@article{fdi:010053384,
  title = {{P}rediction of depth-integrated fluxes of suspended sediment in the {A}mazon {R}iver : particle aggregation as a complicating factor},
  author = {{B}ouchez, {J}. and {M}etivier, {F}. and {L}upker, {M}. and {M}aurice, {L}aurence and {P}erez, {M}. and {G}aillardet, {J}. and {F}rance-{L}anord, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{L}arge rivers have been previously shown to be vertically heterogeneous in terms of suspended particulate matter ({SPM}) concentration, as a result of sorting of suspended solids. {T}herefore, the spatial distribution of suspended sediments within the river section has to be known to assess the riverine sedimentary flux. {N}umerous studies have focused on the vertical distribution of {SPM} in a river channel from a theoretical or experimental perspective, but only a few were conducted so far on very large rivers. {M}oreover, a technique for the prediction of depth-integrated suspended sediment fluxes in very large rivers based on sediment transport dynamics has not yet been proposed. {W}e sampled river water along depth following several vertical profiles, at four locations on the {A}mazon {R}iver and its main tributaries and at two distinct water stages. {D}epending on the vertical profile, a one-to fivefold increase in {SPM} concentration is observed from river channel surface to bottom, which has a significant impact on the 'depth-averaged' {SPM} concentration. {F}or each cross section, a so-called {R}ouse profile quantitatively accounts for the trend of {SPM} concentration increase with depth, and a representative {R}ouse number can be measured for each cross section. {H}owever, the prediction of this {R}ouse number would require the knowledge of the settling velocity of particles, which is dependent on the state of aggregation affecting particles within the river. {W}e demonstrate that in the {A}mazon {R}iver, particle aggregation significantly influences the {R}ouse number and renders its determination impossible from grain-size distribution data obtained in the lab. {H}owever, in each cross section, the {R}ouse profile obtained from the fit of the data can serve as a basis to model, at first order, the {SPM} concentration at any position in the river cross section. {T}his approach, combined with acoustic {D}oppler current profiler ({ADCP}) water velocity transects, allows us to accurately estimate the depth-integrated instantaneous sediment flux.},
  keywords = {{A}mazon {R}iver ; suspended particulate matter ; {R}ouse number ; sedimentary ; fluxes ; aggregated},
  booktitle = {},
  journal = {{H}ydrological {P}rocesses},
  volume = {25},
  numero = {5},
  pages = {778--794},
  ISSN = {0885-6087},
  year = {2011},
  DOI = {10.1002/hyp.7868},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053384},
}