File:Avalanche Slope on Dunes (46116909755).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(4,608 × 3,456 pixels, file size: 2.6 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

NPS/Patrick Myers

  1. ScienceSaturday - How do dunes move?

Unless it's spring or there is a weather front moving through, it's surprisingly calm here at Great Sand Dunes. When it is windy, winds are predominately from the southwest, blowing sand grains toward the mountains. Grains are packed more tightly on the windward side of each dune, sometimes forming ripple bedding.

As sand continues to migrate from the windward side, it deposits on the upper part of the leeward side, starting to increase the angle of the slope. However, the 'angle of repose' of a sand slope here can't exceed 34 degrees. The pressure will eventually cause a small avalanche to release down the leeward side of the dune, returning the slope to 34 degrees, and causing the dune to move slowly forward. At Great Sand Dunes, you can feel geological processes happening as you hike and slide down the sand!
Date
Source Avalanche Slope on Dunes
Author Great Sand Dunes National Park and Preserve

Licensing

[edit]
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.


This image was originally posted to Flickr by Great Sand Dunes National Park and Preserve at https://flickr.com/photos/94707653@N06/46116909755. It was reviewed on 1 January 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark.

1 January 2022

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current11:49, 4 October 2021Thumbnail for version as of 11:49, 4 October 20214,608 × 3,456 (2.6 MB)Ltn12345 (talk | contribs)Transferred from Flickr via #flickr2commons

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Avalanche_Slope_on_Dunes_(46116909755).jpg&oldid=808067409"