Simulative research on the mechanism of rocky checkerboard sand barriers along Qinghai-Tibet Railway in wind tunnel
Received date: 2009-06-11
Revised date: 2010-01-13
Online published: 2010-03-10
Supported by
Characteristics of wind-blown sand under the lower air pressure and mechanism of sand hazards along Qinghai-Tibet Railway
Based on the simulative research on the characteristics of wind speed, sand-fixed rate of rocky checkerboard sand barriers along Qinghai-Tibet Railway in wind tunnel, several conclusions were drawn as follows. Horizontal wind speed rapidly decreases when it flows to the fringe of rocky checkerboard sand barriers. Weaken efficiency of rocky checkerboard sand barrier on airflow is distinct, with about 50%. Wind speed changes little over rocky checkerboard sand barrier. In contrast, although the wind speed decreases from rocky checkerboard sand barrier to its lower reach, its magnitude is very small. Wind speed varies logarithmically with height. Variation of wind speed is similar among rocky checkerboard sand barriers as height increases. Roughness is about 5.2 mm and drag velocity is 2.4 cm/s for rocky checkerboard sand barrier. Sand-fixing mass increased with inlet wind speed. For a given wind speed, sand-fixing mass increased exponentially with distance to sand sources.
ZHANG Ke-Cun . Simulative research on the mechanism of rocky checkerboard sand barriers along Qinghai-Tibet Railway in wind tunnel[J]. Advances in Earth Science, 2010 , 25(3) : 284 -289 . DOI: 10.11867/j.issn.1001-8166.2010.03.0284
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