GPHY 102 Lecture 19: L19

• School: Queen's University
• Department: Geography
• Course: GPHY 102
• Professor: Ryan K Danby

Document Summary

Splash, sheet, rill, and gully erosion all contribute to slope erosion. Stream erosion and deposition occurs within stream channels. Movement of particles depends on size: smaller mover further than larger. Erosional landforms: shaped by progressive removal of earth material (e. g. ravines, canyons) Depositional landforms: shaped by relocation of earth material (e. g. fans, floodplains) Hjulstrom"s curve: framework for understanding fluvial processes, focuses on sediment diameter (i. e. grain size) and velocity of strain (i. e. diameter (i. e. grain size) and velocity of strain (i. e. flow velocity) Lateral erosion sideways erosion of banks that move channel to the side. Vertical erosion most prominent in rivers high above base level. Degradation lowering base level (vertical and lateral erosion) Aggradation stable or rising base level (vertical and lateral deposition: (*think of rising sea level*) Rivers will grade to a longitudinal profile that is generally steeper in the headwaters and gentler near the mouth. Erosion is focused in headwaters, deposition in lower reaches.