%0 Conference Paper %F Oral %T River Flow 2020 Estimation of the transverse mixing coefficients in shallow gravel-bedded rivers %+ CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)) %+ Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA) %+ RiverLy - Fonctionnement des hydrosystèmes (RiverLy) %+ Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) %A Gond, L. %A Mignot, Emmanuel %A Le Coz, J. %A Kateb, L. %< avec comité de lecture %B RIVERFLOW 2020 - 10th Conference on Fluvial Hydraulics %C DELFT, Netherlands %8 2020-07-07 %D 2020 %K River %K mixing %Z Physics [physics]/Nuclear Theory [nucl-th] %Z Physics [physics]/Nuclear Experiment [nucl-ex]Conference papers %X Transverse mixing coefficients are key parameters for predicting pollutant dispersion in rivers. While most studies deal with river reaches considered homogeneous, the literature review indi-cates that shallow, gravel-bedded rivers with a longitudinally-varied bed morphology are still poorly documented. The motivation of the present work is that the transverse mixing coeffi-cient in rivers with varied hydraulic parameters could be estimated with a succession of coeffi-cients of more homogeneous sub-reaches. This work applies a 1D-diffusion model to estimate these local transverse mixing coefficients from several local injections. Slug injections of Rho-damine WT are performed at various locations of the Durance River, France. Cross-profiles of tracer concentration at selected cross-sections delineating as homogeneous as possible sub-reaches are measured using fluorometers located near the bed. In addition, hydraulic data are derived from ADCP measurements. Best-fitting solutions of the 1D-diffusion model against the measurements suggest substantial variations of the transverse mixing coefficient between con-secutive sub-reaches. %G English %2 https://cea.hal.science/cea-02972575/document %2 https://cea.hal.science/cea-02972575/file/riverflow_submission0325_estimation_of_the_transverse_mixing_coefficients_in_shallow_gravel-bedded_rivers-2.pdf %L cea-02972575 %U https://cea.hal.science/cea-02972575 %~ CEA %~ CNRS %~ UNIV-LYON1 %~ INSA-LYON %~ EC-LYON %~ LMFA %~ DSV %~ DEN %~ CEA-DRF %~ INSA-GROUPE %~ UDL %~ UNIV-LYON %~ INRAE %~ INRAE-AQUA %~ RIVERLY %~ RESEAU-EAU