Figure 6
From: Phase diagrams of dune shape and orientation depending on sand availability
Transitions in dune shape around the Tibesti Massif (east central Sahara), a zone of low sand availability.
(a) Map of σF/σI-value derived from the wind data. The continuous map is generated by linear interpolation based on the horizontal spatial resolution of 0.25° × 0.25° of the wind data. Local dune fields exhibit (b) barchans (image credit: Google Earth), (c) fingers breaking up into barchans (image credit: Google Earth) and (d) fingers elongating in the direction of the resultant sand flux (image credit: Google Earth). All these different dune types are reported in (a) using black symbols. Insets in (b–d) show the local flux roses. The map used in figure (a) is generated by GMT (The general mapping tools).
