2.3.1 Wind tunnel description
The wind tunnel was provided by the Laboratory of Wind and Sand
Environment and Engineering of the Beijing Normal University. The wind
tunnel has a total length of 34.4 m. A high-power fan can adjust the
wind speed between 1 m/s and 40 m/s. The middle part of the wind tunnel
is used to place experimental materials. It is surrounded by toughened
glass and its cross-section is a rectangle of 0.6 m×0.8 m. The pitot
tube is used to measure the wind speed at different points in the
tunnel. In the study of wind erosion and particulate matter emission,
the abrader sand was not introduced into the wind flow upwind, but was
directly measured the erosion amount of samples under different BSCs. In
order to determine the amount of wind erosion, the tunnel uses an
electronic scale (accuracy: 0.0005 g) to weight the undisturbed soil
collection box.