A Model for Vertical Frazil Distribution
A model is presented for the evolution of frazil over depth and with time in a turbulent flow. The net upward migration due to buoyancy of the frazil is opposed by intermittent mixing induced by large energy-containing eddies. A surface renewal model is used to describe the effects of large eddy mix...
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ftdtic:ADA251519 2023-05-15T16:37:26+02:00 A Model for Vertical Frazil Distribution Liou, Chyr P. Ferrick, Michael G. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 1992-04 text/html http://www.dtic.mil/docs/citations/ADA251519 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA251519 en eng http://www.dtic.mil/docs/citations/ADA251519 Approved for public release; distribution is unlimited. DTIC AND NTIS Snow Ice and Permafrost Fluid Mechanics *MATHEMATICAL MODELS *TURBULENT FLOW *ICE FORMATION FREQUENCY FUNCTIONS DENSITY THICKNESS MODELS DEPTH HEAT FLOW TRANSITIONS MIXING MIGRATION ICE PROFILES SURFACES TIME NETS HEAT LOSS BUOYANCY BODIES PROBABILITY DENSITY FUNCTIONS DISTRIBUTION LAYERS PARAMETERS PROBABILITY ENERGY RATES AST24 FRAZIL ICE PE61102A WU001 Text 1992 ftdtic 2016-02-22T14:50:16Z A model is presented for the evolution of frazil over depth and with time in a turbulent flow. The net upward migration due to buoyancy of the frazil is opposed by intermittent mixing induced by large energy-containing eddies. A surface renewal model is used to describe the effects of large eddy mixing. Parameters that represent an entire water body are obtained by averaging those of discrete water columns using a probability density function. These parameters include the concentration profile, the surface age, and the surface layer thickness. A dimensionless surface renewal frequency characterizes the frazil distribution at equilibrium. The rate of heat loss from the water surface, the surface renewal frequency, and the critical surface layer thickness determine whether the frazil will evolve toward a well-mixed equilibrium state or a layered state. The model provides a physical basis for understanding the transition between these states, consistent with existing empirical criteria and field data. 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 Fluid Mechanics *MATHEMATICAL MODELS *TURBULENT FLOW *ICE FORMATION FREQUENCY FUNCTIONS DENSITY THICKNESS MODELS DEPTH HEAT FLOW TRANSITIONS MIXING MIGRATION ICE PROFILES SURFACES TIME NETS HEAT LOSS BUOYANCY BODIES PROBABILITY DENSITY FUNCTIONS DISTRIBUTION LAYERS PARAMETERS PROBABILITY ENERGY RATES AST24 FRAZIL ICE PE61102A WU001 |
spellingShingle |
Snow Ice and Permafrost Fluid Mechanics *MATHEMATICAL MODELS *TURBULENT FLOW *ICE FORMATION FREQUENCY FUNCTIONS DENSITY THICKNESS MODELS DEPTH HEAT FLOW TRANSITIONS MIXING MIGRATION ICE PROFILES SURFACES TIME NETS HEAT LOSS BUOYANCY BODIES PROBABILITY DENSITY FUNCTIONS DISTRIBUTION LAYERS PARAMETERS PROBABILITY ENERGY RATES AST24 FRAZIL ICE PE61102A WU001 Liou, Chyr P. Ferrick, Michael G. A Model for Vertical Frazil Distribution |
topic_facet |
Snow Ice and Permafrost Fluid Mechanics *MATHEMATICAL MODELS *TURBULENT FLOW *ICE FORMATION FREQUENCY FUNCTIONS DENSITY THICKNESS MODELS DEPTH HEAT FLOW TRANSITIONS MIXING MIGRATION ICE PROFILES SURFACES TIME NETS HEAT LOSS BUOYANCY BODIES PROBABILITY DENSITY FUNCTIONS DISTRIBUTION LAYERS PARAMETERS PROBABILITY ENERGY RATES AST24 FRAZIL ICE PE61102A WU001 |
description |
A model is presented for the evolution of frazil over depth and with time in a turbulent flow. The net upward migration due to buoyancy of the frazil is opposed by intermittent mixing induced by large energy-containing eddies. A surface renewal model is used to describe the effects of large eddy mixing. Parameters that represent an entire water body are obtained by averaging those of discrete water columns using a probability density function. These parameters include the concentration profile, the surface age, and the surface layer thickness. A dimensionless surface renewal frequency characterizes the frazil distribution at equilibrium. The rate of heat loss from the water surface, the surface renewal frequency, and the critical surface layer thickness determine whether the frazil will evolve toward a well-mixed equilibrium state or a layered state. The model provides a physical basis for understanding the transition between these states, consistent with existing empirical criteria and field data. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
Liou, Chyr P. Ferrick, Michael G. |
author_facet |
Liou, Chyr P. Ferrick, Michael G. |
author_sort |
Liou, Chyr P. |
title |
A Model for Vertical Frazil Distribution |
title_short |
A Model for Vertical Frazil Distribution |
title_full |
A Model for Vertical Frazil Distribution |
title_fullStr |
A Model for Vertical Frazil Distribution |
title_full_unstemmed |
A Model for Vertical Frazil Distribution |
title_sort |
model for vertical frazil distribution |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADA251519 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA251519 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA251519 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766027721887973376 |