Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont
Sections in the Connecticut River where ice jam potential is high were identified through the use of low-altitude black and white photographs taken during low-flow, ice-free conditions. The hydraulics and mechanics of ice jam initiation were investigated in the river reach where these sections were...
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ftdtic:ADA031572 2023-05-15T16:37:15+02:00 Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont Calkins,D J Hutton,M S Marlar,T L COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H 1976-09 text/html http://www.dtic.mil/docs/citations/ADA031572 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA031572 en eng http://www.dtic.mil/docs/citations/ADA031572 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Hydrology Limnology and Potamology Snow Ice and Permafrost *HYDROLOGY *ICE *AERIAL PHOTOGRAPHS *CONNECTICUT RIVER POSITION(LOCATION) THICKNESS SHALLOW WATER BARRIERS VERMONT CHANNELS(WATERWAYS) LOW ALTITUDE River ice Ice jams Windsor(Vermont) Ice floes Froude number Brattleboro dam Backwater Bridge piers Wilder dam Text 1976 ftdtic 2016-02-20T11:39:31Z Sections in the Connecticut River where ice jam potential is high were identified through the use of low-altitude black and white photographs taken during low-flow, ice-free conditions. The hydraulics and mechanics of ice jam initiation were investigated in the river reach where these sections were identified. Certain areas were found in the river that had a high susceptibility to ice clogging, but this high potential decreased with increasing discharge because of the improved surface conveyance of the ice through the reach. The stability of ice floes was established along the channel, but the floes generally became unstable as the flow increased. This was calculated by using a Froude number criterion. Grounding locations for ice became evident when the critical Froude number was zero for a given thickness and water depth. No single factor was determined to be responsible for initiating the ice jams in the Connecticut River at Windsor. Apparently there existed a multitude of interacting conditions: surface constrictions, possible high backwater conditions from the Brattleboro Dam, a solid ice cover in the backwater of the Brattleboro Dam that prevented ice transport from the Windsor area, deep pools followed by shallow depth sections upstream of bridge piers, a greater ice thickness accumulation of fragmented floes than would result if a uniform cover could be established in the same reach, and the diurnal fluctuation of river stage casued by the release of water at Wilder Dam. (Author) Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Hydrology Limnology and Potamology Snow Ice and Permafrost *HYDROLOGY *ICE *AERIAL PHOTOGRAPHS *CONNECTICUT RIVER POSITION(LOCATION) THICKNESS SHALLOW WATER BARRIERS VERMONT CHANNELS(WATERWAYS) LOW ALTITUDE River ice Ice jams Windsor(Vermont) Ice floes Froude number Brattleboro dam Backwater Bridge piers Wilder dam |
spellingShingle |
Hydrology Limnology and Potamology Snow Ice and Permafrost *HYDROLOGY *ICE *AERIAL PHOTOGRAPHS *CONNECTICUT RIVER POSITION(LOCATION) THICKNESS SHALLOW WATER BARRIERS VERMONT CHANNELS(WATERWAYS) LOW ALTITUDE River ice Ice jams Windsor(Vermont) Ice floes Froude number Brattleboro dam Backwater Bridge piers Wilder dam Calkins,D J Hutton,M S Marlar,T L Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont |
topic_facet |
Hydrology Limnology and Potamology Snow Ice and Permafrost *HYDROLOGY *ICE *AERIAL PHOTOGRAPHS *CONNECTICUT RIVER POSITION(LOCATION) THICKNESS SHALLOW WATER BARRIERS VERMONT CHANNELS(WATERWAYS) LOW ALTITUDE River ice Ice jams Windsor(Vermont) Ice floes Froude number Brattleboro dam Backwater Bridge piers Wilder dam |
description |
Sections in the Connecticut River where ice jam potential is high were identified through the use of low-altitude black and white photographs taken during low-flow, ice-free conditions. The hydraulics and mechanics of ice jam initiation were investigated in the river reach where these sections were identified. Certain areas were found in the river that had a high susceptibility to ice clogging, but this high potential decreased with increasing discharge because of the improved surface conveyance of the ice through the reach. The stability of ice floes was established along the channel, but the floes generally became unstable as the flow increased. This was calculated by using a Froude number criterion. Grounding locations for ice became evident when the critical Froude number was zero for a given thickness and water depth. No single factor was determined to be responsible for initiating the ice jams in the Connecticut River at Windsor. Apparently there existed a multitude of interacting conditions: surface constrictions, possible high backwater conditions from the Brattleboro Dam, a solid ice cover in the backwater of the Brattleboro Dam that prevented ice transport from the Windsor area, deep pools followed by shallow depth sections upstream of bridge piers, a greater ice thickness accumulation of fragmented floes than would result if a uniform cover could be established in the same reach, and the diurnal fluctuation of river stage casued by the release of water at Wilder Dam. (Author) |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H |
format |
Text |
author |
Calkins,D J Hutton,M S Marlar,T L |
author_facet |
Calkins,D J Hutton,M S Marlar,T L |
author_sort |
Calkins,D J |
title |
Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont |
title_short |
Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont |
title_full |
Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont |
title_fullStr |
Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont |
title_full_unstemmed |
Analysis of Potential Ice Jam Sites on the Connecticut River at Windsor, Vermont |
title_sort |
analysis of potential ice jam sites on the connecticut river at windsor, vermont |
publishDate |
1976 |
url |
http://www.dtic.mil/docs/citations/ADA031572 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA031572 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA031572 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027551538413568 |