干旱区生态环境知识资源中心(Arid): Characterisation of aeolian sediment accumulation and preservation across complex topography

Arid

DOI	10.1016/j.geomorph.2021.107704
	Characterisation of aeolian sediment accumulation and preservation across complex topography
	Hay, Alex S.; Powell, D. Mark; Carr, Andrew S.; Livingstone, Ian
通讯作者	Carr, AS (corresponding author), Univ Leicester, Sch Geog Geol & Environm, Univ Rd, Leicester LE1 7RH, Leics, England.
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2021
卷号	383
英文摘要	Topography fundamentally influences the distribution and morphology of aeolian landforms via the modification of surface wind flow and the creation of space for sediment deposition. This has been observed at both landform (individual topographic dune forms) and macro-landscape (sand sea) scales. Although previous studies have considered several aspects of the impact of topography on aeolian landforms, the patterns of landscape-scale aeolian sediment accumulation that emerge at the meso-scale, within topographically complex environments have received less consideration. To address this, we present an approach that combines information on the presence of surficial sand (via remote sensing) with the morphometric feature classification method, LandSerf. Using the Cady Mountains in the Mojave Desert as a case study, we explore the relationships between sand cover and topographic indices over length scales of 10(2)-10(3) m. Field observations are then used to refine our understanding of these patterns. Aeolian deposits across the Cady Mountains are strongly controlled by the topography. Although sand cover is often continuous and highly variable in depth, four archetypal accommodation space types are identified from the morphometric analysis: Slopes, Plains, Valley-Fills, and Slope-Valley composite. Specific aeolian land -forms within these accommodation spaces may manifest as sand ramps and climbing -falling dunes, particularly on mountain front Slopes, and as sand sheets on downwind Plains within the mountain block. In areas of high sediment supply these may also coalescence, as exemplified by the extensive and compositionally complex Slope-Valley composites in the northern Cady Mountains. In conjunction with field observations, we argue that topography, moderated by proximity to sediment supply, strongly influences the character of the aeolian sedimentary record. However, even within the relatively complex landscape studied here, 90% of the mapped sand accumulation is associated with the four identified accommodation space types. The implication is that areas of such complex topography are amenable to analysis within the scheme outlined and that this can potentially be used to support interpretations of accompanying dune chronologies. (C) 2021 The Author(s). Published by Elsevier B.V.
英文关键词	LandSerf Mojave Desert Sand ramp Climbing dune DEM
类型	Article
语种	英语
开放获取类型	Green Accepted, hybrid
收录类别	SCI-E
WOS记录号	WOS:000640909900006
WOS关键词	DIGITAL ELEVATION MODELS ; SAND RAMPS ; MOJAVE-DESERT ; KELSO DUNES ; LATE PLEISTOCENE ; AFTON CANYON ; CALIFORNIA ; CLASSIFICATION ; GEOMORPHOLOGY ; MORPHOLOGY
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/2XILL650/350414
作者单位	[Hay, Alex S.; Powell, D. Mark; Carr, Andrew S.] Univ Leicester, Sch Geog Geol & Environm, Univ Rd, Leicester LE1 7RH, Leics, England; [Livingstone, Ian] Univ Northampton, Grad Sch, Northampton NN1 5PH, England
推荐引用方式 GB/T 7714	Hay, Alex S.,Powell, D. Mark,Carr, Andrew S.,et al. Characterisation of aeolian sediment accumulation and preservation across complex topography[J],2021,383.
APA	Hay, Alex S.,Powell, D. Mark,Carr, Andrew S.,&Livingstone, Ian.(2021).Characterisation of aeolian sediment accumulation and preservation across complex topography.GEOMORPHOLOGY,383.
MLA	Hay, Alex S.,et al."Characterisation of aeolian sediment accumulation and preservation across complex topography".GEOMORPHOLOGY 383(2021).