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Journal of Arid Land  2016, Vol. 8 Issue (5): 722-733    DOI: 10.1007/s40333-016-0016-9     CSTR: 32276.14.s40333-016-0016-9
Research Articles     
Grain size distribution at four developmental stages of crescent dunes in the hinterland of the Taklimakan Desert, China
JIA Wenru1, ZHANG Chunlai1*, LI Shengyu2, WANG Haifeng2, MA Xuexi2,3, WANG Ningbo2
1 State Key Laboratory of Earth Surface Processes and Resource Ecology, Ministry of Education Engineering Center of Desertification and Blown-sand Control, Beijing Normal University, Beijing 100875, China;
2 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
3 Xinjiang Academy of Forestry Science, Urumqi 830046, China
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Abstract  Although scientists have performed many studies on crescent (barchan) dunes in the Taklimakan Desert, few studies reported the changes in grain size at different development stages of crescent dunes. In order to evaluate the changing trends of surface sediment grain size with dune development, we investigated the grain size characteristics at four developmental stages (oval sand pile, shield dune, incipient crescent dune and mature crescent dune) of crescent dunes by measuring the morphology of sand dune and observing the near-surface wind regime. The dunes have developed in a wide inter-dune corridor between high compound longitudinal ridges in China’s Taklimakan Desert. The surface sediments at four developmental stages of the crescent dunes were primarily composed of fine sands, followed by very fine and medium sands. Mean grain sizes ranged from 2.8 to 3.1 φ, with a unimodal distribution. The sands were moderately well-sorted, their distribution varied from platykurtic to very platykurtic, and symmetrical or skewed towards the fine particles. From oval sand piles through shield and incipient crescent dunes to mature crescent dunes, incipient grain size gradually increased, particles became finer, sorting became better, kurtosis and skewness increased. Grain sizes on the surface layer became coarser upwards from the toe of the windward slope and then became finer towards the bottom of the leeward slope. We found that the coarsest particles at different positions at the four developmental stages were different. The coarsest particles were distributed at the top of the oval sand piles and shield dunes, versus at the middle of the windward slope of the incipient and mature crescent dunes. Correlations between the mean grain size and other grain size parameters showed that as mean grain size became finer, sorting became better and kurtosis became wider, but skewness changed only slightly. In addition, grain size variation in the surface sediments correlated with the movement speed of the dunes in the study area. In the open ground among tall-complex longitudinal ridges in the hinterland of the Taklimakan Desert where aeolian environment is characterized by comparatively strong wind and unsaturated sand flow, faster dune movement corresponded to coarser grain size.

Key wordsclimate variability      drought      standardized precipitation index      Antakya      Kahramanmara?      Turkey     
Received: 26 December 2015      Published: 15 June 2016
Fund:  

This research was supported by the National Natural Science Foundation of China (41571011, 41330746).

Corresponding Authors:
Cite this article:

JIA Wenru, ZHANG Chunlai, LI Shengyu, WANG Haifeng, MA Xuexi, WANG Ningbo. Grain size distribution at four developmental stages of crescent dunes in the hinterland of the Taklimakan Desert, China. Journal of Arid Land, 2016, 8(5): 722-733.

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http://jal.xjegi.com/10.1007/s40333-016-0016-9     OR     http://jal.xjegi.com/Y2016/V8/I5/722

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