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Stream Erosion. Notes. Watershed. A major river or stream along with all the smaller streams that connect to it. Tributary. A small stream that feeds a larger river. Streams/Rivers.

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watershed
Watershed
  • A major river or stream along with all the smaller streams that connect to it.
tributary
Tributary
  • A small stream that feeds a larger river.
streams rivers
Streams/Rivers
  • Streams/rivers are running channels of water that begin at high elevation (source) and run to low elevations (mouth).
stream terms
Stream terms
  • Stream Velocity: Speed of water in a stream.
  • Discharge: The volume of water in a stream.
  • Erosion: The ability of a stream to carry and remove sediment.
  • Deposition: When a stream deposits sediment because the velocity slows down.
  • Gradient: The steepness of the slope of the stream channel.
relationship of terms
Relationship of Terms
  • As gradient increases velocity ________.
relationship of terms1
Relationship of Terms
  • As gradient increases velocity increases.
  • As gradient increases erosion ________.
relationship of terms2
Relationship of Terms
  • As gradient increases velocity increases.
  • As gradient increases erosion increases.
  • As discharge increases velocity ________.
relationship of terms3
Relationship of Terms
  • As gradient increases velocity increases.
  • As gradient increases erosion increases.
  • As discharge increases velocity increases.
  • As discharge increases rate of erosion _________.
relationship of terms4
Relationship of Terms
  • As gradient increases velocity increases.
  • As gradient increases erosion increases.
  • As discharge increases velocity increases.
  • As discharge increases rate of erosion increases.
  • As velocity decreases rate of deposition _________.
relationship of terms5
Relationship of Terms
  • As gradient increases velocity increases.
  • As gradient increases erosion increases.
  • As discharge increases velocity increases.
  • As discharge increases rate of erosion increases.
  • As velocity decreases rate of deposition increases.
life stages of streams
Life-stages of streams
  • Youthful stream:
    • Very steep slope.
    • V-shaped channel.
    • Steep canyon walls.
    • Straight channel.
    • High velocity.
    • High rate of erosion.
mature stream
Mature stream
  • The v-shape channel becomes more rounded.
  • Gradient is decreasing.
  • Velocity is decreasing.
  • Meanders begin to form.
  • A narrow flood plain begins to form.
old age streams
Old-age streams
  • Slow velocity.
  • Very wide flood plain.
  • Elaborate Meandering Patterns
  • Oxbow Lakes
river delta
River Delta
  • When a moving river reaches its destination, the river’s speed will decrease sharply.
  • This sharp decrease in velocity will cause an enormous amount of deposition to occur.
  • This depositional feature is known as a delta, named for the Greek letter shaped as a triangle.