Wind Tunnel Experiment of Anti-erosion Efficiency on the Sand Beds Coverd by Different Shapes of Roughness-Elementes
First author:Fan Ruijing(1990-),female,Anyang City, He’nan Province,Master student. Research areas include sandy landform and desertification control.E-mail:frj66xmn@163.com
*Corresponding author:Li Shengyu(1975-),male, Xuanhua City, Hebei Province, Associate Professor. Research areas include sandy landform and desertification control.E-mail:lishy_hb@163.com
Received date: 2016-11-27
Revised date: 2016-12-27
Online published: 2017-01-10
Supported by
Project supported by the National Natural Science Foundation of China “Impact and mechanism of the hinterland of Taklimakan Desert sand bodies on sand erosion process”(No.41571011).
Copyright
In order to study the relationship between the shapes of roughness-elements on sand beds and the surface sand activity inhibition, we chose six shapes of elements including spherical, triangular pyramid shape, cylindrical, square shape, pie and hemispherical shape by hand with equal quality kept. We carried out the experiment with the 10% coverage on the wind tunnel. The results revealed that ① the erosion and anti-erosion rate of spherical, triangular pyramid shape, cylindrical and square roughness-elements were better than the pie and hemispherical on the non-sand wind; ② On the sand-driving wind conditions, spherical, triangular, cylindrical covered beds became erosion to erosion-deposition with the increase of wind speed, and the erosion rate was increased with the wind speed. When the wind speed was more than 10 m/s, the sand-beds showed a strong erosion, and the pie and hemispherical elements’ resistance function were weakest; ③ No matter the non-sand wind or sand wind, the erosion rate was affected by the elements’ aspect ratio, height and spacing. The slender elements with a prominent upper edge were clearly superior to broad rounded elements.
Key words： Geometric shape; Rughness-elements; Wind erosion; Wind tunnel experiment.
Ruijing Fan , Shengyu Li , Jie Zhou , Haifeng Wang . Wind Tunnel Experiment of Anti-erosion Efficiency on the Sand Beds Coverd by Different Shapes of Roughness-Elementes[J]. Advances in Earth Science, 2017 , 32(1) : 83 -89 . DOI: 10.11867/j.issn.1001-8166.2017.01.0083
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