GG231 Lecture Notes - Lecture 5: Secondary Succession, Water Content, Geologic Hazards
Document Summary
Moves through the air before landing at the base of the slope. Dry process triggered by vibration, human or natural or wedging - ice or vegetation. Rapid process - a hazard to those underneath. Movement in contact with the underlying surface - along a plane surface. Examples - rockslide, translational slide slump, slip. Flows are plastic or liquid movement, in water or air. Mass breaks up and flows during movement. Types include: solifluction, mudflow, debris flow, debris or snow avalanche. Landslides are mainly a result of a change in the forces of the slope. These are referred to as the driving and resisting forces. The factor of safety is defined as a ration of the resisting forces to the driving forces. If one of these ratios is greater than one or the resisting forces are greater than the driving forces then the slope is stable.
