Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures.
New methods and equipment for thickening and strengthening natural sea ice are needed to advance polar operational capabilities. Of the basic categories of techniques for inducing ice growth (ice injection, cold fluid injection, and recirculating fluid), one recirculation technique-the convection ce...
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ftdtic:AD0889704 2023-05-15T15:39:39+02:00 Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures. Culbertson, T. L. NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA 1971-10 text/html http://www.dtic.mil/docs/citations/AD0889704 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0889704 en eng http://www.dtic.mil/docs/citations/AD0889704 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Civil Engineering Structural Engineering and Building Technology (*SEA ICE FREEZING) (*STRUCTURES SEA ICE) ICE CRYSTAL GROWTH THICKNESS STABILITY CONVECTION(HEAT TRANSFER) SEA WATER ATMOSPHERIC TEMPERATURE SOLAR RADIATION ALASKA COASTAL REGIONS COLD WEATHER CONSTRUCTION ICE FORMATION *ICE CONSTRUCTION POINT BARROW Text 1971 ftdtic 2016-02-19T07:10:29Z New methods and equipment for thickening and strengthening natural sea ice are needed to advance polar operational capabilities. Of the basic categories of techniques for inducing ice growth (ice injection, cold fluid injection, and recirculating fluid), one recirculation technique-the convection cell-was found to best fulfill the requirements for polar applications. Other techniques imposed greater work or energy requirements. Two basic convection cell systems were laboratory tested: liquid convection and liquid-vapor phase convection. At a 30F air temperature, the Balch liquid convection cell produced 7.75 inches of ice in 90 hours while the Long liquid-vapor phase cell produced only 2 inches during the same time period. Because the liquid convection cell was found to be more effective at the mean polar air test temperatures than the two-phase cell, it was selected for field testing at Point Barrow, Alaska. The initial field tests at Point Barrow during the spring of 1969 demonstrated the excellent potential of the Balch-type liquid convection cell for thickening, stabilizing, and anchoring near-shore ice structures. Cells suspended in seawater produced ice along the entire submerged length; the production rate was dependent on the seawater temperature, the prevailing air temperature, and the thickness of the ice mass around the cell. In FY70 convection cells were used to form two grounded ice structures offshore at Point Barrow to permit study of their long-term stability. Laboratory research to improve cell performance and field application has resulted in the development of two new liquid convection cells: a simplified vertical convection cell and a horizontal convection cell. (Author) Text Barrow Ice permafrost Point Barrow Sea ice Alaska Defense Technical Information Center: DTIC Technical Reports database Balch ENVELOPE(-63.967,-63.967,-65.250,-65.250) Construction Point ENVELOPE(170.217,170.217,-72.317,-72.317) |
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 Structural Engineering and Building Technology (*SEA ICE FREEZING) (*STRUCTURES SEA ICE) ICE CRYSTAL GROWTH THICKNESS STABILITY CONVECTION(HEAT TRANSFER) SEA WATER ATMOSPHERIC TEMPERATURE SOLAR RADIATION ALASKA COASTAL REGIONS COLD WEATHER CONSTRUCTION ICE FORMATION *ICE CONSTRUCTION POINT BARROW |
spellingShingle |
Snow Ice and Permafrost Civil Engineering Structural Engineering and Building Technology (*SEA ICE FREEZING) (*STRUCTURES SEA ICE) ICE CRYSTAL GROWTH THICKNESS STABILITY CONVECTION(HEAT TRANSFER) SEA WATER ATMOSPHERIC TEMPERATURE SOLAR RADIATION ALASKA COASTAL REGIONS COLD WEATHER CONSTRUCTION ICE FORMATION *ICE CONSTRUCTION POINT BARROW Culbertson, T. L. Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures. |
topic_facet |
Snow Ice and Permafrost Civil Engineering Structural Engineering and Building Technology (*SEA ICE FREEZING) (*STRUCTURES SEA ICE) ICE CRYSTAL GROWTH THICKNESS STABILITY CONVECTION(HEAT TRANSFER) SEA WATER ATMOSPHERIC TEMPERATURE SOLAR RADIATION ALASKA COASTAL REGIONS COLD WEATHER CONSTRUCTION ICE FORMATION *ICE CONSTRUCTION POINT BARROW |
description |
New methods and equipment for thickening and strengthening natural sea ice are needed to advance polar operational capabilities. Of the basic categories of techniques for inducing ice growth (ice injection, cold fluid injection, and recirculating fluid), one recirculation technique-the convection cell-was found to best fulfill the requirements for polar applications. Other techniques imposed greater work or energy requirements. Two basic convection cell systems were laboratory tested: liquid convection and liquid-vapor phase convection. At a 30F air temperature, the Balch liquid convection cell produced 7.75 inches of ice in 90 hours while the Long liquid-vapor phase cell produced only 2 inches during the same time period. Because the liquid convection cell was found to be more effective at the mean polar air test temperatures than the two-phase cell, it was selected for field testing at Point Barrow, Alaska. The initial field tests at Point Barrow during the spring of 1969 demonstrated the excellent potential of the Balch-type liquid convection cell for thickening, stabilizing, and anchoring near-shore ice structures. Cells suspended in seawater produced ice along the entire submerged length; the production rate was dependent on the seawater temperature, the prevailing air temperature, and the thickness of the ice mass around the cell. In FY70 convection cells were used to form two grounded ice structures offshore at Point Barrow to permit study of their long-term stability. Laboratory research to improve cell performance and field application has resulted in the development of two new liquid convection cells: a simplified vertical convection cell and a horizontal convection cell. (Author) |
author2 |
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA |
format |
Text |
author |
Culbertson, T. L. |
author_facet |
Culbertson, T. L. |
author_sort |
Culbertson, T. L. |
title |
Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures. |
title_short |
Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures. |
title_full |
Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures. |
title_fullStr |
Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures. |
title_full_unstemmed |
Ice Construction--Bottom Freezing Techniques for Constructing Shore and Near-Shore Ice Structures. |
title_sort |
ice construction--bottom freezing techniques for constructing shore and near-shore ice structures. |
publishDate |
1971 |
url |
http://www.dtic.mil/docs/citations/AD0889704 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0889704 |
long_lat |
ENVELOPE(-63.967,-63.967,-65.250,-65.250) ENVELOPE(170.217,170.217,-72.317,-72.317) |
geographic |
Balch Construction Point |
geographic_facet |
Balch Construction Point |
genre |
Barrow Ice permafrost Point Barrow Sea ice Alaska |
genre_facet |
Barrow Ice permafrost Point Barrow Sea ice Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0889704 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766371650638446592 |