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2019 | OriginalPaper | Chapter

Characterization of the Dynamics of Microbiological and Chemical Contaminants in an Urban Catchment in South of France: From Field Data Collection to Modelling

Authors : Marlène Rio, Marie-George Tournoud, Christian Salles, Chrystelle Bancon-Montigny, Patrick Monfort, Claire Rodier, Mylène Toubiana, Pierre Marchand

Published in: New Trends in Urban Drainage Modelling

Publisher: Springer International Publishing

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Abstract

Densely urbanized areas generate a wide range of contaminants exerting pressures on the quality of downstream rivers. As urban areas are in permanent extension, assessing the potential evolution of water quality and the effects of mitigation measures is a real challenge. Modelling tools could be helpful in decision making but require sound field data for calibration steps. The present study focuses on the urban river Lez that crosses the area of Montpellier city. Due to the Mediterranean climate, extreme precipitations intensify the transfer of contaminants by generating land runoff and significant sewer overflow. The spatiotemporal variability in microbiological and chemical contamination of the Lez river and its tributaries is characterized through field campaigns. Three low flow campaigns and a flood event are presented here, with a focus on the most urbanized sub-catchment: Verdanson. Hydrological conditions are shown to have a strong impact on the water quality in terms of concentrations of fecal indicator bacteria, organotins, trace metals and polycyclic aromatic hydrocarbons. As a first step towards the modelling of the water quality during a flood event, a sensitivity analysis was performed to test how land cover could be properly be taken into account in the modelling process. The analysis reveals that discretizing the catchment into land cover-homogeneous subcatchments enhances the suitability of water quality model outputs, keeping good outputs of the hydrological model. Consequently, a rigorous description of land cover is required to properly assess the impacts of territorial dynamics on water quality.

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Literature
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Metadata
Title
Characterization of the Dynamics of Microbiological and Chemical Contaminants in an Urban Catchment in South of France: From Field Data Collection to Modelling
Authors
Marlène Rio
Marie-George Tournoud
Christian Salles
Chrystelle Bancon-Montigny
Patrick Monfort
Claire Rodier
Mylène Toubiana
Pierre Marchand
Copyright Year
2019
DOI
https://doi.org/10.1007/978-3-319-99867-1_118