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Erosion and Deposition by Streams

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Shaffana Ahammad

on 27 March 2014

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Transcript of Erosion and Deposition by Streams

http://hmxearthscience.com/Warehouse/geology/surface_processes/animations/meandering%20stream.swf
EROSION
Bending Streams
After a long period of time, the meander becomes very curved, and eventually the neck of the meander will become narrower and the river will cut through the neck at a time of flood, cutting off the meander and forming an oxbow lake. The water is the fastest at the outside curves.
Discharge changes after a heavy rain by velocity, width, and depth. This affects the amount of material a stream can transport because the higher the discharge the higher the velocity the stream has, enabling it to carry different sized sediments.

The difference in velocity is mostly due to the great efficiency of the large downstream channel. The channel of a stream is a natural stream way made by a stream.


Velocity and Deposition
In a bending stream the velocity is the greatest at the outer curve as well as the area with the most depth. In a bending stream erosion takes place on the outer curve on the bend. Meanwhile, in the inner curve of the bend, deposition takes place due to the decrease in velocity.

In a straight stream the velocity is the greatest in the center because the sides create friction between the rocks, making the current slow.


Abrasion
is when particles carried by water or wind weather away rocks. If sediments are transported by a stream, their shapes will be different.


The Letter "V" describes a youthful steep valley. After a long period of time, the river becomes very curved, forming a
Meander
. A Meander is a bend in a watercourse/river and are gentle slopes. Eventually the neck of the river will become narrow and form an
Oxbow
lake.
Velocity
is the speed of something goes in a direction.If sediments are transported by a stream, the higher the velocity, the larger particle size the stream can carry.

A
Floodplain
is an area of low-lying ground adjacent to a river, formed mainly of river sediments and subject to flooding.



Stream erosion, sediment transport and deposition.


The river carries silt and other sediments till it reaches a larger body of water, such as an ocean or lake were it deposits those sediments at the mouth of the river. Overtime,the build up forms a
Delta
. A delta is fan shaped mass that gets deposited when the velocity of a stream decreases.
36. A watershed is an area or ridge of land that separates waters flowing to different rivers, basins, or seas. EX:DIVISION
37. A stream or river flowing into a lake or larger body of water.

40. The Genesee river flows North and into Lake Ontario.

As the water flows from Lake Erie into Lake Ontario, it flows over Niagara Falls. The top layer of the rock in a waterfall is resistant to weathering , the bottom layer however is soft to weathering.


Where Do Rivers End?
The minimum stream velocity needed to move a boulder is at least 200cm/s

By: Shaffana Ahammad, Amardeep Singh, Ishrat Ali, Ariadna Paez, & Christian Vazquez
The End.
Erosion
is the process in which rock is being worn down by water and air driven by gravity.
Deposition
is when sediments get carried away by wind to be deposited somewhere else. This happens when the agents of erosion increase in speed then different sized sediment will be carried.


Lol I'm a fish :D
The Hudson River begins near Mt. Marcy and ends near the city of Albany.


The Mohawk River is a tributary of the Hudson River.
As the diameter increases, the velocity of the stream flow decreases.
A velocity of 100cm/s may move pebbles.
Sand would be deposited if the velocity decreases from 100cm/s to 0.5cm/s
If a rock has a diameter of 0.05 , its referred to as silt.
In a straight stream the water is deepest at the center.
The pebbles, sand,silt,clay, and salt are carried to a larger body of water.
The bigger the sediments the lower it is in the stream.
Gradient is the change in field value/distance
Stream Discharge
is the product of its velocity.
A high gradient indicates a steep slope and rapid flow of water.
Whirlpools create turbulence and increases the erosion capacity. This causes the waterfall to carve deeper into the bed and to recede upstream. Often over time, the waterfall will recede back
Examples of Drainage Patterns are:

Different drainage patterns form due to the structure of the rocks in the drainage basin.
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