River Flow 2020 Estimation of the transverse mixing coefficients in shallow gravel-bedded rivers
In: RIVERFLOW 2020 - 10th Conference on Fluvial Hydraulics ; https://cea.hal.science/cea-02972575 ; RIVERFLOW 2020 - 10th Conference on Fluvial Hydraulics, IAHR (International Association for Hydro-Environment Engineering and Research), Jul 2020, DELFT, Netherlands, 2020
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Zugriff:
International audience ; 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.
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River Flow 2020 Estimation of the transverse mixing coefficients in shallow gravel-bedded rivers
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Autor/in / Beteiligte Person: | Gond, L. ; Mignot, Emmanuel ; Le Coz, J. ; Kateb, L. ; CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ; Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA) ; École Centrale de Lyon (ECL) ; Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) ; Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) ; RiverLy - Fonctionnement des hydrosystèmes (RiverLy) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) ; IAHR (International Association for Hydro-Environment Engineering and Research) |
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Zeitschrift: | RIVERFLOW 2020 - 10th Conference on Fluvial Hydraulics ; https://cea.hal.science/cea-02972575 ; RIVERFLOW 2020 - 10th Conference on Fluvial Hydraulics, IAHR (International Association for Hydro-Environment Engineering and Research), Jul 2020, DELFT, Netherlands, 2020 |
Veröffentlichung: | HAL CCSD, 2020 |
Medientyp: | Konferenz |
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