Skip to Main content Skip to Navigation
Theses

Contribution des retombées atmosphériques aux flux de polluants issus d'un petit bassin versant urbain: Cas du Pin Sec à Nantes

Abstract : Aerosol are the main carriers of pollutants in the atmosphere and have largely been studied because they have multiple effects on human health and the environment. Those aerosols and associated pollutants will be evacuated from the atmospheric compartment either by atmospheric deposition or by chemical transformation. After deposition, those pollutants can contribute to water pollution by leaching processes on surfaces. In urban areas, storm water pollution and the impact on aquatic system are of major concern and have been studied for several decades. The aim of this thesis is to improve the estimation of the contribution of atmospheric deposition to the global pollution of a small urban catchment in Nantes city (Pin Sec). To achieve this objective a new method has been used. It takes account of the different urban surfaces (i.e. tiles, bitumen, front coatings etc.) and relies on the use of a natural aerosol tracer, Beryllium 7. Micro pollutants (i.e. metals, pesticides and PAHs) have been characterized during a one-year survey. The survey shows that the pollution level on this catchment is low and that utilization of pesticides has been reduced. Furthermore, the study highlights the importance of the nature of urban surfaces on dry deposition flux. This flux appears to be lower than the flux estimated by classical methods. The metallic contribution is, therefore, less important than that previously reported (Zn : 30%, Cu : 52%, Pb :73% en annual mean).
keyword : BASSIN VERSANT
Document type :
Theses
Complete list of metadatas

Cited literature [200 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00851955
Contributor : Ifsttar Cadic <>
Submitted on : Monday, August 19, 2013 - 12:50:58 PM
Last modification on : Tuesday, December 8, 2020 - 10:20:18 AM
Long-term archiving on: : Wednesday, April 5, 2017 - 9:52:21 PM

File

doc00013926.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-00851955, version 1

Collections

Citation

Stéphane Percot. Contribution des retombées atmosphériques aux flux de polluants issus d'un petit bassin versant urbain: Cas du Pin Sec à Nantes. Autre. Ecole Centrale de Nantes (ECN), 2012. Français. ⟨tel-00851955⟩

Share

Metrics

Record views

725

Files downloads

4116