干旱区生态环境知识资源中心(Arid): 柴达木盆地耙状线形沙丘沉积物粒度特征及其对沙丘形成的意义

Arid

	柴达木盆地耙状线形沙丘沉积物粒度特征及其对沙丘形成的意义
其他题名	The sediment characteristics of the featured dunes in Qaidam Basin and its implications on dunes formation
	郭岐山; 丁小军
来源期刊	干旱区资源与环境
ISSN	1003-7578
出版年	2020
卷号	34 期号:3 页码:196-203
中文摘要	耙状线形沙丘是一种新发现的沙丘类型,形态上既有线形沙丘特征,又有新月形沙丘的特征,但目前对该类沙丘的研究相对较少,从而限制了对此沙丘的认识。为此 ,文中选择柴达木盆地的耙状线形沙丘为研究对象,收集地表沉积物样品,探讨沉积物粒度特征,为阐明沙源对耙状线形沙丘的形态演化过程提供支撑。研究表明, 受砾石覆盖和盐分的影响,该地区的沙源欠丰富。耙状线形沙丘粒度具有明显的空间差异。在沙丘断面上,脊线最细,且迎风坡坡脚比背风坡粗。分选系数随平均粒径变细而变好,偏度随风选变好而趋于正偏。除分选系数与峰度相关性较差外(R~2=0.37,P=0.1),其余所有的粒度参数之间均有明显相关性(P <0.001)。沉积物粒度的空间差异反映了沙源和沉积物搬运过程的差异。综合风况、沉积物和下垫面特征,研究区沙丘物源包括戈壁和干涸湖盆,其中蠕移质主要来源于戈壁,而跃移质则敖阔戈壁和干涸湖盆。
英文摘要	Featured dunes is newly found dune types in the Kumtagh Desert,which has both linear dunes and barchan dunes properties.During our recent field investigations,we found they distribute in the Qaidam Basin.The little research of these dune type has limited our knowledge of these dunes.Wind regime,sediment supplement and underling properties are the main factors influencing the dune formation and development.However,for different dune types,there effect is different.Therefore,we selected the featured dunes in the Qaidam Basin and collected sediment from dune surface to analyze grain size parameters,and to explain these dune formation and development.The results indicated that the Qadidam featured dunes developed in the limited sediment supplement conditions for the gravel coverage and salt.The sediment characteristics (mean grain size,sorting,skewness and kurtosis) are different in different dune surface transections and locations of the featured dunes.Mean grain size is the finest at the crest,and also finer at the windward than leeward.Except the relationship between sorting and kurtosis (P=0.1),all other grain size parameters are related to each other (P <0.001).The spatial characteristics of sediment reflect the difference of sediment supplement and transport.Based on the wind regime,sediment grain size and underling properties,we can derive that the sources of the featured dunes are from Gobi and dry lake,the coarser sand are from near-distance Gobi surface,and the finer sand are from Gobi surface and upwind dry lake.
中文关键词	柴达木盆地 ; 耙状线形沙丘 ; 沉积物 ; 粒度参数
英文关键词	Qaidam Basin featured dunes sediment grain size parameters
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Environmental Sciences & Ecology
CSCD记录号	CSCD:6712567
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353548
作者单位	郭岐山, 青海省核工业地质局, 西宁, 青海 810008, 中国. 丁小军, 青海省核工业地质局, 西宁, 青海 810008, 中国.
推荐引用方式 GB/T 7714	郭岐山,丁小军. 柴达木盆地耙状线形沙丘沉积物粒度特征及其对沙丘形成的意义[J],2020,34(3):196-203.
APA	郭岐山,&丁小军.(2020).柴达木盆地耙状线形沙丘沉积物粒度特征及其对沙丘形成的意义.干旱区资源与环境,34(3),196-203.
MLA	郭岐山,et al."柴达木盆地耙状线形沙丘沉积物粒度特征及其对沙丘形成的意义".干旱区资源与环境 34.3(2020):196-203.