I went out into the open field behind the Conservation District office and photographed these small snow "dunes". None of these features was more than a few inches in height, but they display the classic features of certain types of dunes.
The first feature is a barchan dune. Barchan dunes form in open areas where there are no obstructions. A barchan dune is shaped like an arch with the curve of the arch pointing into the wind and arms extending downwind. In this first picture, there are two barchan dunes on the right half of the image.
|Snow "dune" features - Barchan dunes to the right of the image|
|Snow "dune" features - note wind direction (arrow) and barchan dunes (arcs)|
|Snow "dune" features - barchanoid dune in center of image|
|Snow "dune" features - note wind direction (arrow) and barchanoid dune (curving line)|
This image shows the transition between barchanoid and transverse dune forms. The closest formation still shows the undulating character of a barchanoid dune, but the dunes doing off into the distance have straightened out forming a series of ridges perpendicular to the wind.
|Snow "dune" features - transverse and barchanoid dunes|
|Snow "dune" features - note the wind direction (arrow), barchanoid dune (closest line), and transverse dunes (furthest three lines)|