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Unformatted text preview: A streams capacity increases sharply as its velocity rises. Faster currents can hold more sediment in suspension. The capacity to move bed load also increases with velocity because faster water drags against the bed harder. When water flow increases, a stream that is flowing in sand, silt, and gravel will widen and deepen. When the flow slows, stream will deposit material in the bed, filling the channel. The Work of Streams and Stream Gradation Stream Erosion Three ways that streams erode: Hydraulic Action : stream erosion by impact force of the flowing water upon the bed and banks of the channel 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 Corrosion : erosion of bedrock of a stream channel by chemical reactions between solutions in stream water and mineral surfaces...
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- Spring '10