Four processes by which the river erodes its channel. 1.Hydraulic action 2.Corrasion 3.Attrition 4.Corrosion Explanations and pictures: 1. Hydraulic Action Hydraulic action is the process by which the physical force of moving water erodes the riverbed and banks. As water flows, it exerts pressure on the surfaces it encounters, particularly in areas of high velocity. This pressure can infiltrate cracks and fissures in rocks, leading to dislodgement as the water forces air out and creates a vacuum effect. Over time, repeated cycles of pressure changes weaken rock structures, causing pieces to break off and be carried downstream. This process is especially effective in softer or fractured rock types, contributing significantly to the overall erosion of river channels. 2. Corrasion Corrasion, occurs when sediment particles carried by the river grind against the channel surfaces. As the river flows, it transports various sizes of sediment—from fine silt to larger boulders—depending on ...
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