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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ftdtic:ADA235724 2023-05-15T16:37:05+02:00 Frazil Ice Blockage of Intake Trash Racks Daly, Steven F. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 1991-03 text/html http://www.dtic.mil/docs/citations/ADA235724 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA235724 en eng http://www.dtic.mil/docs/citations/ADA235724 Approved for public release; distribution is unlimited. DTIC AND NTIS 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 Text 1991 ftdtic 2016-02-22T19:37:02Z 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. Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
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 |
spellingShingle |
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 Daly, Steven F. Frazil Ice Blockage of Intake Trash Racks |
topic_facet |
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 |
description |
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. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
Daly, Steven F. |
author_facet |
Daly, Steven F. |
author_sort |
Daly, Steven F. |
title |
Frazil Ice Blockage of Intake Trash Racks |
title_short |
Frazil Ice Blockage of Intake Trash Racks |
title_full |
Frazil Ice Blockage of Intake Trash Racks |
title_fullStr |
Frazil Ice Blockage of Intake Trash Racks |
title_full_unstemmed |
Frazil Ice Blockage of Intake Trash Racks |
title_sort |
frazil ice blockage of intake trash racks |
publishDate |
1991 |
url |
http://www.dtic.mil/docs/citations/ADA235724 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA235724 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA235724 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766027386419150848 |