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Criado por Tamara Herrington
mais de 8 anos atrás
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Questão | Responda |
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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