GPHY 102 Lecture Notes - Lecture 18: Stream Bed, Clay Minerals, Flow Velocity

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

Document Summary

Gphy102 lecture 18 fluvial processes and landforms. Background: depositional landforms, fluvial landforms are those shaped by running water. Processes associated with overland flow and stream flow: dominates continental land surfaces at a global scale. Such as glacial, aeolian, waves, etc: erosional landforms. Transport of material in water that is abrasive and causes erosion of the channel bed. Suspended sediments, rocks, etc: erosive capacity of streams depends on. Indicative of periodicity, such as flooding: usually sorted due to differential settlement of material out of suspension. Rocks first, then sand, then small particles, etc. Sediment size (grain size, particle size: clay <2um diameter, silt 2-62. 5um diameter, sand 62. 5um 2mm, pebbles 2-64mm, cobbles 64-256mm, boulders 256+mm, gravel refers to pebbles and larger grains, clay size is different from clay minerals. Clay grains can be made of many types of minerals. What deposits tell us about stream energy: no fines, just boulders.