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Optimal array of sand fences.

Izael A Lima1, Ascânio D Araújo1, Eric J R Parteli2

  • 1Departamento de Física, Universidade Federal do Ceará, 60451-970 Fortaleza, Ceará, Brazil.

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|March 25, 2017
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Summary
This summary is machine-generated.

Optimizing sand fence design is crucial for combating desertification and reducing dust emissions. Computational Fluid Dynamics reveals that 50cm high fences offer the most cost-effective soil protection against wind erosion.

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Area of Science:

  • Environmental Science
  • Geophysics
  • Fluid Dynamics

Background:

  • Sand fences are vital for mitigating wind erosion and dust emissions in desertified regions.
  • Current optimization of sand fence arrays relies heavily on empirical methods.
  • Understanding airflow dynamics is key to maximizing soil protection with minimal material.

Purpose of the Study:

  • To quantitatively analyze turbulent airflow over sand fence arrays using Computational Fluid Dynamics (CFD).
  • To determine the optimal fence configuration for soil protection and cost-efficiency.
  • To identify factors influencing the reduction of wind shear velocity below sand transport thresholds.

Main Methods:

  • Computational Fluid Dynamics (CFD) simulations were employed to model airflow.
  • Analysis of turbulent airflow through fence arrays as a function of porosity, spacing, and height.
  • Development of a cost function based on fence material quantity.

Main Results:

  • The study identifies factors controlling the fraction of soil area protected from wind shear.
  • Optimal fence height for cost-effective soil protection was found to be approximately 50 cm.
  • Fences around 1.25 m in height were found to be the most expensive.

Conclusions:

  • CFD modeling provides a quantitative approach to optimizing sand fence design.
  • A 50 cm fence height represents a cost-effective solution for wind erosion control.
  • Further research can refine designs for enhanced desertification mitigation and climate impact reduction.