Call number:
ZSP-201-82/34
In:
CRREL Report, 82-34
Description / Table of Contents:
The ice discharge through an opening in an ice control structure was documented to be a function of the floe size, ice type, ice floe conditions and vessel direction. The model data for the average ice discharge per vessel transit scaled to prototype values compared favorably with data taken at the St. Marys River ice control structure (ICS). The model results of the force measurements were also consistent with data taken at the St. Marys ICS. The dynamic loading conditions were independent of vessel direction. The dynamic loading to the structure using 3 types of ice (plastic, natural and urea-doped) showed a considerable difference in their means and standard deviations. The urea-doped ice was evaluated for dynamic loading conditions, and reasonable peak values of 3 to 5 times the mean load at each measuring position were recorded, independent of vessel direction. It appears that synthetic random ice floes may be used in model studies where ice discharge through an opening in a structure needs to be documented. This study shows the synthetic random ice floe discharge to fall reasonably within the values obtained for natural ice discharge for both rafted and non-rafted ice fields above the ICS. However, the question of whether synthetic ice can be used for analyzing force distributions and dynamic force loading criteria cannot be fully answered at this time because the load distributions of the synthetic and natural floes appear to differ.
Type of Medium:
Series available for loan
Pages:
68 Seiten
,
Illustrationen
Series Statement:
CRREL Report 82-34
URL:
https://apps.dtic.mil/docs/citations/ADA123715
URL:
https://hdl.handle.net/11681/9331
Language:
English
Note:
CONTENTS
Abstract
Preface
Introduction
Scope of work
Ice discharge from Lake Huron into St. Clair River
Water velocity profiles at Port Huron
Ice conditions
Physical model
Basis for selection
Description
Instrumentation
Model ice control structure
Open water calibration
Open water tests
Experimental procedures and techniques
Ice cover calibration
Ice control structure orientation
Analysis of ice discharge due to ship transits
Natural ice
Synthetic ice
Forces on the ice control structure
Static measurements
Dynamic force measurements
Potential additional shear stresses
Anticipated ice conditions with ICS
Conclusions
Literature cited
Appendix A. Application of model results
Appendix B. Suggested additional studies
Appendix C. Derivation of ice discharge
Location:
AWI Archive
Branch Library:
AWI Library
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