Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2017 Dec 7;122(12):2544–2573. doi: 10.1002/2017JE005324

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

©2017. The Authors.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

PMC Copyright notice

Large ripples and impact ripples at the Gobabeb site on Namib Dune. (a) Two prominent large ripples at Gobabeb show a strong asymmetry and evidence of feedback between ripple topography and airflow where impact ripples are deflected by the large ripple, and grainflow and grainfall form on the lee slope. Note the orientation of the small ripples on the stoss slopes of the ripples are oblique to the primary crest line orientation. (b) A zoomed portion of the same Mastcam image showing the details of the grainflow and interfingering of grainflow and along‐slope migrating small ripples. Color differences at the edge of the grainflow shown in Figure 7a may indicate sorting of grains during the avalanche process. (c) Millimeter‐scale parallel lamination exposed in a wheel‐trench superposed by impact ripples and interpreted to be wind‐ripple stratification generated by the migration of impact ripples. Images: mcam05600, Sol 1221 (Figures 7a–7c).