Rôle des sédiments organiques sur le fonctionnement hydrodynamique des bassins d’infiltration d’eaux pluviales

Abstract : This study aimed to evaluate the influence of organic sediment deposits on the hydrodynamic functioning of the Cheviré stormwater retention-infiltration basin (44). Physical and chemical characterization of the sediments, underlying soil of the basin, and sediment organic matters were undertaken. Sediments influence on the soil transfer properties were then evaluated by an experiment at the soil column scale and by a numerical simulation at the basin scale. Organic matters of the Cheviré basin had a small degradation capacity, which explained their large concentrations in sediments. These large levels of organic matters favored a large water retention capacity of sediments but led to a decrease of their infiltration capacity. This decrease may be induced on the one hand by a highly hydrophobic behavior of sediments, especially to anthropogenic organic matters such as polycyclic aromatic hydrocarbons, and on the other hand, by a closure of sediment macroporosity. Conversely, sediment microporosity became increasingly important and favored water retention. Simulations showed that combined effects of (i) the sediments accumulation at the basin soil surface, (ii) the gradual decrease of sediment porosity, and (iii) the increase of sediment hydrophobicity, explained the decrease of the basin infiltration capacity and the increase of the frequency of overflows in the basin during aging.
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Anaïs Coulon. Rôle des sédiments organiques sur le fonctionnement hydrodynamique des bassins d’infiltration d’eaux pluviales. Sciences de l'environnement. INSTITUT SUPERIEUR DES SCIENCES AGRONOMIQUES, AGRO-ALIMENTAIRES, HORTICOLES ET DU PAYSAGE, 2012. Français. ⟨tel-01203123⟩

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