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Experiments by Invited Researchers

 

Sea Ice Dynamics: The Role of Broken Ice in Multi-scale Deformation

Project acronym: HY+_HSVA-02_UCL
Name of Group Leader: Peter Sammonds
User-Project Title: Sea Ice Dynamics: The Role of Broken Ice in Multi-scale Deformation
Facility: Large Ice Model Basin (LIMB)
Data Storage Report: Data-Storage-Report_REv01_AHa_incl_App.pdf
Publications: Sammonds-Sea-Ice-Dynamics.pdf

Sea Ice Dynamics: The Role of Broken Ice in Multi-scale Deformation

Project Ref: HY+_HSVA-02_UCL
Project Provider: HSVA
Project Facility: Large Ice Model Basin (LIMB)
Project Type: Ships and Ice
Provider Contact: Dipl.-Ing. Andrea Haase
Project Leader: Professor Peter Sammonds
Project Users: Dr. Eleanor Bailey Dudley, Sammie Buzzard, Dr. Benjamin Lishman, Prof. Aleksey Marchenko, Sally Scourfield, Mr Mark Shortt

Project Objectives:

dynamics is crucial if the impacts of climate change are to be understood and adaptation strategies can be implemented. Since shear deformation and slip are controlled by friction, a better understanding of the frictional behaviour using realistic representations of broken ice between sliding ice floes is essential for understanding Arctic Ocean dynamics.

Our project objectives are:
1. Perform ice tank experiments in which a saline ice block, representing a sea ice floe, flanked by ice gouge, is deformed by a pusher plate and confined by side loading, in double direct shear.
2. Simulate these experiments using a discrete element model, and use the experimental measurements to calibrate and validate the model.
3. Use the validated discrete element model to calculate sliding stresses, as a function of broken ice gouge parameters.

Our original specific experimental objectives at HSVA were to:
1. Measure the stresses in the ice blocks and confining region and the relative displacement of broken ice in double direct shear experiments.
2. Investigate the effect of broken ice gouge angularity by using (i) flat, circular pancakes of ice and (ii) regular angular fragments.
3. Investigate the effect of (i) hold time and (ii) sliding velocity variation.
4. Conduct experiments at two controlled ambient temperatures. We added to these original objectives:
5. Use two different sizes of ice gouge for both pancake and angular fragments.
6. Perform consolidation experiments on large stacked ice blocks: freefloating, submerged, with and without a liquid layer at the interface.

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