%0 Conference Proceedings %T Dissolution in a porous rock: effect on the concentration–discharge relationships %+ Institut de Physique du Globe de Paris (IPGP) %+ Études des Structures, des Processus d’Adaptation et des Changements de l’Espace (ESPACE) %+ Tianjin Key Laboratory of Water Resources and Environment %A Devauchelle, O %A Métivier, F %A Lajeunesse, E %A Gaillardet, J %A Didon-Lescot, Jean-François %A Liu, Youcun %A Ye, Baisheng %< avec comité de lecture %( River, Coastal and Estuarine Morphodynamics: RCEM2011 %B River, Coastal and Estuarine Morphodynamics %C Beijing, China %8 2011 %D 2011 %Z Sciences of the Universe [physics]/Earth Sciences/GeomorphologyConference papers %X Various empirical or physically-based theory have been proposed to understand how the solute concentration of a stream varies with the discharge. We focus here on the influence of the dynamics of the groundwater flow on the chemical erosion rate. To do so, we couple a one-dimensional aquifer model to a first order dissolution equation. If the aquifer extends far below the stream level, the theoretical discharge–concentration equation corresponds to the empirical " working model " proposed by Johnson in 1969, thus providing a physical interpretation of its parameters. Conversely, if the aquifer lays mainly above the stream level, a significantly different relationship is found. These theoretical findings are then compared to two field-data sets. From this comparison, we conclude that the dynamics of the groundwater flow could play a significant role in moderating the impact of dilution on the stream concentration at large discharges. %G English %2 https://u-paris.hal.science/hal-01501292/document %2 https://u-paris.hal.science/hal-01501292/file/B1013_Devauchelle.pdf %L hal-01501292 %U https://u-paris.hal.science/hal-01501292 %~ INSU %~ UNICE %~ UNIV-PARIS7 %~ UNIV-AVIGNON %~ AFRIQ %~ CNRS %~ UNIV-AMU %~ IPGP %~ ESPACE %~ GIP-BE %~ UNIV-COTEDAZUR %~ SORBONNE-UNIVERSITE %~ UNIV-PARIS %~ SU-TI %~ ALLIANCE-SU