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	巴丹吉林沙漠沙山粒度组成与沙山地貌分带
其他题名	Particle Size Composition and Geomorphology Zoning of the Megadune in the Badain Jaran Desert
	邵天杰; 赵景波; 董治宝
来源期刊	山地学报
ISSN	1008-2786
出版年	2013
卷号	31 期号:4 页码:434-441
中文摘要	为查明巴丹吉林沙漠东南部沙山的成因与发育机制,在沙山密集分布的中心地区选择典型高大沙山作为研究对象,将单个沙山的物质组成与地貌分带相结合进行系统、定量的研究。通过粒度分析获得了沙山不同剖面、不同部位沉积物的粒度组成和各粒级含量的变化等数据,并进一步探讨了粒度组成和含量变化与沙山地貌分带、形成风动力条件之间的相互关系。得出以下主要结论:1.巴丹吉林沙漠沙山粒度组成为粗粉砂、极细砂、细砂、中砂、粗砂。其中细砂含量最高,中砂、粗砂次之,极细砂和粗粉砂含量均较少。2.沙山迎风坡表层沉积物的粒度比迎风坡下层和背风坡表层要粗,其搬运介质的平均动能也最大。3.从沙山坡脚到坡顶粒度组成均呈现由粗变细的趋势,这是由它们的形成过程和受到的动力作用存在差异决定的。4.沙山迎风坡不同部位的坡度、沙丘类型与分布在纵向上存在明显差异,可将其分为风蚀粗化的平沙洼地带、稀疏简单的新月形沙丘或沙丘链带、密集叠置的新月形沙丘及沙丘链带、陡峭的主峰带等4个地貌带。5.组成沙山的风沙物质不是一次搬运到达沙山中上部的,而是经过了多次的风力搬运阶段才达到的。
英文摘要	In order to find out the formation and developmental mechanism of megadune,an emblematic megadune in the densely distributed central area in the southeastern Badain Jaran Desert was chosen as the study object. Using a combination of the material composition and physiognomy zonations of a single megadune to research the forma- tions of megadune systematically and quantificationally. Method of particle size analysis was used to obtain the data of physiognomy zonations at the windward slope,sediment size composition at the different parts of megadune. Ac- cording to these data,further discuss the relationship between sediment size composition and landform zoning char- acteristics of megadune windward slope and wind dynamic conditions at different parts of megadune. Some results were drawn as follows: 1. the particle size of megadune was comprised by coarse silt,very fine sand,fine sand, medium sand and coarse sand. The content of the fine sand was the highest,followed by the medium sand and coarse sand,the very fine sand and coarse silt were less. 2. The particle size of sediment on surface layer of wind- ward slope was thicker than that on sublayer of windward slope and surface layer of leeward slope,and its average kinetic energy of transportation medium also was maximal. 3. The sediment particle size became smaller from the bottom to the top of the slope,which was caused by the differences of forming prpcess and dynamic effect. 4. Ac- cording to the observational data of secondary physiognomy,the windward slope of megadune was divided into low- lying sandy depression zones,sparse simple barchans or barchanoid chains zoning,dense barchans and barchanoid chains zoning and steep main peak zoning from the bottom up. 5. That aeolian sand material was not carried to the middle and upper part of megadune one time,but carried to the upper part of megadune by numerousness wind- force transport. Firstly,medium sand and fine sand in the lower of megadune was carried to the middle part,and shaped barchan and barchanoid chains. After repeatedly transport,finally the peak of megadune was shaped.
中文关键词	沙山形成 ; 地貌分带 ; 粒度成分 ; 巴丹吉林沙漠
英文关键词	megadunes formed geomorphology zoning particle size composition Badain Jaran Desert
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:4970036
来源机构	陕西师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229943
作者单位	陕西师范大学旅游与环境学院, 西安, 陕西 710062, 中国
推荐引用方式 GB/T 7714	邵天杰,赵景波,董治宝. 巴丹吉林沙漠沙山粒度组成与沙山地貌分带[J]. 陕西师范大学,2013,31(4):434-441.
APA	邵天杰,赵景波,&董治宝.(2013).巴丹吉林沙漠沙山粒度组成与沙山地貌分带.山地学报,31(4),434-441.
MLA	邵天杰,et al."巴丹吉林沙漠沙山粒度组成与沙山地貌分带".山地学报 31.4(2013):434-441.