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Stream and River Erosion

Erosion

What is Erosion? Erosion is the removal and transport of surface material.

Deposition

What is Deposition? Deposition is the process by which material is dropped or settled.

Stream and River Erosion

What is a channel? The path that a stream follows. Where does stream and river erosion occur? It occurs on the outside bank where water flows faster. What do rivers erode? Rivers erode rock and soil. After rivers erode rock and soil, they deposit the rock and soil downstream. Rock and deposited by streams is called alluvium. Heavy minerals are sometimes deposited at places in the river where the current slows down. What is a discharge? A discharge is the amount of water a stream or river holds for a certain amount of time. What is gradient? Gradient is the measure of change in elevation over a certain distance.

Stream and River Deposition

Where does stream and river deposition occur? It occurs along the inside of the bank where water flows slower.What is deposition?

River Erosion

Mature rivers flow across wide river valleys and meander or snake across the flat plains. These meandering streams create large loop meanders that develop into oxbow lakes adjacent to the stream.
As a mature river begins to curve, it cuts and erodes into the outside of the curve and deposits sediment on the inside of the cure. This is due to the fact that the stream moves more rapidly on the outside of the curve and more slowly on the inside of the curve. Thus, as the erosion and deposition continues, the curve becomes larger and more circular.

oh my gosh why cant this be seen well anyway its an example of deposition. ill have to draw it oh my gosh why cant this be seen well anyway its an oxbow lake. ill have to draw it oh my gosh why cant this be seen . ill have to draw it

Eventually, the loop of the curve reaches a diameter of approximately five times the width of the stream and the river begins to cut the loop off by eroding the neck of the loop. Eventually, the river breaks through at a cutoff and forms a new streambed.
Sediment is then deposited on the loop side of the stream, cutting off the loop from the stream entirely. This results in a crescent-shaped lake that looks exactly like an abandoned river meander. Such lakes are called oxbow lakes because they look like the bow part of the yoke used with teams of oxen.





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