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SUMMARY:River Ice Breakup - Steven Daly (United States Army Corps of Engin
 eers (USACE))
DTSTART:20171206T090000Z
DTEND:20171206T100000Z
UID:TALK96289@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Breakup transforms an ice-covered river into an open river. Tw
 o ideal forms of breakup bracket the types of breakup commonly found throu
 ghout most of the globe. At one extreme is thermal breakup. During an idea
 l thermal breakup\, the river ice cover deteriorates and melts in place\, 
 with no increase in flow and little or no ice movement. At the other extre
 me is the more complex and less understood mechanical breakup (also referr
 ed to as a dynamic breakup). Mechanical breakup requires no deterioration 
 of the ice cover\, but rather results from an increase in flow entering th
 e river. The increase in flow induces stresses in the cover\, and the stre
 sses in turn cause cracks and the ultimate fragmentation of the ice cover 
 into pieces that are carried by the channel flow. Ice jams take place at l
 ocations where the ice fragments stop\; severe and sudden hydraulic transi
 ents can result when these ice jams form or when they release. This presen
 tation will focus on mechanical breakup and the historical evolution of ou
 r understanding of this topic. The presentation will include discussions o
 f ice cover formation and the typical resulting ice structure\, wave-ice i
 nteraction\, the physics of the cracking\, and the current status of our u
 nderstanding of breakup.
LOCATION:Seminar Room 1\, Newton Institute
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