新疆S214省道防沙体系对近地表风沙流的影响

对新疆S214省道台特玛湖干涸湖盆段防沙体系内外的风沙流输沙和风速进行了同步观测,数据分析表明：观测时防沙体系中阻固沙带已拦截了大量风沙,虽近地表风速被削弱程度不大,但风沙流输沙的43.26%仍可被防沙体系所拦截和固定,而剩余部分则可借助路侧输沙带的较大风力输移到公路下风侧,且不产生路面沙害,表明阻-固-输结合型防沙体系非常适宜单风向强风沙环境。S214省道防沙实践可为其他强风沙环境公路防沙提供重要借鉴经验。

Influence of sand control system on aeolian sand flow near the ground surface in Provincial Highway 214 in Xinjiang Uygur Autonomous Region

Traffic line is an important infrastructure, and aeolian sand activity is a crucial threat to traffic safety. Sand disaster prevention and control is essential for road construction in arid regions. After 1949, China has conducted several road sand disaster control works in arid and semiarid regions and accumulated extensive sand control technology and experience. However, the road sand disaster control in strong wind and sandy areas is less successful than that in other areas. Provincial Highway S214 in the dry lake basin section of Taitema Lake in Xinjiang Uygur Autonomous Region, China is located in such a typical aeolian environment. In recent years, new highway sand prevention projects have been implemented, and the road sand damage has been well controlled. This study investigates the effectiveness of the new sand control system. Synchronous observation of the sand transport via wind flow and wind speed using the sand control system showed that a large amount of aeolian sand was intercepted in the sand-blocking and sand-fixing belts of the sand control system, and the wind speed near the ground surface remained strong. However, 43.26% of the sand transport can still be intercepted and fixed by the sand control system, and the rest can be moved to the downwind side of the highway by the large wind in the sand-transporting belt without damaging the road surface sand. These results showed that the sand control system with its combined resistance and solid transport is suitable for the strong sand environment with unidirectional wind in the Taitema Lake dry lake basin. This aeolian sand prevention practice serves an important reference for highway sand prevention in other areas with strong aeolian environment.