Author(s): Elena Pummer; Brian Crookston
Linked Author(s): Brian Crookston, Elena Pummer
Keywords: No Keywords
Abstract: This study examines how ice blocks formed from fractured sheet ice may collect on the crest of labyrinth weirs in cold regions and how such blockages may affect hydraulic performance. Based upon field observations, scale-model tests with varying idealized ice block shapes, sizes, and thicknesses were studied for typical river flow conditions. Results indicate that ice geometry and flow conditions at the crest (flow depth, local velocity) strongly influence passage behavior. Thicker ice blocks tend to pass only at higher discharges, while thinner and smaller blocks pass more easily. Experimental results include locations of ice block accumulation on the crest and, if blocks passed over the weir, were they likely to be transported downstream or accumulate within the outlet cycles. Furthermore, even partial ice block accumulation on the labyrinth crest noticeably reduced discharge efficiently, highlighting the need to consider ice effects in the design and winter operation of labyrinth weirs.
Year: 2026