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DY: Fachverband Dynamik und Statistische Physik

DY 57: Poster: Statistical Physics; Critical Phenomena; Stochastic Thermodynamics; Extreme Events; Data Analytics

DY 57.14: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1C

CFD simulation of the wind field over a terrain with sand fences: Critical spacing for the wind shear velocityIzael Araújo Lima1, •Eric Josef Ribeiro Parteli2, Yaping Shao2, José Soares Andrade Jr.1, Hans Jürgen Herrmann1,3, and Ascânio Dias Araújo11Departamento de Física, Universidade Federal do Ceará, Fortaleza, Brazil — 2Department Geowissenschaften, Universität zu Köln, Cologne, Germany — 3PMMH, ESPCI Paris, France

Sand fences are often erected to reduce wind speed and prevent aeolian soil erosion. However, the search for the most efficient array of fences by means of field experiments alone poses a challenging task. Here we apply Computational Fluid Dynamic simulations to investigate the three-dimensional structure of the turbulent wind field over an array of fences. We find that the area of soil associated with wind shear velocity values smaller than the minimal threshold for sand transport has two regimes, depending on the spacing Lx between the fences. When Lx is smaller than a critical value Lxc, the wake zones associated with each fence are inter-connected (regime A), while these wake zones appear separated from each other (regime B) when Lx exceeds this critical value of spacing. The system undergoes a second order phase transition at Lx = Lxc, with the cross-wind width of the protected zone scaling with [1−Lx/Lxc]β in regime A, with β ≈ 0.32. Our findings have implication for a better understanding of aeolian transport in the presence of sand fences, as well as to develop optimization strategies for anti-desertification measures.

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DPG-Physik > DPG-Verhandlungen > 2020 > Dresden