直压立式纱网沙障对近地表输沙量及风速的影响  

Influence of gauze sand barrier on sediment transport and wind speed near surface

作　　者：闫德仁[1] 袁立敏[1] 黄海广[1] 胡小龙[1] 杨制国 Yan Deren;Yuan Limin;Huang Haiguang;Hu Xiaolong;Yang Zhiguo(Inner Mongolia Academy of Forestry,Hohhot 010010,China)

机构地区：[1]内蒙古自治区林业科学研究院,内蒙古呼和浩特010010

出　　处：《中国沙漠》2020年第2期79-85,共7页Journal of Desert Research

基　　金：国家重点研发计划项目(2016YFC0501004)。

摘　　要：评价直压立式纱网沙障对流动沙地的固沙效果是其应用的前提。采用阶梯式集沙仪和HOBO风速仪野外测定了纱网沙障的输沙量及风速变化。结果表明:与对照相比,设置纱网沙障后,0~10 cm或0~20 cm高度范围内,带宽2、3、4、5 m带状沙障输沙量分别降低91.4%或89.7%、97.0%或96.4%、98.1%或96.7%、85.9%或84.2%;而2 m×2 m、3 m×3 m、4 m×4 m、5 m×5 m网格沙障输沙量分别降低92.1%或91.2%、70.4%或65.6%、65.3%或65.2%、39.9%或30.0%。与对照相比,10、30、50 cm高度,带宽2、3、4 m带状沙障平均降低风速分别为26.7%、17.3%、11.8%,2 m×2 m、3 m×3 m、4 m×4 m、5 m×5 m网格沙障平均降低风速分别为55.3%、30.4%、23.0%。综合考虑,设置带宽3~4 m带状或网格纱网沙障能够满足工程固沙减少风沙危害的需求。It is a prerequisite for its application to evaluate the sand-fixing effect of gauze sand barriers in moving sandy land.The sediment discharge and change of wind speed of gauze sand barrier have been measured with step-type sand collector and HOBO anemometer in field.The results show that after establishing gauze sand barrier,compared with the control,the sediment discharge of 2 m,3 m,4 m and 5 m strip sand barriers in height range of 0-10 cm or 0-20 cm have decreased by 91.4%or 89.7%,97.0%or 96.4%,98.1%or 96.7%,85.9%or 84.2%,respectively.And the sediment discharge of 2 m,3 m,4 m and 5 m grid sand barriers in height range of 0-10 cm or 0-20 cm have decreased by 92.1%or 91.2%,70.4%or 65.6%,65.3%or 65.2%,39.9%or 30.0%,respectively.Compared with the control,at the height of 10 cm,30 cm and 50 cm,2-4 m strip sand barrier can averagely reduce the wind speed by 26.7%,17.3%and 11.8%,and 2-5 m grid sand barrier can averagely reduce the wind speed by 55.3%,30.4%and 23.0%.By comprehensive consideration,it can meet the needs of reducing the sand damage with sand-fixation engineering to establish 3-4 m strip or grid gauze sand barrier.

关 键 词：沙障 纱网沙障 流动沙地 输沙量 风速 

分 类 号：S157.1[农业科学—土壤学]