Ice friction: Glacier sliding on hard randomly rough bed surface

Area of Science:

• Glaciology
• Tribology
• Materials Science

Background:

• Ice friction is crucial for understanding glacier dynamics and ice-related engineering challenges.
• Existing theories do not fully capture the complex mechanisms governing ice friction on rough surfaces.

Purpose of the Study:

• To develop a comprehensive theory for ice friction on hard, randomly rough surfaces.
• To extend previous theoretical frameworks by incorporating multiple physical processes.

Main Methods:

• Developed a theoretical model for ice friction, integrating regelation, viscoelastic dissipation, and cavitation.
• Employed numerical simulations using realistic surface roughness power spectra.
• Analyzed scenarios with both air-filled and water-filled cavities.

Main Results:

• Calculated frictional shear stresses based on the new theory.
• Demonstrated the model's ability to reproduce observed friction levels for temperate glaciers.
• Showcased the influence of different cavity types on friction.

Conclusions:

• The presented theory provides a more complete explanation for ice friction.
• The model's consistency with experimental data validates its approach for temperate glaciers.
• This work offers a foundation for further research into ice-surface interactions under various conditions.