Efficiency of wind fences is evaluated by the reduction of wind velocity and the effective shelter area behind the fence. Fenceporosity is the most influential structural parameters in the porous fence design, and has significant impact on the structure ofwind velocity and turbulence leeward. In this work, three fences with porosity of 23%, 35% and 45% have been tested under10m/s inlet velocity in an environmental wind tunnel. An ultrasonic anemometer was used to measure three dimensional velocityvectors and the fluctuations of velocity vectors with a designed spatial resolution. The obtained data were used to calculatevelocity magnitudes, turbulence intensities and turbulent kinetic energies in the test domain. Porosity influencing the structure ofturbulence intensity and effective fence zone were discussed in this paper. Neither the distribution of wind velocities nor thestructure of turbulence alone can provide sufficient information to assess the performance of porous fences. Consideration of thetargeted reduction rate of wind velocity needs to be taken for optimal fence design
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