GEOG306 Lecture Notes - Lecture 9: Downhill Creep, Mudflow, Debris Flow

• School: University of Waterloo
• Department: Geography and Environmental Management
• Course: GEOG306
• Professor: Johanna Wandel

Document Summary

2 part: part 1: short answer, 3-6 marks each (27 total, one question on thursdays video, part 2: drr toolkit, 1 multi-part answer (27 total) D(cid:294)(cid:304)(cid:301)(cid:297)(cid:286)(cid:288)(cid:290)(cid:298)(cid:290)(cid:299)(cid:305) (cid:300)(cid:291) (cid:304)(cid:306)(cid:303)(cid:291)(cid:286)(cid:288)(cid:290) (cid:298)(cid:286)(cid:305)(cid:290)(cid:303)(cid:294)(cid:286)(cid:297)(cid:304) (cid:289)(cid:300)(cid:308)(cid:299) (cid:304)(cid:297)(cid:300)(cid:301)(cid:290) (cid:306)(cid:299)(cid:289)(cid:290)(cid:303) (cid:305)(cid:293)(cid:290) (cid:291)(cid:300)(cid:303)(cid:288)(cid:290) (cid:300)(cid:291) (cid:292)(cid:303)(cid:286)(cid:307)(cid:294)(cid:305)(cid:310) : very slow creeping erosion, very fast earthquake triggered landslide. Slow speed: soil creep: fast speed: rock fall, dry conditions: rock fall, wet conditions: mudflow, key driving variable, other than gravity, is water, material is either characterised as fall, slide, or flow. Any piece of material sitting on top of another are held there by gravity. Friction holds it in place (normal force) If you add a little water electrostatic attraction: a lot of water lubrication, determinates of movement: Shape of grains: consolidation (material strength, cohesion (chemical binding) Freeze-thaw, thermal expansion/contraction, animal disturbance, rain lubrication slide. The freeze lifts particles of soil and rocks and when there is a thaw, the particles are set back down, but not in the same place as before.