阿拉尔-和田沙漠公路机械防沙体系内风沙沉积的粒度特征  

Grain-size characteristics in the physical sand protection system of the Alar-Hetian desert highway

作　　者：王世杰[1,2] 李生宇[1] 徐新文[1] 罗小刚 邢文渊[4] 

机构地区：[1]中国科学院新疆生态与地理研究所,乌鲁木齐830011 [2]中国科学院大学,北京100049 [3]和田公路管理局,和田848000 [4]新疆气候中心,乌鲁木齐830002

出　　处：《干旱区资源与环境》2014年第6期130-135,共6页Journal of Arid Land Resources and Environment

基　　金：新疆维吾尔自治区重大科技专项课题(201130106-3);新疆维吾尔自治区科技支疆项目计划(201291106);中国科学院知识创新工程青年方向项目(KZCX2-YW-QN-316);新疆维吾尔自治区交通科研项目(2010-10)资助

摘　　要：对阿拉尔-和田沙漠公路沿线机械防沙体系内外地表风沙沉积物进行了系统采样,运用沉积物的粒度分析方法,以流沙区为对照,对比分析了沙漠公路机械防沙体系中阻沙区和固沙区内风沙沉积物的粒度特征。研究发现:(1)从流沙区到阻沙区,再到固沙区,风沙沉积物的粗砂、中砂含量逐渐降低,极细砂、粉砂含量逐渐增加,阻沙区内风沙沉积物的平均粒径减小了31.0%,固沙区内风沙沉积物的平均粒径减小了47.2%。(2)流沙区、阻沙区和固沙区内蠕-跃截点的平均值分别为1.296Φ、1.647Φ、2.188Φ,跃-悬截点的平均值分别为3.893Φ、4.089Φ、4.292Φ,各运动组分的截点均向细端偏移,并且各运动组分的含量也发生了变化,阻沙区和固沙区内蠕移组分含量分别降低了2.378%、5.837%,悬移组分含量分别增加了4.26%、4.294%。(3)固沙区沙粒的分选性最好,偏度SK的平均值为-0.059,表现为近对称,峰态KG为0.939-0.987,表现为中等峰态。Sand samples were collected systematically in the section of physical sand break system along the Arar - Hetian desert highway in the Taklimakan Desert and the grain - size characteristics of the samples in the mov- ing sand, fence area and straw checkerboard area were studied. The results can be seen as follows ： （ 1 ） Compared with the moving sand, in the fence and straw checkerboard area coarse particle content decreases, mighty fine sand content increases, even contain clay composition, the mean grainsize is only 25.57 -45.68%. The cutoff point of rolling - saltation components and suspension - saltation components respectively are 1.50 - 1. 92Ф and 3.63 -4.08Ф,gradually near to the thin end of the particle size. The contents of rolling and sahation components decrease about 2 - 5% and 4 - 5 % respectively, suspension components increases about 9%. （2） The change in straw checkerboard area is greater than in fence area, the mean grain - size is 0.218mm in moving sand, but respectively 0. 165mm and 0. llTmm in fence and straw checkerboard area.

关 键 词：阿和公路 防沙体系 风沙沉积物 粒度 

分 类 号：S727.23[农业科学—林木遗传育种]