Arid
DOI10.1016/j.catena.2014.06.006
Modeling wind erosion flux and its seasonality from a cultivated sahelian surface: A case study in Niger
Pierre, C.1; Bergametti, G.2; Marticorena, B.2; AbdourhamaneToure, A.3; Rajot, J. -L.4; Kergoat, L.1
通讯作者Pierre, C.
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2014
卷号122页码:61-71
英文摘要

Wind erosion can strongly affect the cultivated areas in semi-arid regions, through soil losses and/or decrease in nutrient contents. Additionally, dust emitted by aeolian erosion affects both the biogeochemical cycles and the Earth radiation budget. Modeling wind erosion and dust emission remains complex especially in semi-arid regions where vegetation interacts with the wind field and may act as a protection of the soil. An existing and widely used wind erosion model is tested in the present study to check the capacity to reproduce observations collected over a millet field and a neighboring bare plot in southwestern Niger during a three-year period. Observations of sediment horizontal fluxes and of vegetation growth and decay show that most of the eroded mass is due to major events occurring at the end of the dry season and at the beginning of the rainy season for the millet field, while erosion also occurs during the dry season for the bare soil plot. Horizontal erosion fluxes were computed with and without obstacles and compared to the measurements. Simulations were found in a good agreement with erosion measurements for both bare and millet plots, in terms of temporal dynamics, reproduction of the major events and annual quantities.


Accumulated horizontal fluxes over the millet plot were found to be much lower than over the bare plot for both observations and simulations (respectively 235 to 565 kg m(-1) y(-1) and 332 to 526 kg m(-1) y(-1) over the millet plot; and 773 to 2692 kg m(-1) y(-1) and 1003 to 1986 kg m(-1) y(-1) for the bare plot). Total values over the 3-year period also show a much stronger (by a factor 3 to 4) wind erosion on the bare plot (5365 kg m(-1) y(-1) for observations, 4548 kg m(-1) y(-1) for simulations) than on the cropped one (1357 kg m(-1) y(-1) for observations, 1398 kg m(-1) y(-1) for simulations). Modeling is therefore able to represent anthropogenic impacts on wind erosion over typical Sahelian surfaces. (c) 2014 Elsevier B.V. All rights reserved,


英文关键词Wind erosion Sahel Cropped surfaces Horizontal flux Drag partition Aerodynamic surface roughness
类型Article
语种英语
国家France ; Niger
收录类别SCI-E
WOS记录号WOS:000341349700006
WOS关键词FRICTION VELOCITY ; DUST EMISSION ; SOIL ; TRANSPORT ; DESERT ; LAND ; VARIABILITY ; COVER ; FIELD ; DRAG
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181312
作者单位1.Univ Toulouse, Geosci Environm Toulouse, CNRS, IRD, F-31400 Toulouse, France;
2.LISA, F-94010 Creteil, France;
3.Univ Abdou Moumouni, Jeune Equipe Associee, IRD, Anthropisat & Dynam Eolienne JEAI ADE,Dept Geol, Niamey, Niger;
4.AgroParisTech, IRD Bioemco, UMR IRD, UPMC,CNRS,ENS,UPEC, F-93143 Bondy, France
推荐引用方式
GB/T 7714
Pierre, C.,Bergametti, G.,Marticorena, B.,et al. Modeling wind erosion flux and its seasonality from a cultivated sahelian surface: A case study in Niger[J]. French National Research Institute for Sustainable Development,2014,122:61-71.
APA Pierre, C.,Bergametti, G.,Marticorena, B.,AbdourhamaneToure, A.,Rajot, J. -L.,&Kergoat, L..(2014).Modeling wind erosion flux and its seasonality from a cultivated sahelian surface: A case study in Niger.CATENA,122,61-71.
MLA Pierre, C.,et al."Modeling wind erosion flux and its seasonality from a cultivated sahelian surface: A case study in Niger".CATENA 122(2014):61-71.
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