کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5751354 1619712 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multicontamination phenomena occur more often than expected in Mediterranean coastal watercourses: Study case of the Têt River (France)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Multicontamination phenomena occur more often than expected in Mediterranean coastal watercourses: Study case of the Têt River (France)
چکیده انگلیسی


- Pollutants cocktails dynamics was studied at river waters during storms and floods.
- Exceptional multicontamination phenomena occur during CSO at heavy rainfall peaks.
- Diffuse pollution sources will be most important at flood flow peaks.
- We can consider these as Mediterranean chronic multiple stressors events.
- Management measures include tackling CSO and monitoring during storm events.

Contaminants found in watercourses are not only the result of anthropogenic activities but also depend on river's seasonal hydrodynamics. This is particularly true in Mediterranean climate regions where long dry periods are interrupted by strong rainfalls. Storm events remobilize particles from soils and sediments and, as a consequence, the load of particulate matter in rivers can be quite considerable, severely affecting water quality. Nevertheless, an absence of fieldwork studies exists concerning the simultaneous dynamics of mixtures of pollutants in river waters, particularly during strong rainfalls and floods. Our study assessed the concentrations of six families of pollutants, including pesticides, at these events, and compared them to those observed at drought sampling periods. We have used as model a typical Mediterranean coastal river from Southeast France, the Têt River, whose hydrodynamics and major elements fluxes have been fairly investigated. As expected, our results show that chemical mixtures due to human activities occur and that they are particularly relevant during storm events. But the results of our study argue that exceptional multicontamination phenomena actually happen more often than expected because they are linked to recurrent sudden intense rainfall events in the Mediterranean. In particular, combined sewer overflows are responsible for this major issue in urbanized areas, whereas runoff and leaching will be the most important sources of pollutant mixtures occurring at flood flow peak. After an overview of the sources responsible for chronic multiple stressors events in regions under a Mediterranean climate regime worldwide, we revisit best management measures to reduce risks from the presence of chemical mixtures in the environment.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 579, 1 February 2017, Pages 10-21
نویسندگان
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