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| The Characteristics of Aeolian Transport Particle Size Distribution over the Pebble Artificial Surfaces |
| Zhang Zhengcai, Dong Zhibao |
| Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract Particle size distribution has an important effect on the aeolian material entrainment, transport and deposition. The mechanism of aeolian sediment entrainment, transport distance and mode of deposition are different for different particle size distribution, therefore, the particle size characteristics of aeolian sediment is a good indicator of aeolian sediment. Gobi is an important landscape in the northwest region of China, and aeolian transport in gobi is one of issue in aeolian research. At present, there is little research on gobi aeolian transport, especially on the sand particle size distribution. In this paper, field experiment data in height of 0.25, 0.5, 1 m and 2 m was used to analyze particle size distribution. The results indicate that aeolian sediment supply, surface situation, wind disturbance control particle size distribution with height. (1) Mean particle size decreases with increasing height in longer distance sediment supply, but in shorter distance, mean particle size decreases with increasing height in certain height and then decreases. (2) Larger particle size impact on gravel surface, wind speed change from sand dunes to gravel surface and wind disturbance causes larger particle reach to higher heights. (3) The larger mean particle size, the better sorting, and skewness become more positive, kurtosis become more leptokurtic. Skewness and kurtosis increase with increasing sorting. Kurtosis increases with increasing skewness.
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Received: 30 May 2012
Published: 20 May 2014
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2014, Vol. 34 
