| 沙漠与沙漠化 |
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| Study on Wind-tunnel Simulated Flow Pattern over Nabkha in Hetian River Basin,Xinjiang (Ⅰ) |
| LI Zhi-zhong1, WU Sheng-li1,2, XIAO Chen-xi1, SUN Qiu-mei1, LIU Li-mei1, ZHANG Zhong-hua1 |
| 1.School of Life and Environmental Sciences, Xinjiang Normal University, Urumqi 830054, China; 2.School of Resources and Environmental Sciences, East China Normal University, Shanghai 200062, China |
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Abstract Nabkha dune is a kind of typical aeolian landform. The wind power, sand source and plant are the mainly influencing factors of the development of nabkha. In this paper, two models of sand mounds without vegetation were made in 40∶1 proportion in wind tunnel, according to similarity theory in wind-sand movement experiments, and on the base of Nabkha data surveyed in the Hetian river basin in Xinjiang. The experimental wind speed are separately 6, 8, 10, 12, 14 m\5s-1. The flow pattern over semispherical sand mound model showed that obvious reflected vortex appeared at the upwind bottom influenced by facade wind pressure, and there was eroded region by strong wind at the top of sand mound. In contrast, the airflow increased equably along the upwind slope of conical sand mound, and vortex at leeward side was very strong. The structure of pure airflow pattern and the dynamic equilibrium point of dune shape are different between semispherical and conical of sand mound.
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Received: 12 September 2005
Published: 20 January 2007
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2007, Vol. 27 
