1. The rapid, downward mass movement of particles coarser than sand, often including boulders one meter or more in diameter, at a rate ranging from 2 to 40 kilometers per hour. Debris flows occur along fairly steep slopes. 2. The material that descends in such a flow. deflation The process by which wind erodes bedrock by picking up and transporting loose rock particles.
The rapid downslope movement of debris (rock, soil, and mud).
A type of landslide that is a mixture of soil, water, logs, and boulders that travel quickly down a steep channel.