干旱区生态环境知识资源中心(Arid): 乌兰布和沙漠西北缘大型沙波纹的初步研究

Arid

	乌兰布和沙漠西北缘大型沙波纹的初步研究
其他题名	A preliminary study of large-scale ripples in the northwest margin of Ulanbuh Desert
	李鹤; 丁占良; 尤莉; 韩广
来源期刊	干旱区资源与环境
ISSN	1003-7578
出版年	2020
卷号	34 期号:9 页码:129-136
中文摘要	文中选择乌兰布和沙漠西北边缘的大型沙波纹(LSR)作为研究对象,通过野外考察、实地观测、采样和室内测试分析和遥感影像分析等手段,对LSR的空间格局、形态特征、沉积物的粒度特征和成因进行了初步研究。结果表明:(1)因地貌部位的不同,LSR的长度、高度和间距有明显差异,沙丘迎风坡上LSR的长度和间距不存在显著相关性,而丘间洼地和灌丛沙包区则相关性显著;(2)LSR脊部以粗砂和极粗砂为主,分选性最好,脊间小洼地/浅槽以细砂、中砂为主,而沙丘迎风坡表层以中砂和粗砂为主,其下部以中砂为主,分选性最差。(3)LSR是在强劲的盛行风作用下,洪积扇中下部含有粗砂和砾石的松散堆积物长期分选和堆积的产物,属于微型横向风积形态;(4)LSR与普通沙波纹在形态和成因方面有很大的相似性,但两者在空间上是不相容的,即同一场风作用下后者不会出现在前者之上和之间;(5)从扇顶到扇缘,LSR的分布呈带状排列,空间规模最大、发育最典型的部位在中部缓起伏沙丘区和新月形沙丘链区,这种空间格局主要是由洪积扇上的物质分异规律所控制。
英文摘要	In this paper,large-scale ripples(LSR)in the northwest margin of the Ulanbuh Desert in Dengkou county,Inner Mongolia,were taken as study area,and the characteristics of their spatial patterns,morphology and grain size along with their causes were analyzed by means of field investigation,measurement,sampling and indoor analysis as well as remote sensing imagery analysis.The results show that:(1)There are significant differences in the length,height,and spacing of LSR due to variable flow fields at different positions of certain landforms,and there are no significant correlations between the length and spacing of LSR on the stoss of dune, while significant on those in interdune blowouts and the nebkha fields.(2)The summit of the LSR is mainly composed of coarse and very coarse grains, sometimes even gravels,which has the best sorting,and those at troughs or little depressions between ridges are principally comprised by fine and medium grains;the surface of stoss is dominated by medium sand and coarse sand,and its underlying strata are dominated by medium sand, which its average size is the thinnest and their sorting the worst.(3)LSR is the product of long-term winnowing and accumulation of loose deposits of both coarse sand and gravel in the middle and lower parts of the pluvial fan under the action of violent prevailing winds,being a type of micro-scale transverse aeolian form by deposition.(4)There are more resemblances between LSRs and common ripples,they are spatially incompatible,i.e.the latter not occurring generally upon and between LSR under a single heavy wind event.(5)The distribution of LSRs assumes a zonal pattern from the apex of fan to the margin,of which those most extensive and best-developed are lying in the middle and lower portions of pluvial fan wherein appear low-relief irregular and large barchanoid dunefields,the unique spatial pattern is chiefly governed by the law of sedimentary differentiation on the fan.
中文关键词	乌兰布和沙漠 ; 大型沙波纹 ; 粒度特征 ; 盛行风 ; 洪积扇
英文关键词	the Ulanbuh Desert large-scale ripple grain size composition prevailing winds pluvial fan
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6779585
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336768
作者单位	李鹤, 湖南师范大学资源与环境科学学院, 长沙, 湖南 410081, 中国.; 韩广, 湖南师范大学资源与环境科学学院, 长沙, 湖南 410081, 中国.; 丁占良, 包头师范学院资源与环境学院, 包头, 内蒙古 014030, 中国.; 尤莉, 内蒙古自治区气候中心, 呼和浩特, 内蒙古 010051, 中国.
推荐引用方式 GB/T 7714	李鹤,丁占良,尤莉,等. 乌兰布和沙漠西北缘大型沙波纹的初步研究[J],2020,34(9):129-136.
APA	李鹤,丁占良,尤莉,&韩广.(2020).乌兰布和沙漠西北缘大型沙波纹的初步研究.干旱区资源与环境,34(9),129-136.
MLA	李鹤,et al."乌兰布和沙漠西北缘大型沙波纹的初步研究".干旱区资源与环境 34.9(2020):129-136.