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| Wind tunnel test on effect of controlling windand deposited sand of geogrid sand-barrier |
| Dong Zhi1,Li Hongli1,Wang Ji2,Ding Guodong3,Sun Baoping3 |
| 1.College of Forestry,Shandong Agriculture University,271018,Tai'an,Shandong;2.College of Ecology and Environment Science,Inner Mongolia Agriculture University,010019,Huhhot;3.College of Soil and Water Conservation,Beijing Forestry University,100083,Beijing: China |
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Abstract The model was designed with 1∶10 scale,and the testing wind velocity consisted of 7 m/s,15 m/s and 20 m/s.Effect of controlling wind and deposited sand of geogrid sand-barrier with different size and porosity was measured under wind tunnel test.The results are as follows: The trend of wind flow field is same to different size geogrid barriers,there shaped four speed-down regions and three speedup regions before,inside and after barriers.It was the preventing mechanism of barriers to decrease wind speed and deposit sands before and after barriers.And the wind speedup region of middle barriers provided occasion for no or less deposited sand in barriers middle.The fence function increase because of barriers be joined,and the shifting sand can be effectively controlled inner the barriers system.To the same size barrier,the thickness of deposited sand increased with wind velocity,and decreased with the distance to sand source.The thickness of deposited sand decreased with size and porosity to different size barriers.The thickness of deposited sand have notable difference to different size barriers with different wind speed.According to the deposited sand depth and the preventing intention,the best ability of deposition of sand-barrier was 10 cm×10 cm scale,10 cm×20 cm was better,and 20 cm×20 cm was worst.Furthermore,It need to be considered various factors such as cost,fence objective and sand source so on when designed and setting geogrid barriers.
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Received: 24 June 2006
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