Abstract: Nine kinds of nylon grid barriers with different heights and sizes were laid in the wind-blown sand observation filed in the Ulanbuh Desert. The characteristics of wind-flow field under different wind speeds and the compound rule of windproof effect of sand barriers were revealed. The results showed that the compound change of windproof effect of grid sand barriers was affected by the height and size of sand barrier under different wind speeds. The wind speed at 0.1-m height near the sand barrier was decreased logarithmically with the increase of windproof width, which indicated that the attenuation rate of wind speed near the sand barrier was increased by 0.07 times when the wind speed increased by 1 m·s^-1; it was increased by 0.2 times when the height of sand barrier was increased by 0.1 m; and it was decreased by 0.07 times when the length of grid side was increased by 1 m. Among the nine kinds of grid sand barriers observed, compound effect of 1 m×1 m sand barrier with 30-cm height was the highest, but that of 2 m×2 m sand barrier with 15-cm height was the lowest. The results could provide the basic data and theoretical support for determining the reasonable windproof width of sand barrier, saving the layout cost of sand barrier, and optimizing the technology of sand barrier layout.

Key words: nylon grid sand barrier')">

nylon grid sand barrier, wind flow, windproof effect, compound change, Ulanbuh Desert