title: Long-term stormwater quantity and quality analysis using continuous measurements in a French urban catchment.
abstract: The assessment of urban stormwater quantity and quality is important for evaluating and controlling the impact of the stormwater to natural water and environment. This study mainly addresses long-term evolution of stormwater quantity and quality in a French urban catchment using continuous measured data from 2004 to 2011. Storm event-based data series are obtained (716 rainfall events and 521 runoff events are available) from measured continuous time series. The Mann-Kendall test is applied to these event-based data series for trend detection. A lack of trend is found in rainfall and an increasing trend in runoff is detected. As a result, an increasing trend is present in the runoff coefficient, likely due to growing imperviousness of the catchment caused by urbanization. The event mean concentration of the total suspended solid (TSS) in stormwater does not present a trend, whereas the event load of TSS has an increasing tendency, which is attributed to the increasing event runoff volume. Uncertainty analysis suggests that the major uncertainty in trend detection results lies in uncertainty due to available data. A lack of events due to missing data leads to dramatically increased uncertainty in trend detection results. In contrast, measurement uncertainty in time series data plays a trivial role. The intra-event distribution of TSS is studied based on both M(V) curves and pollutant concentrations of absolute runoff volumes. The trend detection test reveals no significant change in intra-event distributions of TSS in the studied catchment.
authors.affiliation: University of Lyon, INSA Lyon, LGCIE-DEEP, F-69621 Villeurbanne Cedex, France. Electronic address: siao.sun@insa-lyon.fr.
authors.forename: Siao
authors.initials: S
authors.lastname: Sun
authors.affiliation: University of Lyon, INSA Lyon, LGCIE-DEEP, F-69621 Villeurbanne Cedex, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Barraud
authors.affiliation: University of Lyon, INSA Lyon, LGCIE-DEEP, F-69621 Villeurbanne Cedex, France.
authors.forename: Hélène
authors.initials: H
authors.lastname: Castebrunet
authors.affiliation: University of Lyon, INSA Lyon, LGCIE-DEEP, F-69621 Villeurbanne Cedex, France.
authors.forename: Jean-Baptiste
authors.initials: JB
authors.lastname: Aubin
authors.affiliation: University of Lyon, Université Lyon 1, LEHNA, F-69622 Villeurbanne Cedex, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Marmonier
mesh_terms: D004784:Environmental Monitoring; D005602:France; D011891:Rain / Q000737:chemistry*; D012621:Seasons; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality
chemical_list: D014874:Water Pollutants, Chemical
keywords: Continuous measurement; TSS; Trend analysis; Uncertainty analysis; Urban stormwater