Barchan dunes have long been ... an "eye-catching" impact crater in the Sahara Desert. The oculus-like structure is surrounded by migrating sand dunes that are capable of traveling more than ...

I got my first lesson in the physics of sand dunes in 1998 on an expedition into ... officer who pioneered motorized travel in the Libyan Desert in the 1920s and ’30s. Bagnold described barchans ...