The dune model consists of a system of continuum equations in two space dimensions that combines a description of the average turbulent wind shear force above the dune with a continuum saltation model which allows for saturation transients in the sand flux. Unusual dune shapes including the wedge dunes observed on Mars appear within a wide spectrum of bimodal dune morphologies…
-Dune Formation Under Bimodal Winds, Eric Parteli et al., Proceedings of the National Academy of Sciences, December 29, 2009
This reminds me of the Little Prince’s Turkish astronomer, whose extraterrestrial discoveries no European believed because he wore native dress and a turban. KhairAllah could have told Parteli how sand dunes were formed, by angry Djinns, Wallahi, By God.