Comparative study of the shelter efficacy of straw checkerboard barriers and rocky checkerboard barriers in a wind tunnel
Comparative study of the shelter efficacy of straw checkerboard barriers and rocky checkerboard barriers in a wind tunnel
复制标题
稻草棋盘式屏障与岩石棋盘式屏障风洞遮挡效果对比研究
DOI：
10.1016/j.aeolia.2020.100575
复制
发表时间：
2020
期刊：
影响因子：
3.3
通讯作者：
Qinghe Niu
中科院分区：
文献类型：
--
作者：
Tao Wang;Jianjun Qu;Qinghe Niu
为了比较稻草棋盘状屏障 (SCB) 和岩石棋盘状屏障 (RCB) 的遮蔽效果，我们在风洞中测量了与它们相关的流场和沙通量。对于SCB和RCB，棋盘内部形成减速区和流向涡流，并且在棋盘顶部出现加速射流。然而，秸秆和岩石的物质特性存在巨大差异，导致SCB和RCB上的风输送特征不同： 1）SCB上的风速逐渐减小，在第三个棋盘格处达到最小值，然后保持稳定；相比之下，风速在第一个RCB处突然减小并达到最小值，而在第二个和第三个棋盘上风速略有恢复并最终保持稳定。而且，随着速度的增加，SCB内部的减速区逐渐减小，而RCB内部的减速区没有明显减小。 2）在低速度（= 16.0 m/s）下，结果恰恰相反。因此，当风速较低时，SCB 的防沙效率优于 RCB，而当风速较高时，RCB 的防沙效率优于 SCB。研究表明，SCB更适合在弱风地区固沙，RCB更适合在强风地区固沙。
To compare the shelter efficacy of straw checkerboard barriers (SCBs) and rocky checkerboard barriers (RCBs), we measured the flow fields and sand fluxes associated with them in a wind tunnel. For both SCBs and RCBs, a deceleration zone and streamwise vortex formed inside the checkerboards, and an accelerated jet flow emerged at their top. Nevertheless, the material properties of straw and rock are tremendously different, which lead the characteristics of aeolian transport over SCBs and RCBs to be different 1) Wind velocity decreased gradually across SCBs, reached a minimum in the third checkerboard, and then kept stable; in contrast, wind velocity decreased suddenly and reached a minimum in the first RCB, while it then slightly recovered across the second and third checkerboards and finally kept stable. Moreover, the deceleration zone inside the SCBs decreased gradually as the velocity increased, but that inside the RCBs did not obviously decrease. 2) Under low velocities (= 16.0 m/s), the results were just the op- posite. Therefore, the sand stabilization efficiency of SCBs was better than RCBs when wind velocities were low, while the sand stabilization efficiency of RCBs was better than SCBs when wind velocities were high. This study indicates that SCBs are more suitable for sand fixation in weak wind areas, and RCBs are more suitable in strong wind areas.