摘要
棉秆沙障具有原材料丰富,设置形式灵活多样,无污染等优点。在流沙上设置了植入式、栅栏式、集束式3种结构类型、6种规格的棉秆沙障,观测各沙障对近地表风速的影响,以及沙障内沙粒运动及沙面形态变化。结果表明:各种结构和规格的棉秆沙障均可在一定程度上增大地表粗糙度,降低近地表风速,减缓障内沙粒运动,降低输沙量。其中,带枝叶植入式行列沙障防风固沙效果最好,但稳定性较差,易于倒伏;栅栏式格状沙障防护效果次之,从100cm到10cm的风速降幅为75%,近地表10cm处风速仅为流沙上风速的33%,沙障稳固,维护量小。具体设置棉秆沙障时,其结构与规格的选择可根据当地的风沙流强度确定。
Cotton haulm sand barriers have the advantages of rich in raw materials,setting flexibly with diverse forms,no pollution and so on.Set up three types,six specs of cotton haulm sand barriers on shifting sand,observed the impaction on wind speed,movement of sand grain,as well as configuration of sand surface.The results showed：the sand barriers with different structures and dimensions all can increase the ground roughness,decrease the wind velocity and sand transport rate,and abate the sand movement.Thereof,the row sand barriers constructed form cotton haulm with branches and leaves have the best protective effects,but it has a low stability and tend to fall down;the fence sand barriers in checkerboard pattern have the protective effect that is next only to the former,the wind speed reduced by 75% from height 100 cm to 10 cm,and the wind speed at a height of 10 cm only is 33% of that above the shifting sand,besides,the fixedness of this type of sand barriers only bring little maintenance.In practice,the cotton haulm sand barriers should be installed in proper structure and dimension according to the characteristics of local sand flow field.
出处
《水土保持学报》
CSCD
北大核心
2010年第2期48-51,共4页
Journal of Soil and Water Conservation
基金
国家"十一五"科技攻关项目(2006BAD26B08)
甘肃省重大专项(0702NKDH030)
甘肃省开发专项(0805TCYH027)
科技部省部会商项目(2007BAD46B02)
关键词
棉秆沙障
防护效益
野外观测
cotton haulm sand barrier
protective effect
field observation
