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.