Dune Patterns, Namib Desert, Namibia
This detailed view of the remote Conception Bay sector of the Namibian coastline shows breakers and a strand plain on the left and complex dunes of the Namib dune sea on the right. A strand plain is a series of dunes, usually associated with and parallel to a beach, sometimes containing small creeks or lakes. The complexity and regularity of dune patterns in the dune sea of the Namib Desert have attracted the attention of geologists for decades; however, they remain poorly understood. The flat strand plain (~4 kilometers shown here) shows a series of wet zones that appear black where seawater seeps inland and evaporates. These patches are aligned with the persistent southerly winds, some of the strongest of any coastal desert.
The southerlies blow sand from the beaches--where it is constantly mobilized by wave action--and pile it up as dunes many tens of feet high. Note how the crests of the dunes, catching the morning light in this view, are aligned in a marked northwest-southeast orientation. These crests form transverse to the formative wind (i.e. crosswise), revealing an interesting feedback with the wind. The dunes act as obstacles, and obstacles cause winds to be deflected significantly to the right, in the southern hemisphere--in effect reorienting the southerly wind as a southwesterly wind. The higher the sand dunes grow, the more this effect comes into play.