![]() The pressure of water breaks away rock particles from the river bed and banks. The force of the water hits river banks and then pushes water into cracks. There are four main processes of erosion that occur in rivers. This occurs mostly in the middle and lower stages of a river. This happens more in the upper stages of a river (the V of vertical erosion should help you remember the V-shaped valleys that are created in the upper stages). Vertical erosion makes a river channel deeper. ![]() Surface run-off and throughflow cause erosion at the point where the water enters the valley head. The bed and banks can be eroded making it wider, deeper and longer. All three depend on the amount of energy there is in a river. These are erosion, transportation and deposition. There are three main types of processes that occur in a river. River Processes: erosion, transportation and deposition & the Hjulström Curve
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