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
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.

Creative Commons Licence [Some Rights Reserved]   © Copyright Rudi Winter and licensed for reuse under this Creative Commons Licence.
Category: Erosion
This photo is linked from: Automatic Clusters: · Meet the Hafren Severn at Llanidloes [2] Other Photos: · Upper Cwm Clywedog · Clywedog gorge · Rock strata by the Afon Clywedog · Upper Cwm Clywedog ·
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SN8393, 35 images   (more nearby 🔍)
Photographer
Rudi Winter   (more nearby)
Date Taken
Sunday, 10 April, 2011   (more nearby)
Submitted
Saturday, 23 April, 2011
Subject Location
OSGB36: geotagged! SN 839 930 [100m precision]
WGS84: 52:31.3481N 3:42.7567W
Camera Location
OSGB36: geotagged! SN 8396 9305
View Direction
SOUTH (about 180 degrees)
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SW S SE
Image classification(about): Geograph
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