Comment on “Relevant Length Scale of Barchan Dunes”

A Comment on the Letter by Pascal Hersen, Stéphane Douady, and Bruno Andreotti, Phys. Rev. Lett. 89, 264301 (2002).

Figure 1

Submarine (black [1]) and aeolian (gray [4]; rescaled) migration speed data compared to $H^{-1}$ (dotted [1]) failing for small dunes, and $L^{-1}$ (solid [3]) compatible with the data.