. Measurements were initiated at a shore anchor site. The system used for these measurements consisted of a commercial tension cell, located in a new line spliced to the anchor rope, which provided electrical signals to a strip chart recorder that operated continuously. A second system consisted primarily of two special tension cells, an armored signal cable, a direct conversion electric generator, and a recorder. This system was used to measure two concurrent forces at a midstream location where high loads were expected. Additional information on such influencial factors as water velocity, ice thickness, wind conditions and air temperature was also obtained. The winter of 1972-73 was quite mild for ice conditions. The forces measured in the shore anchor were very low: 6 tons during the January thaw and 8 tons at spring breakup. A load of 24 tons was registered in January at the mid-stream site; however, the spring readings were not obtained. The 24-ton load occurred in the boom rope and not in the river bottom anchor rope as had been originally expected. This anomaly could occur only if the anchor had earlier moved downstream an excessive distance. Other effects showed that the ice booms underwent harsh treatment from ice action even at relatively light loads. Continuation of this monitoring program is planned for the 1973-74 winter season.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Special Report

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