摘要
以穿越浑善达克沙地省际通道两侧公路防护带为试验区,以黄柳(Salix gordejevii Y.L.Chang et Skv.)和小红柳(Salix microstachya Turcz.)为主要材料设置的高立式柳条沙障阻沙带和半隐蔽式方格沙障固沙带构成的公路沙障带的防风固沙效益为研究对象,通过对公路两侧不同沙害发生地段的沙障带内风速、输沙量测定,分析风速变化、防风效益和地表粗糙度以及风沙流结构。结果表明:在平缓流沙地、风蚀窝状沙坑、挖方段沙质陡坡等主要公路沙害地段,风速在沙障带带内及其上空,都表现出较强的线形规律,其中沙障带在平缓流沙地风速变化线形规律最强,风速在50m宽的阻沙带中心及固沙带内显著降低,粗糙度渐增,防风效能提高。高立式柳条沙障阻沙带阻聚外源流沙主要发生于阻沙带前锋26m宽范围内,防护带其余近公路54m宽流沙地得到有效控制,表面保持稳定。
The experimental plots was on the two sides of provincial highway throw Otindag Sandy Land in Inner mongolia.Where the Salix gordejevii Y.L.Chang et Skv.and Salix microstachya Turcz.are abundant,they are the primary sand-barrier materials to treate blown sand disaster.The preservation system mainly is composed of sand-fixation belt and shifting-sand-stop belt along the two sides of the road.We analyzed the wind velocities and underlying surface characteristics and the structure of shifting-sands at different landform in the preservation belt by the sandy-transportation rat and wind velocity testing so as to define preservation benefit and the rationality.The results show that the wind velocities in the different landforms,e.g.gentle quicksand land,wind erosion pits and excavation sand-slop,have good linear relationship within preservation system.The linear is the best one in gentle quicksand land,the shifting-snd-stop belt stop the sand within 26 metres width in the front of 50 metres wide shifting-sand-stop belt,the 54 metres wide of the preservation system will be defended.It was the vital fuctional belt which accomplish permanent ecological protection in the preservation system.In the windward side of the sand-slop at wind erosion pit and the top just above the sandy steep slop,wind speeds increased and the sand flow occurred slightly,sand-barrier should be increased to enhance the resisting wind effects and the function of stop-sand,and to avoid potential second blown sand disaster,slop has a significant impact on the wind speed,the subject have to be studied further.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2010年第12期161-166,共6页
Journal of Arid Land Resources and Environment
基金
国级十一五科技支撑项目(2006BAD26B0102)
中德国际科技合作项目(2008DFA32270)资助
关键词
浑善达克沙地
公路沙害
阻沙带
固沙带
防护效益
Otindag sandy land
highway blown sand disaster
shifting-snd-stop belt
sand-fixation belt
preservative effect
