水土保持学报2011，Vol.25Issue(5)：26-29,34,5.
塑料网方格沙障对新月形沙丘迎风坡的风沙流影响
Effects of Plastic Checkerboard Sand-Barrier on Wind-Sand Flux of Leeward of Crescentic Dune
摘要
Abstract
The sand barrier is one of methods to break wind and control sand,because the environment is harsh in arid area with less water resource.The plastic checkerboard sand-barrier was set on the leeward of crescentic dune,and some index,such as wind velocity,transported quantity of sand,shape of surface of sand-land,depth of erosion and breakage ratio of sand barrier were observed.The results showed that：The wind velocity was decreased when the plastic checkerboard sand-barrier was set on the leeward of crescentic dune.The wind velocity decreased 75% than that of CK at height of 20 cm above the barrier at the bottom of leeward of dune,which was the decreased maximal number that were observed and compared with the decreased number of wind velocity at the position,such as the bottom,middle and upper of leeward of dune,as well as the aeolian depth and deposition of sand.The function was logarithmic equation between wind velocity and height,and the height of 40 cm was an inflection point where wind velocity changed significantly.The wind velocity at bottom was less than that of middle and upper of dune leeward,and the wind velocity of middle and upper of dune was 1.18~2.01 times comparing with that of bottom of dune.The height,where the transported quantity of sand was maximum,was 10~20 cm,and the ratio of sand volume was 60.57% at the observed time at the bottom of dune,as well as 69.11% and 91.20% at middle and upper of dune leeward.A concave profile was formed in the plastic checkerboard barrier when the sandy surface was stable,but the forming process was deferent comparing with the forming process of concave profile of straw checkerboard barrier.The plastic checkerboard barrier was an accumulating barrier.The broken ratio of barrier was much larger than that of middle and upper of dune leeward.It was attention that the plastic checkerboard barrier was set at the middle and upper of dune leeward.关键词
塑料网方格沙障/新月形沙丘迎风坡/风沙流Key words
plastic checkerboard barrier/leeward of crescentic dune/wind-sand flux分类
资源环境引用本文复制引用
刘虎俊,王继和,李毅,马瑞,孙涛,朱国庆,张莹花..塑料网方格沙障对新月形沙丘迎风坡的风沙流影响[J].水土保持学报,2011,25(5):26-29,34,5.基金项目
甘肃省自然科学基金项目 （）
甘肃省科技重大专项 （）
