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Colonisation végétale des basins d’infiltration et de rétention : caractérisation de la flore et évolution des caractéristiques physico-chimiques de l’horizon de surface végétalisé

Abstract : Urban stormwater basins surfaces can be highly contaminated and can be spontaneously or intentionaly vegetated. The aim of this work is to better characterize the role of the vegetation on heavy metal (Zn, Cd, Cu) mobility. Firstly, vegetation inventory has pointed out the high species diversity in these devices (from ruderal vegetation to wetland plants). Then, a physico-chemical characterization of surface samples vegetated by dominant species has been carried out. We have shown that carbonates and organic matter play a major role in the control of heavy metal mobility. The parameters which are the most spatially and temporally variable are essentially related to organic matter cycle (nitrate, heavy metal fraction bound to organic matter), and to the introduction of stormwater suspended matter (heavy metals, texture). At the maximum of plant growth phase, heavy metal mobility is enhanced and the period of plant death leads to a better heavy metal retention in the basin surface. This thesis invites us to consider plants as agents of surface stormwater basin transformation and to include plants in future research work.
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https://tel.archives-ouvertes.fr/tel-00715802
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Submitted on : Monday, July 9, 2012 - 12:01:26 PM
Last modification on : Wednesday, October 14, 2020 - 4:07:35 AM
Long-term archiving on: : Wednesday, October 10, 2012 - 2:35:17 AM

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  • HAL Id : tel-00715802, version 1

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Muriel Saulais. Colonisation végétale des basins d’infiltration et de rétention : caractérisation de la flore et évolution des caractéristiques physico-chimiques de l’horizon de surface végétalisé. Autre. INSA de Lyon, 2011. Français. ⟨NNT : 2011ISAL0116⟩. ⟨tel-00715802⟩

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