@article{fdi:010079499,
  title = {{B}uoyancy effects in the turbulence kinetic energy budget and reynolds stress budget for a katabatic jet over a steep {A}lpine slope},
  author = {{C}harrondiere, {C}. and {B}run, {C}. and {S}icart, {J}ean-{E}mmanuel and {C}ohard, {J}. {M}. and {B}iron, {R}omain and {B}lein, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{K}atabatic winds are very frequent but poorly understood or simulated over steep slopes. {T}his study focuses on a katabatic jet above a steep alpine slope. {W}e assess the buoyancy terms in both the turbulence kinetic energy ({TKE}) and the {R}eynolds shear-stress budget equations. {W}e specifically focus on the contribution of the slope-normal and along-slope turbulent sensible heat fluxes to these terms. {F}our levels of measurements below and above the maximum wind-speed height enable analysis of the buoyancy effect along the vertical profile as follow: (i) buoyancy tends to destroy {TKE}, as expected in stable conditions, and the turbulent momentum flux in the inner-layer region of the jet below the maximum wind-speed height z(j); (ii) results also suggest buoyancy contributes to the production of {TKE} in the outer-layer shear region of the jet (well above z(j)) while consumption of the turbulent momentum flux is observed in the same region; (iii) {I}n the region around the maximum wind speed where mechanical shear production is marginal, buoyancy tends to destroy {TKE} and our results suggest it tends to increase the momentum flux. {T}he present study also provides an analytical condition for the limit between production and consumption of the turbulent momentum flux due to buoyancy as a function of the slope angle, similar to the condition already proposed for {TKE}. {W}e reintroduce the stress {R}ichardson number, which is the equivalent of the flux {R}ichardson number for the {R}eynolds shear-stress budget. {W}e point out that the flux {R}ichardson number and the stress {R}ichardson number are complementary stability parameters for characterizing the katabatic flow apart from the region around the maximum wind-speed height.},
  keywords = {{B}uoyancy production ; {F}lux and stress {R}ichardson numbers ; {K}atabatic jets ; {S}teep alpine slope ; {T}urbulence kinetic energy ; {FRANCE} ; {ALPES} ; {BELLEDONNE} {MASSIF}},
  booktitle = {},
  journal = {{B}oundary-{L}ayer {M}eteorology},
  volume = {177},
  numero = {1},
  pages = {97--122},
  ISSN = {0006-8314},
  year = {2020},
  DOI = {10.1007/s10546-020-00549-2},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079499},
}