Grain size distribution at four developmental stages of crescent dunes in the hinterland of the Taklimakan Desert,China

作     者：JIA Wenru ZHANG Chunlai LI Shengyu WANG Haifeng MA Xuexi WANG Ningbo 

作者机构：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 Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Xinjiang Academy of Forestry Science Urumqi 830046 China 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2016年第8卷第5期

页      面：722-733页

核心收录：

学科分类：0710[理学-生物学] 02[经济学] 0202[经济学-应用经济学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0201[经济学-理论经济学] 0709[理学-地质学] 020106[经济学-人口、资源与环境经济学] 0708[理学-地球物理学] 09[农学] 0815[工学-水利工程] 0705[理学-地理学] 0903[农学-农业资源与环境] 

基　　金：supported by the National Natural Science Foundation of China (41571011 41330746) 

主　　题：crescent dune developmental stage grain size Taklimakan Desert 

摘      要：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 *** 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 *** dunes have developed in a wide inter-dune corridor between high compound longitudinal ridges in China＇s Taklimakan *** surface sediments at four developmental stages of the crescent dunes were primarily composed of fine sands,followed by very fine and medium *** grain sizes ranged from 2.8 to 3.1 φ,with a unimodal *** sands were moderately well-sorted,their distribution varied from platykurtic to very platykurtic,and symmetrical or skewed towards the fine *** 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 *** 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 *** found that the coarsest particles at different positions at the four developmental stages were *** 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 *** 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 *** addition,grain size variation in the surface sediments correlated with the movement speed of the dunes