The Work of Streams and Stream Gradation Stream Erosion – streams erode in various ways depending on the nature of the channel materials. Flowing water drags on the bed and banks and forces particles to hit. This can erode alluvial materials (sand, silt, clay, and gravel.) This is known as hydraulic action. Hydraulic Action : stream erosion by impact force of the flowing water upon the bed and banks of the channel. It can carve out enormous quantities in a short amount of time when river flow is high. The Work of Streams and Stream Gradation Stream Erosion The larger stronger fragments become rounded as they travel. Cobbles and boulders roll over the stream bed and crush and grind the smaller grains, producing a wide assortment of grain sizes. Process of mechanical wear is called abrasion. Abrasion : erosion of bedrock of a stream channel by impact of particles carried in a stream and by rolling of larger fragments over the stream bed The Work of Streams and Stream Gradation Stream Erosion
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