Transport of sediment borne contaminants in a Mediterranean river during a high flow event
Fecha de publicación2018
MetadatosMostrar el registro completo del ítem
Pollutants' dynamics in rivers flowing through industrial areas is linked to the entrainment and transport of contaminants attached to solid particles. The transport of sediment is mainly associated to high discharges and flood episodes, and these events constitute one of the main factors causing fluxes
of buried pollutants in rivers. We performed a field study in the lower River Cinca (Ebro basin, Northeast Spain) to quantify the mobilization and transfer of several contaminants present in the river bed sediments. We focused on contaminants previously identified (PCBs, DDXs, PBDEs, HBCDs and PFRs) to occur in the river. River bed sediment samples were collected during low flows and a subsequent sampling campaign was used to capture sediment borne contaminants during a flood event. Water samples were taken at the same locations as the static sediment samples and used to determine the suspended sediment concentrations and the contaminants content (i.e. mass of contaminant per sediment mass unit) during the event. We estimated mass fluxes for both sediment and pollutants, and determined that sediment transport followed a clockwise hysteresis. This is typically observed in high flow events after dry summer periods. With sediments there was a large mobilization of PFRs (36 kg in 48 h in one of the main tributaries) and PCBs not previously observed in the static sediment. Observed contaminant load ranges during the two-day sampling campaign were: PCB (34–152 g), DDT (12–213 g), PBDE (50–1740 g), HBCD (0–2.2 g) and PFR (2410–35,895 g). An environmental risk assessment was carried out by comparing the pollutant concentrations found in the sediments with the Canadian quality guidelines (ISQC), showing a significant noncompliance for PCBs in dynamic sediments. Our results point out to the need of a regular assessment of the downstream transfer of the sediment-borne pollutants in drainage basins historically affected by intense industrial activities and associated contamination.
Es parte deScience of the Total Environment, 2018, vol. 633, p. 1392-1402
El ítem tiene asociados los siguientes ficheros de licencia:
Showing items related by title, author, creator and subject.
Buendia, C.; Herrero, A.; Sabater, Sergi; Batalla, Ramon J. (Elsevier, 2016)The number of studies assessing soil erosion and sediment transport has increased with the aim of achieving sustainable land and water management. Mediterranean rivers have been the object of many of these studies due to ...
Dynamics of suspended sediment borne persistent organic pollutants in a large regulated Mediterranean river (Ebro, NE Spain) Quesada, S.; Tena Tarruella, Anna; Guillén, D.; Ginebreda, A.; Vericat Querol, Damià; Martínez, E.; Navarro Ortega, A.; Batalla, Ramon J.; Barceló, Damià (Elsevier, 2013)Mediterranean rivers are characterized by highly variable hydrological regimes that are strongly dependent on the seasonal rainfall. Sediment transport is closely related to the occurrence of flash-floods capable to deliver ...
Water research in the Mediterranean: challenges and perspectives. The Catalan Institute for Water Research (ICRA) Sabater, Sergi; Acuña, Vicenç; Batalla, Ramon J.; Balcázar, José Luis; Borrego, Carles; Insa, Sara; Marcé, Rafael; Mas Pla, Josep; Petrovic, Mira; Pijuan, Maite; Rodriguez Mozaz, Sara; Rodríguez Roda, Ignasi; Villagrasa, Marta; Barceló, Damià (Institut d'Estudis Catalans, 2014)The mission of the Catalan Institute for Water Research (ICRA) is to implement a holistic, multidisciplinary approach to water research, taking into account all components related to freshwaters and human-used waters. The ...