塔里木沙漠公路试验段防沙工程效益分析

The Protective Efficiency of the Drifting Sand Devil Controlling System along the Test Section of Tarim Desert High-way

塔克拉玛干沙漠石油公路试验路段风沙流流场结构观测表明:(1)草方格外露高度在15—20cm,就能有效控制风沙流;(2)在风速大致相同时,相同地貌部位上草方格固沙区输沙率只有流沙区的数千分之一;(3)当风沙流通过阻沙栅栏时能量被重新分配并急剧衰减,达到有效阻沙目的;(4)在其它条件一定时路基的零断面和弧形断面是较理想的过沙断面;路堤式断面的路基高度要适当控制并加强边坡防护。

After field observation on the vertical distribution of the drifting sands along the 2km test section of Tarim Highway for transporting oil, we reached the following conclusion. (1) Straw-checkboard barriers which have exposed height of 15—20cm are effective enough to prevent sand drift; (2) Given roughly the same wind speed, sand transport rate in of straw-checkboard system area is only one thousandsth of that shiftting sand area; (3) Energy is drastically reduced and redistributed around fences, therefore sand devil is effectively controlled; (4) Given that the other surface conditions area are the same, flat and arc roadbed profiles are the most ideal for sand passing, the elevation of roadbed with embankment profile should be properly limited and the side slope protection be intensified.