Home assignment 1, due Tue 1/24
The morphology of sand dunes can in some cases be viewed as a
series of symmetry breaks. Eg. First transverse dunes, then barchanoid
dunes, and finally barchan dunes. Another example would be: transverse
dunes, barchanoid dunes, linear dunes, star dunes. See for example
McKees drawings in Figures 3 and 4 in
http://www.nps.gov/whsa/Sand%20Dune%20Geology.htm.
Make your own 2D idealized scetches of
such development and give the sequence of symmetry groups for both
these sequences of sand dunes given above.