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中国沙漠 ›› 2000, Vol. 20 ›› Issue (1): 40-44.

• 论文 • 上一篇    下一篇

复膜沙袋阻沙体与芦苇高立式方格沙障防沙机理风洞模拟实验

韩致文, 刘贤万, 姚正义, 邵国胜   

  1. 中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000
  • 收稿日期:1999-03-10 修回日期:1999-06-18 出版日期:2000-03-20 发布日期:2000-03-20
  • 作者简介:韩致文(1963-),男(汉族),甘肃会宁人,副研究员,硕士,主要从事风沙地貌与沙漠化防治研究工作。

Wind Tunnel Test on Sand preventing Mechanism of Double-filmed Sand bag Obstacle and Upright Checkerboard Sand-barrier

HAN Zhi-wen, LIU Xian-wan, YAO Zheng-yi, SHAO Guo-sheng   

  1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:1999-03-10 Revised:1999-06-18 Online:2000-03-20 Published:2000-03-20

摘要: 模型按1:10比例尺设计,在u=7.0 m·s-1u=10.0 m·s-1u=15.0 m·s-1实验风速下,先在纯气流作用下测定流场结构,然后在风沙流作用下测定蚀积状况。实验结果表明:紧密型、疏透型和通风型3种不同结构的复膜沙袋阻沙体前近处分布有拐角阻滞绕流区、阻沙体顶下方抬升加速区、阻沙体后回流区、阻沙体后贴地层低速回流区等流场特征结构,紧密型、疏透型两种类型复膜沙袋阻沙体防风阻沙效果显著;2.5 m×2.5 m、5 m×5 m和10 m×10 m的高立式芦苇方格前沿流速逐渐增大,最大值出现于迎风第一格上空,而后逐渐阻滞减速,至15~20 m处趋于稳定,区内积沙均匀。复膜沙袋阻沙体与原状芦苇高立式方格沙障适宜于流动性沙漠地区各种设施的沙害防治工程。

关键词: 复膜沙袋阻沙体, 高立式方格沙障, 防沙工程, 流场结构, 蚀积状况

Abstract: The model was designed with 1:10 scale,and the testing wind velocity consist of 7.0 m·s-1,10 m·s-1and 15.0 m·s-1.The structure of flow field was measured under wind only,then,the erosion deposition features were measured under sand-carrying wind flow.The results are as follows:(1) Near the 3 types obstacles of tight,sparse and air,there are some structural characteristics of retardant periptery before the body,lifting accelerating area just pass the top,back-flow area behind the body,and low-speed back-flow area on the surface behind the body.The tight and sparse sand bag obstacles have obvious sand-preventing effect.(2) The rulers of upright checkerboard sand barriers include 2.5 m×2.5 m,5 m×5 m,10 m×10 m.The sand-carrying wind speeds up gradually when it flows to the objects,and reachs the maximun over the first checkerboard;then,the speed decreases gradually resulted from the stopping function of the objects;the flow trends stable after 15~20 m course,and sands deposite evenly.The test proved that the double filmed sand bag obstacle and initial upright checkerboard sand barrier are effective for protecting all the facilities in sand-shifting desert areas.

Key words: double-filmed sand bag obstacle, upright checkerboard sand barrier, sand-controlling engineering, structure of flow field

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