Spatial Distribution of Grain Size in Aeolian Flow in Nylon Net Checkerboard Barrier

doi:10.7522/j.issn.1000-694X.2016.00110

JOURNAL OF DESERT RESEARCH ›› 2018, Vol. 38 ›› Issue (1): 76-84.DOI: 10.7522/j.issn.1000-694X.2016.00110

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Spatial Distribution of Grain Size in Aeolian Flow in Nylon Net Checkerboard Barrier

Li Xiaojuan^1,2, Zhou Zhibin¹, Li Ning³, Lu Jingjing¹, Ding Xinyuan⁴, Zhu Hai¹, Wang Lijie¹

1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Soil and Water Conservation Monitoring Station of Xinjiang Production and Construction Corps, Urumqi 830011, China;
4. College of Resources Science & Technology, Beijing Normal University, Beijing 100875, China

Received:2016-07-08 Revised:2016-08-17 Online:2018-01-20 Published:2018-01-20

Abstract

Abstract: The research on grain size is of great importance in aeolian geomorphology. On one hand, grain size characteristics of the surface sediments not only reflects the wind for transporting and sorting but also records the wind strength formation of the aeolian process. On the other hand, it embodies that terrain and other obstacles have made a big change on the sand flow transport processes. Thus, studying the spatial distribution of grain size in aeolian flow in the hinter land of Taklimakan Desert is extremely important. To reveal spatial distribution of grain size in aeolian flow, two kinds underlying surface, bare sandy land and nylon net checkerboard barrier, were selected in this study. Using two kinds of sand collectors (one was set to observe sand flow in the vertical height, the other was set to observe sand flow in the horizontal direction) to measure sediment runoff of sand flow in 2-100 cm and 16 directions. And then the grain size of sand samples was analyzed by BT-2001 Laser grain size analyzer. The results show that the shape of frequency distribution curves of grain size is unimodal. In the vertical height, the average grain size of sand grains at the L1 and L2 decreases with the increase of height. At L3 average grain size increase before it is stable. With the degree of depth in the sand barrier, sorting is worse; skewness increase, kurtosis reduces. With the decreasing of mean grain size, sorting is deteriorating. The thin tail of frequency distribution curves becomes more and more obvious. Grain size distribution is narrowed at the L1 and L2. At L1 the change rate of mean grain-size to standard deviation, skewness, kurtosis is greater than at L2. In the horizontal direction, the average grain size of sand have the first increase after a decrease during T1-T2-T3. At T2, sorting is the best, skewness and kurtosis are minimum. Size parameters and the average particle diameter have no significant correlation in the three points.

Key words: nylon net checkerboard barrier, wind sand flow, spatial distribution of grain size

CLC Number:

P931.3

Li Xiaojuan, Zhou Zhibin, Li Ning, Lu Jingjing, Ding Xinyuan, Zhu Hai, Wang Lijie. Spatial Distribution of Grain Size in Aeolian Flow in Nylon Net Checkerboard Barrier[J]. JOURNAL OF DESERT RESEARCH, 2018, 38(1): 76-84.

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Spatial Distribution of Grain Size in Aeolian Flow in Nylon Net Checkerboard Barrier

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