Simulating Tsunami Inundation and Soil Response in a Large Centrifuge.

Area of Science:

• Geotechnical Engineering
• Coastal Engineering
• Fluid Dynamics

Background:

• Tsunamis cause significant coastal infrastructure damage, often worsened by soil instability.
• Laboratory tsunami simulations are challenging due to scale limitations and achieving dynamic similitude in conventional facilities.

Purpose of the Study:

• To investigate soil instability and flow-soil interactions during tsunami inundation.
• To develop and validate a centrifuge-based method for simulating tsunami-like loading on soil.

Main Methods:

• Reviewed dynamic similitude principles for fluid and soil domains under centrifuge conditions.
• Utilized a novel centrifuge apparatus to conduct experiments on a 1:40 scale model representing a large prototype soil field.
• Simulated tsunami-like flow with high water pressure and velocities, achieving dynamic similitude via controlled body force.

Main Results:

• The centrifuge method successfully replicated prototype tsunami conditions (pressure and flow velocity) at a reduced scale.
• Realistic flow-soil interaction dynamics were observed and measured.
• Enabled study of phenomena not reproducible in standard laboratory settings.

Conclusions:

• Centrifuge modeling is a viable and effective technique for simulating tsunami-like events and their impact on soil and coastal structures.
• This approach overcomes the scale limitations inherent in traditional wave tank facilities.
• Provides crucial data for understanding and mitigating tsunami-related risks to coastal infrastructure.