Because of its low cost and environmental protection characteristics,the straw checkerboard barrier,revered as the"Chinese Rubik's Cube,"is globally recognized as a highly effective method for controlling wind-blown sand owing to its cost-effectiveness and eco-friendly nature.However,it does have a downside:its construction process is labor-intensive and inefficient,requiring experienced workers to manually insert wheat straw into the desert,forming a semi-hidden checkerboard sand barrier.Herein,we introduce an innovative solution designed to address these challenges,namely a mechanically woven brush straw checkerboard barrier.This technology,made from wheat straw,has significantly increased the construction efficiency of straw checkerboard barriers by over 60％.Through both wind tunnel experiments and field observations,we examined the effects of this new brush straw checkerboard barrier on the control of wind-blown sand.Our findings were as follows.(1)Similar to the traditional straw checkerboard barrier,the brush straw checkerboard barrier creates a noticeable airflow deceleration zone and flow vortex inside it,along with a prominent lifting airflow at the top of the sand barrier.When the wind speed is less than 20 m s-1,the sand barrier can reduce wind speed by over 80％.(2)The brush straw checkerboard barrier's impact on wind-blown sand flow mirrors that of the traditional straw checkerboard barrier.As height increases,the sand transport rate within the barrier no longer follows an exponential decrease;instead,it initially rises before falling,reaching its peak at the top of the sand barrier.(3)The sand fixation efficiency(Rs)of the brush straw checkerboard barrier decreases linearly as wind speed increases.However,Rs can still achieve more than 90％in desert areas.These findings suggest that brush straw checkerboard barriers could potentially replace traditional straw checkerboard barriers.They not only reduce workers'labor intensity but also improve construction efficiency.Therefore,this technology offers promising prospects for mechanized weaving and intelligent construction of straw checkerboard barriers.
关键词
草方格沙障/沙漠化治理/风沙流/防沙工程/风洞实验
Key words
straw checkerboard barrier/desertification control/wind-blown sand flow/sand control engineering/wind tunnel experiment
维普
万方数据