Hello my friends
So since the previous posts already covered the drainage basin, infiltration, the hydrological cycle, the water balance equation and hydrographs, then i guess i would cover the river channel processes.
First, we need to understand when we do get deposition then can we understand the river channel processes.
So, how do we get deposition?
The first way is when a river entering a lake or sea and the velocity of the water decreases, deposition will occur. Another way is when the example of the meander. In the inside of a meander, the velocity of the water would decrease and the friction that the water experience would increase and this will result in deposition. So just to summarize, deposition occurs wherever the speed of flow drops.


To summarize what Miss Tang taught us about the processes of erosion, just remember CASH.

C- Corrasion
when the river uses its load (the stuff that the water is carrying e.g. rock fragments) to constantly knock against the river channel's walls and beds and this will erode the river. Miss Tang would like to think it as the rocks fighting the river and the rocks would eventually win and cause some kind of gradient in the soil.
Take a look at this- http://www.geography.ndo.co.uk/animations6.htm

A- Attrition
when rocks knock against each other. This will result in the smoothing of the rocks and also make the rocks rounder and it will also break down the bigger rock fragments into smaller
pieces. Using miss Tang's words, it would be the rocks fighting each other.
Here's a link to help you understand better- http://www.geography.ndo.co.uk/animations3.htm

S- Solution (Corrosion)
When water in river reacts chemically with the minerals and other impurities and dissolve and result in a solution. Point to note- there is a difference between a suspension and a solution.
Suspension- Light particles carried by water http://www.geography.ndo.co.uk/animations7.htm
Solution- Transportation of dissolved loads
Please do get the difference right!
Actually they are all on the same website haha- http://www.geography.ndo.co.uk/animations5.htm

H- Hydraulic Action
Is when the sheer force of water weakens/loosens the cracks present in the soil of the river. Action of the flowing water that hits against the river banks and beds.
This will remove loose materials in the banks of meanders and also strong in rapids and waterfalls.

Okay that'll be all for my post. Its funny how something as small as a rock particle can cause all the difference in the huge river channel processes.

This is keewei kthx!