干旱区生态环境知识资源中心(Arid): 戈壁沙砾质地表沉积物全粒径分布模式及其对分选作用的指示意义

Arid

	戈壁沙砾质地表沉积物全粒径分布模式及其对分选作用的指示意义
其他题名	Particle Size Distribution Models of Gobi Sediments and Its Significance to the Effect of Sorting
	熊鑫 1; 王海兵 1; 肖建华 2; 左合君 1
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2019
卷号	39 期号:2 页码:202-208
中文摘要	戈壁地表沉积物组分呈多峰态分布的特征,研究其全粒径分布模式是认识戈壁成因及形成过程的基础。目前粒度分布模式(对数正态分布、Weibull分布等)难以正确表达呈多峰态的沉积物粒度分布特征,本文利用单调递减函数P(di)= Cd-mu i exp(-di/Dc),对戈壁地表沉积物粒度的全粒径分布模式进行解析。结果表明:(1)该函数能够反映出戈壁地表沉积物组分的全粒径分布特征,拟合优度R~2 >0.99,参数C值范围为52.64~ 166.75,mu为-0.083~ 0.108,Dc为0.103~ 2.336;(2)在分选作用下,以富沙组分为主的戈壁地表,跃移组分含量高,mu值、Dc值偏小,以富砾组分为主的戈壁地表,蠕移及风蚀残余组分含量高,mu值、Dc值偏大;(3)全粒径分布模式参数值可以揭示洪积扇戈壁的分选沉积特征,为解析戈壁地表的成因以及风蚀风积作用提供新的指标参数。
英文摘要	Studying particle size distribution models is the basis for understanding the formation process of gobi. However, the frequency distribution of surface sediment components in gobi desert are characterized by multimodal, and the general particle size distribution function with Log-normal or Weibull distribution are difficult to be used to correctly express the particle size distribution characteristics of sediments with multimodal. Therefore, this study was designed to analyze the particle size distribution of the gobi surface sediments using the monotonicaly decreasing function P(di) =Cd-mu i exp(-di/Dc). The results showed that this function was able to reflect the particle size distribution characteristics of gobi surface sediment components with the goodness of fit as R~2 >0.99. The range of parameter C was 52.64-166.75, mu was 0.083-0.108, and Dc was 0.103-2.336. Under the effect of sorting, the components for jumping movement was large with relatively small mu and Dc values in sand-rich surface of gobi. The residual components for wind-induced erosion and creep movement was large with relatively large mu and Dc values in gravel-rich surface of gobi. The parameters using particle size model can reveal the sorting sedimentary characteristics of alluvial fan gobi and provide a new indicating parameter for analyzing the formation process of gobi surface and the wind-induced erosion.
中文关键词	粒度组分 ; 全粒径分布模式 ; 沙砾质地表 ; 戈壁
英文关键词	particle size components particle size distribution model sandy gravelly surface gobi
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:6460482
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239783
作者单位	1.内蒙古农业大学沙漠治理学院, 内蒙古风沙物理与防沙治沙工程重点实验室, 呼和浩特, 内蒙古 010011, 中国; 2.中国科学院西北生态环境资源研究院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	熊鑫,王海兵,肖建华,等. 戈壁沙砾质地表沉积物全粒径分布模式及其对分选作用的指示意义[J]. 内蒙古农业大学,2019,39(2):202-208.
APA	熊鑫,王海兵,肖建华,&左合君.(2019).戈壁沙砾质地表沉积物全粒径分布模式及其对分选作用的指示意义.中国沙漠,39(2),202-208.
MLA	熊鑫,et al."戈壁沙砾质地表沉积物全粒径分布模式及其对分选作用的指示意义".中国沙漠 39.2(2019):202-208.