干旱区生态环境知识资源中心(Arid): The control of wind strength on the barchan to parabolic dune transition

Arid

DOI	10.1002/esp.4881
	The control of wind strength on the barchan to parabolic dune transition
	Zhang, Deguo; Liang, Peng; Yang, Xiaoping; Li, Hongwei
通讯作者	Zhang, DG
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2020
卷号	45 期号:10 页码:2300-2313
英文摘要	The evolution of barchan-to-parabolic dunes can be driven by vegetation establishment, which may be linked to climate change and/or human activity. However, little is known of the impact of changes in wind strength on vegetation development and the resulting impacts on the evolution of dune morphology and sedimentological characteristics. To address this issue, we studied the morphology and grain-size characteristics of barchan, barchan-to-parabolic and parabolic dunes in the Mu Us Desert in north China, which was combined with an analysis of changes in normalized difference vegetation index (NDVI) and climatic variables during 1982-2018. The results reveal a trend of increasing growing-season NDVI which was related to a significant decrease in drift potential (DP). Therefore, we suggest that the initiation of dune transformation was caused by the reduced wind strength which favored the establishment and development of vegetation. To reveal the response of sedimentological reorganization during the processes of dune transformation, grain-size characteristics along the longitudinal profile of the three different types of dunes were examined. The decreasing wind strength led to the transport of fine sands on the upper part of the windward face of the dunes, resulting in a progressive coarsening of the grain-size distribution (GSD) and a reduction in dune height at the crest area. No distinct trend in sorting and mean grain-size was observed on the windward slope of the barchan-to-parabolic dune, indicating that the sand in transit had little influence on the GSD. Conversely, progressive sorting and coarsening of the sand occurred towards the crest of the parabolic dune. This indicates that vegetation development limited the transport of sand from upwind of the dune, and affected a shift in the dune source material to the underlying source deposits, or to reworked pre-existing aeolian deposits, and resulted in the trapping of sand in the crest area. (c) 2020 John Wiley & Sons, Ltd.
英文关键词	wind strength NDVI sedimentological reorganization Mu Us Desert barchan to parabolic dune transition
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000556044700006
WOS关键词	PARTICLE-SIZE VARIATION ; GRAIN-SIZE ; SAND DUNE ; NORTHERN CHINA ; STOSS SLOPE ; AIR-FLOW ; SOUTHWEST KALAHARI ; VEGETATION CHANGES ; TRANSVERSE DUNE ; INCIPIENT PHASE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325439
作者单位	[Zhang, Deguo; Liang, Peng; Yang, Xiaoping; Li, Hongwei] Zhejiang Univ, Sch Earth Sci, Key Lab Geosci Big Data & Deep Resource Zhejiang, Hangzhou 310027, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Deguo,Liang, Peng,Yang, Xiaoping,et al. The control of wind strength on the barchan to parabolic dune transition[J],2020,45(10):2300-2313.
APA	Zhang, Deguo,Liang, Peng,Yang, Xiaoping,&Li, Hongwei.(2020).The control of wind strength on the barchan to parabolic dune transition.EARTH SURFACE PROCESSES AND LANDFORMS,45(10),2300-2313.
MLA	Zhang, Deguo,et al."The control of wind strength on the barchan to parabolic dune transition".EARTH SURFACE PROCESSES AND LANDFORMS 45.10(2020):2300-2313.