River processes flashcards AS level

Tamara Herrington
Flashcards by Tamara Herrington, updated more than 1 year ago
Tamara Herrington
Created by Tamara Herrington over 5 years ago
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Question Answer
Bedload Large particles that cannot be picked up by the current. Saltation: pebbles/sand/gravel temporarily lifted and bounced along the riverbed. Traction: largest particles rolled along the riverbed.
Suspended load Fine particles of clay and silt are dislodged and carried by current turbulence.
Solution / dissolved load Soluble rock held in solution. Chalk/limestone.
Corrasion River picks up material and erodes the banks/bed by abrasion. Most effective during flooding. Erodes horizontally and vertically.
Attrition Bedload collides with other rocks which break into smaller pieces over time. Smooths angular rocks.
Hydraulic action Force of water breaks into cracks in river bank. Compressed air in cracks increases pressure and the bank breaks apart. Cavitation: collapsing bubbles of air weaken banks.
Solution / Corrosion Occurs continuously. Independent of velocity or discharge. Chemical composition of water (concentration of acid).
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