The action of rivers and development of its profile.

Rivers are some of the most effective agents in the formation of various landforms. As the river flow downstream it shape and sculptures the land beds, transports eroded material and finally deposits the material which are called load.

 

      River Erosion.

It take place through the following processes;

  1. Hydraulic process.
  2. Corrosion.
  3. Attrition.
  4. Solution.
  • Hydraulic process.

       This is the eroding force of water on rocks and it take place when a river surges into cracks, sweeping against banks on the outside of bends with turbulence and eddying. The river erodes its bed and sides through quarrying or scooping of rocks.

  • Corrosion.

This is mechanical erosion or frictional wearing down of a rock surface by material (load) moved under gravity or transported by running water, ice, wind or waves. In river corrosion, rocks which had been scooped out by hydraulic action are carried downstream.The river-water picks up rock of its bed. As these rock particles are moved downstream, they corrode the river-bed by swirling fragment in the hollows in the bed rocks. These hollows are deepen by corrosion to form potholes. This process loosens and weakens the rocks along the river channel. The process  is also called abrasion.

 

  • Attrition process

 

Attrition is the constant wearing into progressively more rounded finer particles of a load of rock material through frictional rubbing and grinding as they are transported by the river downstream. In the process of transportation, these rock material are reduced in size as they knock against each other. It should however, be noted that in a strict sense, attrition is not one of the erosive processes. This is because it involves the reduction of already eroded material through other processes.

 

  • Solution\corrosion process.

 

Running water has a corrosive or dissolving effect on the rocks over which it flows. This is because it contains weak inorganic acids like carbonic acids and organic acids such as humic acids. As we have seen earlier, rocks such as limestone gypsum and dolomite are most likely to be affected. This process is also referred to as corrosion because of its corrosive effect.Running water can also dissolve soluble minerals in  the rocks over which it flows without involving reactions.

On my next research it will be about the classification of rivers and its three stages of development

Original Post

Hi Agnes,

Great research, I like the way you organized your post and made it easy to read! It's interesting to think about how powerful water can be that it can cause the rocks in the river bed to erode. They're more powerful than one might think.

Here are some websites you may use for your research on river classification and the three stages of river development:

https://fvcgeography.wordpress.com/physical/rivers/

http://www.yourarticlelibrary....and-meandering/60873

https://www.worldatlas.com/art...-are-classified.html

Good luck!

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