Modeling Ice Passage Through an Auxiliary Lock Chamber with a Submergible Lift Gate

River ice from the Des Moines and Fox Rivers combines with that of the Mississippi during spring breakup, resulting in massive ice accumulations upstream of Lock and Dam 20 on the Mississippi River. The accumulations in the upper lock approach area cause considerable delays to navigation, as ice mus...

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Bibliographic Details
Main Authors: Zufelt, Jon, Rand, John, Gooch, Gordon
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1993
Subjects:
Ice
Online Access:http://www.dtic.mil/docs/citations/ADA268702
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA268702
Description
Summary:River ice from the Des Moines and Fox Rivers combines with that of the Mississippi during spring breakup, resulting in massive ice accumulations upstream of Lock and Dam 20 on the Mississippi River. The accumulations in the upper lock approach area cause considerable delays to navigation, as ice must be passed through the lock chamber to clear the approach. A physical model study was conducted to determine the effects of using the existing auxiliary lock chamber to pass ice. The auxiliary lock chamber was fitted with a submergible lift gate at its upstream end that could be lowered to pass ice and clear the upperlock approach area. Model tests were conducted with real and plastic ice material to simulate the brash ice conditions encountered during low-flow prototype winter conditions. The submergible lift gate worked well in clearing ice accumulations from the upper lock approach. It was necessary to disturb the accumulation and keep it from refreezing by simulating towboat movement or high volume point source air bubblers to thoroughly clear the approach area. Auxiliary lock chamber, Navigation lock, River transportation, Ice passage, Physical model, Submergible lift gate, River ice.