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                <title xml:lang="en">Macrolitter transfer by urban stormwater: emission and influencing factors</title>
                <title xml:lang="fr">Transfert de macrodéchets par les eaux pluviales urbaines : taux de fuite et facteurs d'influence</title>
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                  <title>Novatech 2023</title>
                  <date type="start">2023-07-03</date>
                  <date type="end">2023-07-07</date>
                  <settlement>Lyon</settlement>
                  <country key="FR">France</country>
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              <keywords scheme="author">
                <term xml:lang="fr">Bassin de rétention</term>
                <term xml:lang="fr">Flux</term>
                <term xml:lang="fr">mMcroplastiques</term>
                <term xml:lang="fr">Milieu urbain</term>
                <term xml:lang="fr">Ruissellement</term>
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            <abstract xml:lang="en">
              <p>Urban areas and activities that take place there can constitute a major source of macrolitter, including microplastic litter, potentially transferred by stormwaters towards the environment. Nevertheless, few studies quantified and characterized macrolitter inputs from urban areas and little information are available on the factors that influence these fluxes. This study therefore aims at quantify macrolitter emission transferred by stormwater at the outlet of two urban watersheds at Nantes agglomeration and to evaluate the parameters regulating these emissions. In this context, the macrolitter accumulated at the stormwater outlet were collected during one year. The collected items were weighted, characterized, some were traced and fluxes were compared to the densities of macrolitter on the urban surfaces to evaluate a transfer rate in stormwater. A high variability of emissions illustrates a non-linear transfer of macrolitter depending on several factors (hydrometeorological factors, item’s typology, urban developments). Macrolitter leakages are low compared to the densities on the urban surfaces but plastics are the more easily transferred items and at large scale, fluxes to manage remain substantial.</p>
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            <abstract xml:lang="fr">
              <p>Les milieux urbains et les activités qui s’y déroulent peuvent constituer une source majeure de macrodéchets, y compris de macroplastiques, potentiellement transférés par les eaux de ruissellement urbain vers le milieu récepteur. Pourtant, peu d’études ont quantifié et caractérisé les flux de macrodéchets issus des zones urbaines et peu d’informations existent sur les facteurs qui régissent ces flux. Cette étude cherche donc à quantifier les flux de déchets véhiculés par les eaux pluviales à l’exutoire de deux bassins versants urbains de l’agglomération nantaise et à évaluer les paramètres qui régulent ces flux. Dans ce but, un suivi des macrodéchets accumulés à l’exutoire de ces bassins versants a été réalisé durant un an. Les déchets récupérés ont été pesés, caractérisés, certains ont été tracés, et ces flux ont été comparés aux densités de déchets quantifiées sur les surfaces urbaines pour évaluer un taux de transfert dans les eaux pluviales. Une variabilité importante des flux exportés jusqu’à l’exutoire démontre un transfert des macrodéchets non linéaire qui dépend de nombreux facteurs (facteurs hydrométéorologiques, typologie des déchets, aménagements urbains). Le taux de fuite des macrodéchets par rapport aux densités présentes sur les surfaces urbaines est faible mais les plastiques sont les déchets les plus facilement transférés et à grande échelle, les flux à gérer restent conséquents.</p>
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