Figure 1
From: Phase diagrams of dune shape and orientation depending on sand availability
Formation and evolution of dune fields for θ = 130°, N = 2 and two conditions of sand availability.
(a) Dunes grow in height and wavelength from a flat bed with no restriction in sand availability; (b) A finger dune extends on a non-erodible ground from a localized sand source. The red and blue arrows show the sand flux vectors of the dominant and secondary winds, respectively. The non-erodible ground is shown in gray. The cellular space has a square basis of side L = 600 l0. As shown by the orientation of the superimposed bedforms in (a) and the orientation of the finger tip in (b), images are taken after the secondary wind at the end of the cycle of wind reorientation.
