关键词: 蜂巢式固沙障, 防沙效应, 凹曲面

Abstract: New kind of comb-liked sand barrier, composed of the HDPE material, was used to substitute the traditional straw checkerboard sand barrier for experiment. Some conclusions were draw as follows: HDPE comb-liked sand barriers can increase the roughness of earth surface, decrease the lower wind speed, weaken sand transport, and then make moving sand surface stable. Due to the eddy role of air flow, the original sand surface within checkerboard sand barriers is in an equilibrium state after experiencing wind erosion and sand accumulation completely, and under this condition, a stable concave surface on sand surface may be formed. The ratio of the lowest erosion depth (h) to chord of concave surface ranges from 13.6/100 to 13.2/100, and is near to the value of traditional straw checkerboard sand barriers (13.3/100). The both have similar characteristic of airflow field. This stable concave surface produces a lifting effect for unsaturated wind-blown sand, which forms the un-deposed and carried condition of sand materials. The experiment showed that 20 cm high HDPE sand barriers with the 40% porosity will get obvious sand-defended effect.

Key words: comb-liked sand barriers, sand-binding effect, stable concave surface