2011
SN8393 : How to make a V-shaped valley
taken 13 years ago, near to Dylife, Powys, Wales
How to make a V-shaped valley
The forces of erosion can be seen in action here. The Afon Clywedog runs in the valley. Since it has to descend by 260m over a distance of twenty kilometres in order to meet the Hafren/Severn at Llanidloes, it has cut a sizeable gorge into the upland plateau. The rocks on both sides of the valley are fairly crumbly, causing regular gravel avalanches and maintaining a uniform slope - the characteristic V shape
Link . The angle of the slope is determined by the angle of repose of the gravel, which depends on factors like grain size and shape and moisture content.
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