Monitoring and modeling pesticide dynamics in surface water at the catchment-scale: a review
Holvoet, K.; Seuntjens, P.; Van Griensven, A.; Vanrolleghem, P.A. [s.d.]. Monitoring and modeling pesticide dynamics in surface water at the catchment-scale: a review, in: [s.d.] Proceedings of the 13th Symposium in Pesticide Chemistry, Piacenza, Italy, 3-6 September 2007. pp. accepted for publication
In: (S.d.). Proceedings of the 13th Symposium in Pesticide Chemistry, Piacenza, Italy, 3-6 September 2007. [S.n.]: [s.l.]. , more
Fast flow processes determine the occurrence and dynamics of pesticides in river systems at the catchment-scale. Fast flow and transport of pesticides to rivers can be attributed to macroporous flow in tile-drained fields and surface runoff in sloped areas, but also due to point sources such as urban drainage, effluents of waste water treatment plants, and bad agricultural practices. We reviewed the state-of-the-art in monitoring and modeling pesticide dynamics in surface water at the catchment scale. The review focused on fast flow processes in the field determining the pattern and amplitude of pesticide concentrations in the rivers. We demonstrate the dynamics of pesticides in two Belgian river catchments of varying size. We continuously monitored eight pesticides (atrazine, carbendazim, chloridazon, diuron, isoproturon, lenacil and simazine) in surface water during spring application. The surface water showed hourly variations in pesticide concentrations. To identify the operative processes at the catchment scale, we used the SWAT model to predict river flow and pesticide dynamics at the catchment outlet. The observations and simulations clearly demonstrate the importance of point sources
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