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River Processes Erosion Transportation amp Deposition AQA GCSE 91 Geography
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What is the difference between lateral and vertical erosion? What are the four types of erosion and transportation in rivers? What is deposition and where does it occur? • This is the forty-fourth video for the AQA GCSE 9-1 Geography course, and the eleventh video of the Physical Landscapes topic. • The Physical Landscapes Playlist: • » • Physical Landscapes | AQA GCSE 9-1 Ge... • Follow me on all platforms: • » https://linktr.ee/keducate • Do you have a video suggestion? • » https://forms.gle/gxc3xHQ1b1wUeANT9 • Video Script: • Erosion is the wearing away of the river bed and banks. In rivers this can be categorised into vertical erosion which occurs downwards and lateral erosion which occurs sideways. • There are four erosional processes in rivers: • Hydraulic action is the sheer force of the water hitting the river bed and banks. Air becomes trapped in cracks and crevices in the banks, causing them to break apart. • Abrasion is when the load being carried by the river is hit against the bed or banks. • Attrition is when rocks being carried by the river are hit against each other - this makes them smaller and rounder. • Solution happens when the slightly acidic river water flows over rocks such as limestone or chalk, dissolving them. • There are also four types of transportation: • Suspension happens with the lightest sediment - it is carried within the water. This is most common in the lower course. • Saltation is where larger pebbles that are too heavy to be suspended in the water are bounced along the river bed. • Traction is where pebbles that are too large to be picked up are rolled along the river bed. This is most common in the upper course. • Solution is where soluble particles are dissolved into the river. • Deposition is where river sediment is dropped. This happens when the river loses energy and velocity, typically in shallow water, at the mouth or where water volume decreases. • -- • GCSE Geography • 14/05/2023 • Keducate
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