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Extension of the River Water Quality Model no. 1 with the fate of pesticides

(2012) JOURNAL OF HYDROINFORMATICS. 14(1). p.48-64
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Abstract
The existing River Water Quality Model No. 1 (RWQM1) was extended with processes determining the fate of non-volatile pesticides in the water phase and sediments. The exchange of pesticides between the water column and the sediment is described by three transport processes: diffusion, sedimentation and resuspension. Burial of sediments is also included. The modified model was used to simulate the concentrations of diuron and chloridazon in the river Nil. A good agreement was found between the simulated pesticide concentrations and measured values resulting from a four-month intensive monitoring campaign. The simulation results indicate that pesticide concentrations in the bulk water are not sensitive to the selected biochemical model parameters. it seems that these concentrations are mainly determined by the imposed upstream concentrations, run-off and direct losses. The high concentrations in the bulk water were not observed in the sediment pore water due to a limited exchange between the water column and the sediment. According to a sensitivity analysis, the observed pesticide concentrations are highly sensitive to the diffusion and sorption coefficients. Therefore, model users should determine these parameters with accuracy in order to reduce the degree of uncertainty in their results.
Keywords
river water quality, sediment, pesticide fate, modelling, diuron, chloridazon, SORPTION, COHESIVE SEDIMENT, SEDIMENT TRANSPORT, HERBICIDES, SYSTEMS, CONTAMINANTS, DEGRADATION, MANAGEMENT, EROSION, SURFACE

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Citation

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Chicago
De Schepper, Veerle, Katrijn Holvoet, Lorenzo Benedetti, Piet Seuntjens, and Peter A Vanrolleghem. 2012. “Extension of the River Water Quality Model No. 1 with the Fate of Pesticides.” Journal of Hydroinformatics 14 (1): 48–64.
APA
De Schepper, V., Holvoet, K., Benedetti, L., Seuntjens, P., & Vanrolleghem, P. A. (2012). Extension of the River Water Quality Model no. 1 with the fate of pesticides. JOURNAL OF HYDROINFORMATICS, 14(1), 48–64.
Vancouver
1.
De Schepper V, Holvoet K, Benedetti L, Seuntjens P, Vanrolleghem PA. Extension of the River Water Quality Model no. 1 with the fate of pesticides. JOURNAL OF HYDROINFORMATICS. 2012;14(1):48–64.
MLA
De Schepper, Veerle, Katrijn Holvoet, Lorenzo Benedetti, et al. “Extension of the River Water Quality Model No. 1 with the Fate of Pesticides.” JOURNAL OF HYDROINFORMATICS 14.1 (2012): 48–64. Print.
@article{2135589,
  abstract     = {The existing River Water Quality Model No. 1 (RWQM1) was extended with processes determining the fate of non-volatile pesticides in the water phase and sediments. The exchange of pesticides between the water column and the sediment is described by three transport processes: diffusion, sedimentation and resuspension. Burial of sediments is also included. The modified model was used to simulate the concentrations of diuron and chloridazon in the river Nil. A good agreement was found between the simulated pesticide concentrations and measured values resulting from a four-month intensive monitoring campaign. The simulation results indicate that pesticide concentrations in the bulk water are not sensitive to the selected biochemical model parameters. it seems that these concentrations are mainly determined by the imposed upstream concentrations, run-off and direct losses. The high concentrations in the bulk water were not observed in the sediment pore water due to a limited exchange between the water column and the sediment. According to a sensitivity analysis, the observed pesticide concentrations are highly sensitive to the diffusion and sorption coefficients. Therefore, model users should determine these parameters with accuracy in order to reduce the degree of uncertainty in their results.},
  author       = {De Schepper, Veerle and Holvoet, Katrijn and Benedetti, Lorenzo and Seuntjens, Piet and Vanrolleghem, Peter A},
  issn         = {1464-7141},
  journal      = {JOURNAL OF HYDROINFORMATICS},
  keyword      = {river water quality,sediment,pesticide fate,modelling,diuron,chloridazon,SORPTION,COHESIVE SEDIMENT,SEDIMENT TRANSPORT,HERBICIDES,SYSTEMS,CONTAMINANTS,DEGRADATION,MANAGEMENT,EROSION,SURFACE},
  language     = {eng},
  number       = {1},
  pages        = {48--64},
  title        = {Extension of the River Water Quality Model no. 1 with the fate of pesticides},
  url          = {http://dx.doi.org/10.2166/hydro.2011.028},
  volume       = {14},
  year         = {2012},
}

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