紧密型栅栏对风沙流影响的实验研究

开展了紧密型栅栏阻沙的野外观测实验,探讨栅栏对风沙流粒度组成及输沙量的影响。结果表明:受栅栏影响风沙流中大粒径沙粒含量降低,小颗粒含量增加;沙粒越过栅栏继续随气流运动的能力与其粒径相关,以0.1mm~0.075mm粒径穿越能力最强,随着粒径的增大或减小这种能力逐渐减弱;粒径1mm的沙粒则很难通过栅栏;沙粒沉积主要发生在在栅栏前端,以粒径0.1mm沙粒为主,占沉积沙土总量的80%强。

Field Experiment Research about Effects of Windtight Fence on the Sand Flux

Effects of the windtight pright fence on particle size distribution and transported sand mass of dritting sand are analyzed by field experiment. The results show that the content of 〉 0. 1 mm sand in the sand flux increases and 〈 0. 1 mm sand decreases for the reason of fence influence. The block effectiveness of upright fence to 0. l mm - 0. 075mm sand is the lowest, to 〉 O. l mm sand increases with the particle sizes augmentation, but to 〈 0. 075mm sand is just converse. Most sand accumulate in front of the fence, and the main accumulated type is fine particles which their diameters are less than 0. lmm and corresponding content is more than 80%.