PPT Slide
The following picture shows sand ripples. This is an example
of a stripe pattern. We note the presence of defects, which
correspond to the disappearance or to the creation of a new
What causes the formation of such a pattern ?
What is the typical size (i.e. the distance between two adjacent
stripes) of such a pattern ?
Similar patterns are discussed in the subsection of the text
called “Shifting sands” (page 216, under GRAINS).