@article{fdi:010073107,
  title = {{A}erodynamic parameters over an eroding bare surface : reconciliation of the law of the wall and eddy covariance determinations},
  author = {{D}upont, {S}. and {R}ajot, {J}ean-{L}ouis and {L}abiadh, {M}. and {B}ergametti, {G}. and {A}lfaro, {S}. {C}. and {B}ouet, {C}hristel and {F}ernandes, {R}. and {K}halfallah, {B}. and {L}amaud, {E}. and {M}articorena, {B}. and {B}onnefond, {J}. {M}. and {C}hevaillier, {S}. and {G}arrigou, {D}. and {H}enry des {T}ureaux, {T}hierry and {S}ekrafi, {S}. and {Z}apf, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}ssessing accurately the surface friction velocity is a key issue for predicting and quantifying aeolian soil erosion. {T}his is usually done either indirectly from the law of the wall ({L}o{W}) of the mean wind velocity profile or directly from eddy covariance ({EC}) of the streamwise and vertical wind velocity fluctuations. {H}owever, several recent experiments have reported inconsistency between friction velocities deduced from both methods. {H}ere 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. {F}or that purpose a novel field experiment was performed in {S}outh {T}unisia under the research program {WIND}-{O}-{V} ({WIND} er{O}sion in presence of sparse {V}egetation). {W}e 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. {S}urface roughness lengths show a clear increase with wind erosion, with more scattered values when deduced from the {EC} friction velocity. {O}ur measurements further suggest an average value of the von {K}arman 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. {I}mportantly, the von {K}arman constant was found independent of the wind intensity and thus of the wind soil erosion intensity. {F}inally, our results lead to several recommendations for estimating the aerodynamic parameters over bare surface in order to evaluate saltation and dust fluxes.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {A}tmospheres},
  volume = {123},
  numero = {9},
  pages = {4490--4508},
  ISSN = {2169-897{X}},
  year = {2018},
  DOI = {10.1029/2017jd027984},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073107},
}