Brash Ice Behavior.

The behavior of brash ice, its formation and recommended vessel operating procedures are presented. Brash ice behaves as a Mohr-Coulomb solid below a critical strain rate or ship speed. Above this speed, fluidization of the medium occurs and the resistance appears to be that of a viscous, laminar fl...

Full description

Bibliographic Details
Main Author: Greisman,Paul
Other Authors: COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT
Format: Text
Language:English
Published: 1981
Subjects:
Snow
Ice and Permafrost
Civil Engineering
Marine Engineering
*Ice
Fragments
Channels(Waterways)
Mechanical properties
Ship hulls
Interactions
Resistance
Laboratory tests
Field tests
*Brash ice
Mohr-Coulomb theory
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA104152
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA104152
Description
Summary:The behavior of brash ice, its formation and recommended vessel operating procedures are presented. Brash ice behaves as a Mohr-Coulomb solid below a critical strain rate or ship speed. Above this speed, fluidization of the medium occurs and the resistance appears to be that of a viscous, laminar fluid. The optimum operating speed for a vessel in brash is at the viscous threshold, found here to be 0.12 sg.rt of gL) where g (32.2 fS-2) is the acceleration of gravity and L is the length of the vessel. Repeated passages through brash-filled channels to keep them unconsolidated are generally unadvisable due to the attendant enhancement of the accretion rates. The laboratory and field experiments employed in this study are presented. Laboratory tests in brash ice appear to yield very useful results that are good predictors of full-scale resistance. (Author)

Similar Items