GL102 Lecture Notes - Lecture 7: Terminal Velocity, Alluvium, Dissolved Load
Document Summary
Runoff amount depends on infiltration capacity, controlled by. When soil is saturated, sheet flow begins as a thin, unconfined sheet of water. Sheet flow develops into channels called rills. A true stream has a channel flowing along a definite course. Mouth (where stream ends in water body. Longitudinal profile (side view of stream) displays gradient. Water molecules flow in straight paths, parallel to channel. Water moves in a chaotic and erratic fashion, as whirlpool like eddies. Erosion and transport is directly related to stream velocity, which depends on. Vertical drop of a stream over a fixed distance. Steeper gradients means more gravitational energy available for flow and higher velocity. Channel cross-section shape, size, and roughness affect frictional drag. Turbulent flow leads to the formation of rapids. Volume of water moving past a given point per time (m 3 /sec, cfs) As discharge increases, channel width, depth, and stream velocity usually increase.
