6 - • A stream’s capacity increases sharply as its...

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Accelerated Soil Erosion Colluvium : deposit of sediment or rock particles accumulating from overland flow at the base of a slope and originating from higher slopes where sheet erosion is in progress loose bodies of sediment that have been deposited or built up at the bottom of a low-grade slope or against a barrier on that slope, transported by gravity. Alluvium : any sediment laid by a stream that is found in a stream channel or in low parts of a stream valley subject to flooding. Can choke channels of small streams, making the water flood. Stream Transportation Stream Load : solid matter carried by a stream. It is carried three ways: Dissolved load : transported invisibly as ions Suspended load : clay and silt held within the water; generally the largest part of the load Bed Load : sand, gravel, larger particles rolling or sliding on the streambed The Work of Streams and Stream Gradation Stream Transportation Stream Load : solid matter carried by a stream.
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Unformatted text preview: • A stream’s 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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