干旱区生态环境知识资源中心(Arid): A simple model to estimate emission of wind-blown particles from a granular bed in comparison to wind tunnel experiments

Arid

DOI	10.1016/j.geomorph.2019.03.004
	A simple model to estimate emission of wind-blown particles from a granular bed in comparison to wind tunnel experiments
	Ferreira, M. C. S.1,2; Furieri, B.1; El Moctar, A. Ould 3; Harion, J. -L.4; Valance, A.5; Dupont, P.6; Reis, N. C., Jr.1; Santos, J. M.1
通讯作者	Furieri, B.
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2019
卷号	335 页码:1-13
英文摘要	Dust emissions due to aeolian erosion of exposed granular materials are strongly influenced by grain size distribution. Non-erodible particles that are too heavy to be lifted into the air play a protective role in the aeolian erosion process attenuating emission, which is known as the pavement phenomenon. To date, there is no approach that reliably predicts the reduction in emissions caused by their presence on an aggregate surface. In this work, an analytical model was developed to quantify emissions from particle beds with a wide size distribution. As nonerodible particles accumulate, changes in surface characteristics create increasing shelter for the erodible portion of the bed until the shear on the erodible surface reaches a minimum and emissions cease. The proposed emission model describes the relationship between this minimum value of wind shear and the eroded depth of the bed after the pavement, which in turn gives the emitted mass. In addition, wind tunnel experiments were carried out in order to broaden knowledge of the pavement phenomenon and validate the modelling. A bimodal particle size distribution of sand with erodible and non-erodible particles was used for the tested velocities. Three experimental measurements were carried out: (i) continuous weighing of the emitted mass, (ii) eroded depth of the bed at regular time intervals and (iii) final cover rates of the non-erodible particles using digital analysis of sand bed pictures after experiments. Good agreement between the modelling and experimental results was found. The emission model proposed herein is a simple algebraic expression that demands low computational effort. This approach may serve as a base for an emission model for application in granular materials stockpiles. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Wind erosion Non-erodible particles Fugitive emissions Emission model
类型	Article
语种	英语
国家	Brazil ; France
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000466251100001
WOS关键词	AEOLIAN EROSION ; ROUGHNESS ELEMENTS ; DRAG PARTITION ; THRESHOLD ; VELOCITY ; DYNAMICS ; SURFACE ; DESERT ; LENGTH ; SOILS
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/2XILL650/216011
作者单位	1.Univ Fed Espirito Santo, Dept Environm Engn, BR-29075910 Vitoria, ES, Brazil; 2.Inst Fed Espirito Santo, Dept Math, BR-29040780 Vitoria, ES, Brazil; 3.CNRS, UMR 6607, Lab Therm & Energie Nantes, F-44306 Nantes, France; 4.IMT Lille Douai, F-59500 Douai, France; 5.Univ Rennes, CNRS, UMR 6251, Inst Phys Rennes, F-35042 Rennes, France; 6.Univ Rennes, LGCGM, EA3913, F-35042 Rennes, France
推荐引用方式 GB/T 7714	Ferreira, M. C. S.,Furieri, B.,El Moctar, A. Ould,et al. A simple model to estimate emission of wind-blown particles from a granular bed in comparison to wind tunnel experiments[J],2019,335:1-13.
APA	Ferreira, M. C. S..,Furieri, B..,El Moctar, A. Ould.,Harion, J. -L..,Valance, A..,...&Santos, J. M..(2019).A simple model to estimate emission of wind-blown particles from a granular bed in comparison to wind tunnel experiments.GEOMORPHOLOGY,335,1-13.
MLA	Ferreira, M. C. S.,et al."A simple model to estimate emission of wind-blown particles from a granular bed in comparison to wind tunnel experiments".GEOMORPHOLOGY 335(2019):1-13.