Frazil Ice Blockage of Intake Trash Racks

Operating water intakes in lakes and rivers in northern regions is complicated by the presence of ice. One of the most difficult problems is the accumulation of frazil ice on the intake trash rack, which can completely block the trash rack and rapidly and unexpectedly shut down the intake facility....

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Bibliographic Details
Main Author: Daly, Steven F.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1991
Subjects:
Snow
Ice and Permafrost
Civil Engineering
*LAKES
*RIVERS
*ICE FORMATION
*INLETS
ICE
NIGHT
BLOCKING
ACCUMULATION
GEOGRAPHIC AREAS
COLD WEATHER
SOLID WASTES
SUPERCOOLING
STORAGE RACKS
NORTHERN HEMISPHERE
PRODUCTION
REMOVAL
FLUSHING
MECHANICAL PROPERTIES
VIBRATION
*FRAZIL ICE
*RIVER ICE
*LAKE ICE
*TRASH RACKS
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA235724
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA235724
Description
Summary:Operating water intakes in lakes and rivers in northern regions is complicated by the presence of ice. One of the most difficult problems is the accumulation of frazil ice on the intake trash rack, which can completely block the trash rack and rapidly and unexpectedly shut down the intake facility. In extreme cases the blockage can cause the intake trash rack to collapse. Blockages of intake trash racks occur sporadically, most often at night, in cold weather and always underwater. As a result, opportunities for observation and measurement are limited. This report discusses the following topics: The blockage process in rivers and in lakes; Coping with frazil blockage; Suppressing frazil production by using heat; Mechanical removal; Back flushing, Vibration; Blasting; Removal of trash racks; and Operating under frazil conditions.

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