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Hydraulic model study of Port Huron ice control structure D. J. Calkins, D. S. Deck and D. S. Sodhi

By: Calkins, D. J [VerfasserIn].
Contributor(s): Deck, D. S [VerfasserIn] | Sodhi, D. S [VerfasserIn] | Cold Regions Research and Engineering Laboratory <Hanover, NH> [Herausgebendes Organ].
Material type: materialTypeLabelBookSeries: CRREL Report 82-34.Set: Hydraulic model study of Port Huron ice control structurePublisher: Hanover, New Hampshire U.S. Army Cold Regions Research and Engineering Laboratory 1982Description: 68 Seiten Illustrationen.Content type: Text Media type: ohne Hilfsmittel zu benutzen Carrier type: BandSubject(s): Eis | Forschungsschiff | Laborexperiment | ModellGenre/Form: ForschungsberichtOnline resources: Click here to access online
Contents:
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
Summary: 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.
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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

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.

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