干旱区生态环境知识资源中心(Arid): Aeolian mobility in the Middle Sao Francisco Dune Field, Northeast Brazil, as a response to Caatinga's droughts and land-use changes

Arid

DOI	10.1016/j.geomorph.2021.107940
	Aeolian mobility in the Middle Sao Francisco Dune Field, Northeast Brazil, as a response to Caatinga's droughts and land-use changes
	Santos, Landerlei A.; Latrubesse, Edgardo M.
通讯作者	Santos, LA (corresponding author), Sao Paulo State Univ, UNESP, Inst Geosci & Exact Sci, Rio Claro, Brazil.
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2021
卷号	393
英文摘要	ABS T R A C T In the last decade, the semiarid northeast of Brazil (Caatinga biome) has experienced one of the most prolonged and most severe droughts ever recorded in regional history. The study of the landscape changes contributes to under -standing the environmental, social, and economic consequences of extreme climate events in the region. Here, we investigate the marginal area of the Middle Sao Francisco dune field, where in recent years, aeolian landforms devel-opment and their migration have been observed. To map the migration line of the aeolian front, we used 2002-2019 high-resolution images, from which we estimate the migration rates and evaluate the monthly migration rates for several interannual intervals, particularly during the drought peaks. In the area of greatest migration, the dunes ad-vanced 210 m in 18 years. In the first decade, under climatic conditions closer to the historical average, dunes mi -grated-15 m/y, while in the second decade, they migrated 80 m at a rate of 9.4 m/y. Examining the ranges of intra-annual migrations, we estimate that the highest mobility rate was almost five times greater than the rate at the end of the decade. In addition, we calculated a dune mobility index and the dune's morphological patterns. We conclude that the morphodynamic processes of dune formation and migration were triggered mainly by vege-tation removal from river banks. The more severe climatic conditions during the last drought (2012-2017) enabled the dunes to migrate relatively quickly. The last few years (2017-2019) were marked by a considerable reduction in aeolian mobility and stabilization of expansion margins, inducing the formation of barchan-parabolic dunes. (c) 2021 Elsevier B.V. All rights reserved.
英文关键词	Aeolian dunes Anthropogenic impacts Desertification aridization Aeolian remobilization Sao Francisco River Northeast Brazil
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000709560100004
WOS关键词	PARABOLIC DUNES ; BARCHAN ; DESERTIFICATION ; INDEX ; EAST
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/2XILL650/368171
作者单位	[Santos, Landerlei A.] Sao Paulo State Univ, UNESP, Inst Geosci & Exact Sci, Rio Claro, Brazil; [Latrubesse, Edgardo M.] Fed Univ Goias UFG, CIAMB, Grad Program Environm Sci, Goiania, Go, Brazil
推荐引用方式 GB/T 7714	Santos, Landerlei A.,Latrubesse, Edgardo M.. Aeolian mobility in the Middle Sao Francisco Dune Field, Northeast Brazil, as a response to Caatinga's droughts and land-use changes[J],2021,393.
APA	Santos, Landerlei A.,&Latrubesse, Edgardo M..(2021).Aeolian mobility in the Middle Sao Francisco Dune Field, Northeast Brazil, as a response to Caatinga's droughts and land-use changes.GEOMORPHOLOGY,393.
MLA	Santos, Landerlei A.,et al."Aeolian mobility in the Middle Sao Francisco Dune Field, Northeast Brazil, as a response to Caatinga's droughts and land-use changes".GEOMORPHOLOGY 393(2021).