|
|
This is only a preview of the paper
Click here to register and get the full text.
Existing members click here to login
|
|
|
Landforms of River Erosion The ability of a river to erode is determined by the amount of energy a river processes. The direction of the erosion is linked to a river’s base level, usually sea level. Base level is the theoretical level down to which a river can erode. In its upper course, the river is high above its base level and the dominant processes are vertical erosion or downcutting. However, a large amount of energy is lost in overcoming friction and turbulence because of large boulders in the river bed. This leaves very little for active erosion and transportation except in times of high discharge, after heavy rain or snowmelt. In times of high discharge, the large bedload can be moved by traction and saltation which results in vertical erosion of the stream channel. Towards the river mouth, the river is closer to its base level and the main processes are lateral or sideways erosion. Along the course of a river outcrops of resistant rock or lakes may create local base levels and over time a river will try to even out these irregularities to create a graded or smooth profile. V shaped valleys and interlocking spurs In the upper course of a river vertical erosion dominates as the stream cuts downwards.
Approximate Word count = 826
Approximate Pages = 3.3
(250 words per page double spaced)
|
|
|
|
|
|