Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2017JD027984 |
Aerodynamic Parameters Over an Eroding Bare Surface: Reconciliation of the Law of the Wall and Eddy Covariance Determinations | |
Dupont, S.1; Rajot, J-L.2,3,4,5; Labiadh, M.3; Bergametti, G.4,5; Alfaro, S. C.4,5; Bouet, C.2,4,5; Fernandes, R.1; Khalfallah, B.4,5; Lamaud, E.1; Marticorena, B.4,5; Bonnefond, J-M.1; Chevaillier, S.4,5; Garrigou, D.1; Henry-des-Tureaux, T.2; Sekrafi, S.3; Zapf, P.4,5 | |
2018-05-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:9页码:4490-4508 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Tunisia |
英文摘要 | Assessing accurately the surface friction velocity is a key issue for predicting and quantifying aeolian soil erosion. This is usually done either indirectly from the law of the wall (LoW) of the mean wind velocity profile or directly from eddy covariance (EC) of the streamwise and vertical wind velocity fluctuations. However, several recent experiments have reported inconsistency between friction velocities deduced from both methods. Here we reinvestigate the determination of aerodynamic parameters (friction velocity and surface roughness length) over an eroding bare surface and look at the possible reasons for observing differences on these parameters following the method. For that purpose a novel field experiment was performed in South Tunisia under the research program WIND-O-V (WIND erOsion in presence of sparse Vegetation). We find no significant difference between friction velocities obtained from both law of the wall and EC approaches when the friction velocity deduced from the EC method was extrapolated to the surface. Surface roughness lengths show a clear increase with wind erosion, with more scattered values when deduced from the EC friction velocity. Our measurements further suggest an average value of the von Karman constant of 0.407 0.002, although individual wind events lead to different average values due probably to the definition of the ground level or to the stability correction. Importantly, the von Karman constant was found independent of the wind intensity and thus of the wind soil erosion intensity. Finally, our results lead to several recommendations for estimating the aerodynamic parameters over bare surface in order to evaluate saltation and dust fluxes. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000434132400006 |
WOS关键词 | ATMOSPHERIC BOUNDARY-LAYER ; MONTE-CARLO-SIMULATION ; FLUX MEASUREMENTS ; TURBULENCE ; CONSTANT ; STRESS ; UNCERTAINTY ; PROFILES ; GRAINS ; FLOW |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33540 |
专题 | 气候变化 |
作者单位 | 1.Bordeaux Sci Agro, INRA, ISPA, Villenave Dornon, France; 2.Univ Paris Diderot, Univ Paris Est Creteil, Sorbonne Univ,CNRS,INRA, iEES Paris,Inst Ecol & Sci Environm Paris,UMR IRD, Bondy, France; 3.IRA Medenine, Medenine, Tunisia; 4.Univ Paris Est Creteil, CNRS, UMR 7583, LISA,IPSL, Creteil, France; 5.Univ Paris Diderot, CNRS, UMR 7583, LISA,IPSL, Creteil, France |
推荐引用方式 GB/T 7714 | Dupont, S.,Rajot, J-L.,Labiadh, M.,et al. Aerodynamic Parameters Over an Eroding Bare Surface: Reconciliation of the Law of the Wall and Eddy Covariance Determinations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(9):4490-4508. |
APA | Dupont, S..,Rajot, J-L..,Labiadh, M..,Bergametti, G..,Alfaro, S. C..,...&Zapf, P..(2018).Aerodynamic Parameters Over an Eroding Bare Surface: Reconciliation of the Law of the Wall and Eddy Covariance Determinations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(9),4490-4508. |
MLA | Dupont, S.,et al."Aerodynamic Parameters Over an Eroding Bare Surface: Reconciliation of the Law of the Wall and Eddy Covariance Determinations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.9(2018):4490-4508. |
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