NF7651 : Lobes of sand

near to Griminis, Na h-Eileanan an Iar, Great Britain

Lobes of sand
Lobes of sand
A westerly wind was blowing sand up the dunes through saltation. The vegetation slows the wind, causing deposition of the sand in the dunes but they were already at the critical angle of repose for dry sand so it had to fall back down again in these mini 'sand avalanches'. These lobes were active, with frequent earth flows returning sand back down the face of the dunes. It is unusual for mass movement processes to occur with dry material, more normally the trigger for movement is water saturation reducing coherence or erosion removing removing the base rather than deposition increasing the angle. See NF7651 : Stinky Bay, Benbecula.
Creative Commons Licence [Some Rights Reserved]   © Copyright Hugh Venables and licensed for reuse under this Creative Commons Licence.
year taken
2012
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NF7651, 20 images   (more nearby)
Photographer
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Image classification?
Supplemental image
Date Taken
Monday, 17 September, 2012   (more nearby)
Submitted
Thursday, 4 October, 2012
Geographical Context
Coastal 
Subject Location
OSGB36: geotagged! NF 7650 5143 [10m precision]
WGS84: 57:26.2514N 7:23.6119W
Photographer Location
OSGB36: geotagged! NF 7650 5143
View Direction
EAST (about 90 degrees)
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Other Tags
Mass Movement  Dunes  Beach 

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