Pattern analysis of a linear dune field on the northern margin of Qarhan Salt Lake,northwestern China

作     者：LI Jiyan DONG Zhibao QIAN Guangqiang ZHANG Zhengcai LUO Wanyin LU Junfeng WANG Meng 

作者机构：Taiyuan Normal University Jinzhong 030619 China Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 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：670-680页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 

基　　金：funded by the National Basic Research Program of China (2013CB956000) the National Natural Science Foundation of China (41171010,41371102,41301003) 

主　　题：pattern analysis self organization linear dunes dune field Qarhan Salt Lake Qaidam Basin 

摘      要：In terms of formation mechanisms of linear dunes,there are open arguments for their widespread distribution and multi-morphological *** order to clarify the formation mechanism of linear dunes of Qarhan Salt Lake,we used pattern analysis method to analyze the statistical characteristics and spatial variation of their pattern *** at the west-northwest margin,the pattern parameters showed regular spatial variation from the up-middle part towards the downwind end of the dune *** on the cumulative probability plots for inter-crest spacing and crest length,we divided the linear dunes into three groups,which corresponding to the three evolution stages of these *** first group comprises erosional relics,with shorter crests,smaller inter-crest spacing and more random dune *** second group comprises dunes whose sand supply is just sufficient to maintain stability and these dunes are approaching the net erosion *** crest length and inter-crest spacing of these dunes are much larger than those of the first group,and dune orientation is closer to the resultant drift direction （RDD） .The last group comprises linear dunes that are still undergoing vertical accretion and longitudinal elongation,which follows the RDD of the modern wind *** presence of regular spatial variation of pattern parameters and a similar geometry with the vegetated linear dunes suggest that deposition and erosion coexist in the development and evolution of linear dunes of Qarhan Salt Lake,*** predominates at the downwind end of linear dunes in the vertical accretion and longitudinal elongation stage,whereas erosion mainly occurs at the upwind end of linear dunes in the degradation ***,the formation mechanism of linear dunes in Qarhan Salt Lake can be reasonably explained by the combination of depositional and erosional theories.