Rivers Erosion 0.0 / 5 ? GeographyRivers and fluvial processesASOCR Created by: MollyCreated on: 18-01-15 17:32 What 6 factors affect the rate of erosion? Load, velocity, gradient, geology, pH, Human impact 1 of 14 Solution the removal of chemical ions, especially calcium. Form of erosion especially effective on chalk & limestone 2 of 14 Hydraulic Action Force of air and water on the sides of rivers and in cracks. Occurs as a river tumbles over a waterfall and erodes rocks below 3 of 14 Abrasion wearing away of the bed and bank by the load carried by the river 4 of 14 Attrition wearing away of the load carried by the river. It creates smaller, rounder particles 5 of 14 How does the load affect rate of erosion? Heavier & sharper the load, the greater the potential for erosion 6 of 14 How does velocity affect rate of erosion? The greater the velocity, the greater potential for erosion 7 of 14 How does gradient affect the rate of erosion? Increased gradient = increased rate of erosion 8 of 14 How does the geology affect rate of erosion? Weak, unconsolidated rocks such as sand and gravel are more easily eroded than consolidated rocks 9 of 14 How does pH affect rate of erosion? Rates of erosion are increased when water is more acidic 10 of 14 How does human impact affect rate of erosion? Deforestation, dams and bridges interfere with the natural flow of the river and frequently end up increasing the rate of erosion 11 of 14 Unconsolidated rocks Loose, broken material that is often easily eroded 12 of 14 Consolidated rocks Solid rocks or sediments that have been bonded together by a sedimentary cement 13 of 14 Entrainment Picking up particles from the ground/bed of the river 14 of 14
1.1 What processes and factors are responsible for distinctive fluvial landforms? 2.0 / 5 based on 1 rating
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