Aerial Photointerpretation of a Small Ice Jam

Aerial photos of a small ice jam on the Pemigewasett River near Plymouth, New Hampshire, were taken three days after the jam and compared with photos taken after the ice went out. The winter photos show a marked and sudden decrease in floe size apparently indicative of faster and longer movement of...

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Bibliographic Details
Main Author: DenHartog, Stephen L
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1977
Subjects:
Cartography and Aerial Photography
Snow
Ice and Permafrost
*PACK ICE
*PHOTOINTERPRETATION
AERIAL PHOTOGRAPHS
DRIFT
DYNAMICS
ICE
ICE BREAKUP
ICE REPORTING
MOTION
RIVER CURRENTS
RIVERS
SEASONAL VARIATIONS
SLOPE
VELOCITY
*ICE JAMS
PEMIGEWASETT RIVER
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA045870
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA045870
Description
Summary:Aerial photos of a small ice jam on the Pemigewasett River near Plymouth, New Hampshire, were taken three days after the jam and compared with photos taken after the ice went out. The winter photos show a marked and sudden decrease in floe size apparently indicative of faster and longer movement of the ice. The spring photos show a number of shallows and obstructions that apparently had no effect on the ice movement. It is concluded that this jam was caused by a change in slope and subsequent reduction in velocity.

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