Mechanism of Rapid Rise of Groundwater Levels and Simultaneous Generation of Debris Flows During Heavy Rainfall

Key Points

• The study aims to examine the correlation between rapid groundwater level rise and debris flow generation during heavy rainfall events.
• Long-term observation of groundwater levels
• Indoor model experiments simulating rainfall effects
• Evaluation using rainfall index R′
• Groundwater level rises correlated with effective rainfall of 72 hours half-life.
• Piezometric pressure exceeds groundwater levels due to surface water retention.
• Rainfall index R′ proved effective as an indicator of rapid groundwater level surge.