GG101 Lecture Notes - Alluvium, Dissolved Load, Bed Load
Document Summary
Gg101 week 11 lecture 2: fluvial relating to, or occurring in a river, alluvium. Sediments transported and deposited by streams: drainage basin (watershed) Spatial area occupied and drained by a river system: drainage divide. Volume of water passing a point in a channel per unit time: for a simple channel, discharge is the product of channel depth (d), width (w), and stream velocity (v) Processes in a given stream channel, as discharge (q) increases there are also increases in stream width, depth and velocity: erosion. Overall breaking down, picking up, and transportation of materials involves a sequence of events: Detachment (hydraulic action and abrasion: pulls some material off the bank (detached from its position at rest) Entrainment (function of velocity: brings it into the flow transport (several modes of transport, sediments in a stream move by, suspension fine grain sediments suspended within flow, saltation. Sand grain moves through a series of jump/steps: traction (rolling) rolling along, solution.
