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              <p>River  plumes  play  a  central  role  in  the  input  and  transport  of  dissolved  and  particulate matters  that  can  lead  to  the  dispersion  of  pollutants  into  coastal  waters.  Understanding  the dynamics  of  river  plumes  is  thus  essential  to  evaluate  the  potential  threat  to  coastal-marine ecosystems,  in  order  to  improve  management  and  mitigation  policies.  The  Adour  estuary morphology combined with the competition between the tide and the river flow result in a partially stratified estuary. A dual approach, coupling field experiments and numerical modeling, has been carried  out  to  better  understand  the  physical  processes  that  govern  the  Adour  river  plume hydrodynamics. A field campaign was performed inside the estuary in September 2017. Velocity profilers and high frequency point current-meters were moored, at two different stations inside the estuary,  during one  month.  Series  of  salinity  profiles  were  realized  at  four  stations  including mooring stations. Meanwhile, a numerical model has been developed based on the open source code TELEMAC-3D to investigate the interaction between light continental waters and heavy salty marine  waters,  focusing  on  the  salt-wedge  intrusion  inside  the  estuary.  The  resulting  density stratification playing a  major role in the transfer of water masses  and the transport of dissolved and particulate matters, its precise reproduction isone of the cornerstones of our study. Inside the estuary,  a  competition  between  density  gradient  and  velocity/bottom  shear  regulates  mixing processes.  First  comparisons  between  model  and  field  data  show  a  good  agreement  between measured and simulated water levels and velocity profiles. The correct representation of density stratification  processes  by  the  numerical  model  remains,  as  expected,  a  challenging  issue.  The choice of the turbulence model, which is of the foremost importance for a good representation of the interaction between water masses, will be discussed within the physical framework provided by field measurements</p>
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