How and where a river deposits
Hello steemians, hope you are all having a good day. My post today is an addition to my previous posts on river processes.
All materials carried by the river as I have explained in my previous post are deposited down the valley.
Source
Deposition is the processes where the material being transported by a river is deposited. Deposition occurs when a river loses energy. This can be when a river enters a shallow area or towards its mouth where it meets another body of water.
When rivers flood the velocity of water slows. As the result of this, the river's capacity to transport material is reduced and deposition occurs. This deposition leaves a layer of sediment across the whole floodplain. After a series of floods layers of sediment form along the floodplain.
This is another way in which a river behaves like a human being. When one is carrying a load and one gets tired or has additional load suddenly added on, one puts down the load or at least part of it and rests. In like manner, when a river is carrying its load and it gets tired or has more load suddenly added to it, it deposits the excess load.
where does a river deposit?
A river gets tired and loses its energy, and this happens:
Where the volume of the river decreases, like where it flows across arid lands and loses water by rapid evaporation or seepage.
Where the velocity decreases as a result of the decrease in channel gradient, like in flood or coastal plains, at the inner bend of a river meander, where the friction slows down the river flow, or on entering a lake or a sea.
Where more load is added suddenly to a river by mass movement from the valley sides, or by a fast flowing, heavily loaded tributary stream.
Under any of the above conditions, a river deposits its excess load in action called aggradation. The deposited materials are collectively called alluvium or alluvial deposits. These deposits are sorted out heavier ones are dropped first and upstream, and finer ones las and downstream.
I got a fun fact for ya! Those areas you pointed out are also where gold tends to deposit in river beds. In the right areas people make a pretty penny dredging up gravels from point bars.
Also I didn’t see it in this post: the point bar is the depositional environment, usually on the inside track of a turn. The cut bank is the erosional environment, usually on the exterior track of a turn.
Keep up the good work!
Thanks, I will mention point bars when i write on features of river deposition.
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Thanks for this informative post. :)
Thanks for stopping by.
Thanks for sharing the knowledge. Made me remember my environmental studies classes :)
Thanks for going through my blog.