Hysteresis and parent-metabolite analyses unravel characteristic pesticide transport mechanisms in a mixed land use catchment
| Autor: | Jan Bronders, Piet Seuntjens, Christian Stamm, Ann van Griensven, Ting Tang |
|---|---|
| Přispěvatelé: | Hydrology and Hydraulic Engineering, Faculty of Engineering |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Biocide 0208 environmental biotechnology runoff 02 engineering and technology 010501 environmental sciences 01 natural sciences Transport Pathway Rivers Retention basin Transport pathway Environmental monitoring Pesticides Biology Waste Management and Disposal 0105 earth and related environmental sciences Civil and Structural Engineering Urban runoff WWTP Water Science and Technology Hydrology Ecological Modeling Agriculture Urbanised catchment Pesticide Urban pollutant Pollution 020801 environmental engineering Catchment hydrology Chemistry Ecological Modelling Environmental science Combined sewer Surface runoff Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Water research |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2017.08.016 |
| Popis: | To properly estimate and manage pesticide occurrence in urban rivers, it is essential, but often highly challenging, to identify the key pesticide transport pathways in association to the main sources. This study examined the concentration-discharge hysteresis behaviour (hysteresis analysis) for three pesticides and the parent-metabolite concentration dynamics for two metabolites at sites with different levels of urban influence in a mixed land use catchment (25 km(2)) within the Swiss Greifensee area, aiming to identify the dominant pesticide transport pathways. Combining an adapted hysteresis classification framework with prior knowledge of the field conditions and pesticide usage, we demonstrated the possibility of using hysteresis analysis to qualitatively infer the dominant pesticide transport pathway in mixed land-use catchments. The analysis showed that hysteresis types, and therefore the dominant transport pathway, vary among pesticides, sites and rainfall events. Hysteresis loops mostly correspond to dominant transport by flow components with intermediate response time, although pesticide sources indicate that fast transport pathways are responsible in most cases (e.g. urban runoff and combined sewer overflows). The discrepancy suggests the fast transport pathways can be slowed down due to catchment storages, such as topographic depressions in agricultural areas, a wastewater treatment plant (WWTP) and other artificial storage units (e.g. retention basins) in urban areas. Moreover, the WWTP was identified as an important factor modifying the parent-metabolite concentration dynamics during rainfall events. To properly predict and manage pesticide occurrence in catchments of mixed land uses, the hydrological delaying effect and chemical processes within the artificial structures need to be accounted for, in addition to the catchment hydrology and the diversity of pesticide sources. This study demonstrates that in catchments with diverse pesticide sources and complex transport mechanisms, the adapted hysteresis analysis can help to improve our understanding on pesticide transport behaviours and provide a basis for effective management strategies.(C) 2017 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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