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Freezeup Ice Jam Control on the Deschutes River at Bend, OR: Ice Boom Design Criteria Re‐Examined
ASCE Conf. Proc. doi:http://dx.doi.org/10.1061/40792(173)244
Impacts of Global Climate Change
Proceedings of World Water and Environmental Resources Congress 2005
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Add to FacebookThis study investigated the effectiveness of an ice boom installed on the Deschutes River in Bend, Oregon in 1987. The boom was built following a severe freezeup ice jam in December 1983 that flooded 110 homes with total damages of $900,000. Since 1987, the Deschutes River at Bend has seen many changes, placing the ice boom's effectiveness in doubt. This study determined if, under current conditions, the ice boom retained sufficient frazil ice to prevent downstream ice jam flooding. The study also examined other ice control options, such as raising the water level at a dam downstream of the boom and dredging to reduce water velocity and improve frazil ice capture at the boom. Moving the boom to a more favorable location and reconfiguring the boom were also investigated. Study results suggest that the conventional ice boom performance criteria of surface water velocity ≤ 0.7 m/s and Froude number ≤ 0.08 may be un‐conservative for predicting frazil ice capture. The study also found that, when using calculated average channel velocity to evaluate the ice retention capacity of a boom, variations in the vertical and horizontal water velocity profiles can be very important.
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