关键词: 沙害, 机械措施, 效益, 特征值, 指标值

Abstract: Vegetal dune stabilization is proved very hard at K₁₇₀ section of Qinshui-Luyuan Railway situated in hyperarid area.The suitable way of controlling sand damages is adopting comprehensive mechanical measures.The effectiveness has been proved by the protective effects observed in two years:(1) Compared with shifting sand area,wind speed can be reduced by 76.3% at 20 cm height and sand flux by 0.72% in 0~20 layer under the condition of sand stabilization with straw checkboard fence;(2) with gravel covering sand,the wind speed is reduced by 19.09% and sand flux by 0.09%,which is favorable for sand transporting along road foot;(3) the eigenvalues Q_6~20/Q_0~6 of sand flow under all of the mechanical measures and their integration have reached the effective protection index(Q_6~20/Q_0~6>1).

Key words: Sand damages, Mechanical measures, Effect, Eigenvalue, Index