Manasan Ice Control Structure Rehabilitation & Bypass Designsby Fred E. Parkinson, LaSalle Hydraulic Lab, LaSalle, Canada,
Philip D. Wang, LaSalle Hydraulic Lab, LaSalle, Canada,
Abstract: Ice control works built on the Burntwood River at Manasan Falls were damaged during the 1985 spring break-up. The ice boom had broken and the lowered pond level indicated that the rockfill groins and/or the bottom paving had also been modified. Field surveys defined the damage underwater zones, and a physical scale model reproduced the flow conditions. Procedures were developed on the model to rehabilitate the works. The next phase of development on the Burntwood River required excavation of a bypass channel for flood flows greater than the capacity of the gap between the groins. The same physical model was used to refine the proposed bypass design. After repairs to the ice boom, the rehabilitation was completed in 1986 and the bypass channel was constructed in 1988/89. The new control works have operated as forecast over the winter seasons since their completion.
Subject Headings: Ice | Rehabilitation | Physical models | Scale models | Rivers and streams | Groins (structure) | Underwater surveys
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