Figure 7: Maximal wind shear velocity, rescaled with the minimal threshold for sustained transport, u*t, as a function of the rescaled spacing L/hf for different values of the fences’ height hf.

Parameters of the simulation are the same as in Fig. 5. The results refer to the value of u*max between the last two fences of the array. The dotted line denotes u*max/u*t = 1. The inset shows u*t/u*t as a function of hf for fixed value of L/hf = 15.