Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s40333-015-0005-4 |
Grain-size characteristics of linear dunes on the northern margin of Qarhan Salt Lake, northwestern China | |
Li Jiyan; Dong Zhibao; Zhang Zhengcai; Qian Guangqiang; Luo Wanyin; Lu Junfeng | |
通讯作者 | Li Jiyan |
来源期刊 | JOURNAL OF ARID LAND |
ISSN | 1674-6767 |
EISSN | 2194-7783 |
出版年 | 2015 |
卷号 | 7期号:4页码:438-449 |
英文摘要 | In order to clarify the formation mechanism of linear dunes on the northern margin of Qarhan Salt Lake, northwestern China, we analyzed the grain-size and sorting parameters of the dune and interdune sands. The surface sands (0-30 mm) from the dune base to the crest of both flanks and interdune corridors were sampled along transects from upwind to downwind through the dune field. The results indicated that the grain-size distribution differed at different positions between and within the dunes. The frequency curve for dune sands mainly showed a bimodal distribution, while the interdune sediments showed a trimodal distribution. The grain size distribution of the linear dunes showed a finer crest pattern, i.e. the crests were composed of sands that were generally finer, better sorted than those of base sands. In addition, at the dune field scale, the dune crest sands were tending to become much finer but sorting became worse along the downwind transects. However, the grain-size parameters of sediments in the interdune corridors showed no clear pattern. The results demonstrated that the grain size and sorting parameters exhibited a systematic change not only at the individual scale but also at the dune field scale. Our results quantitatively estimate the limited role of cohesive sediments on the formation of linear dune under unidirectional wind regime. More attention should be paid to a long-term wind regime observation, internal sedimentary structures and their formation ages. |
英文关键词 | linear dune longitudinal dune grain-size parameters Qarhan Salt Lake Qaidam Basin |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000353213300003 |
WOS关键词 | LONGITUDINAL DUNES ; DESERT ; TITAN ; KALAHARI ; AUSTRALIA ; ORIGINS ; MARS |
WOS类目 | Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | 中国科学院西北生态环境资源研究院 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/188399 |
作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China |
推荐引用方式 GB/T 7714 | Li Jiyan,Dong Zhibao,Zhang Zhengcai,et al. Grain-size characteristics of linear dunes on the northern margin of Qarhan Salt Lake, northwestern China[J]. 中国科学院西北生态环境资源研究院,2015,7(4):438-449. |
APA | Li Jiyan,Dong Zhibao,Zhang Zhengcai,Qian Guangqiang,Luo Wanyin,&Lu Junfeng.(2015).Grain-size characteristics of linear dunes on the northern margin of Qarhan Salt Lake, northwestern China.JOURNAL OF ARID LAND,7(4),438-449. |
MLA | Li Jiyan,et al."Grain-size characteristics of linear dunes on the northern margin of Qarhan Salt Lake, northwestern China".JOURNAL OF ARID LAND 7.4(2015):438-449. |
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