Author(s): Roscoe E. Perham
Linked Author(s):
Keywords: No Keywords
Abstract: The concept of using a trash-rack-like fence across a river to form an overflow weir by accumulating frazil ice was studied. The main purpose of the structure is to create an upstream pool on which a smooth ice cover can form. Laboratory tests in a refrigerated flume provided structural stability guidance and some frazil accumulation experience, with the latter being somewhat inconclusive. Field tests were conducted using a 19-m-long by 1.22-m-high fence boom across two approximately 17-m-wide rivers, one in New Hampshire and one in Vermont. Stream bank anchors were used at both sites and the river bed was not prepared in any way. In due time, frazil ice accumulations on the boom blocked the flow and had the desired effect of developing 1.7-m-deep pools. The basic concept worked quite well but an armored stream bed and armored banks are necessary. Further tests, especially of a series of units, are recommended.
Year: 1986