Title
Extension of the river water quality model no. 1 with the fate of pesticides Extension of the river water quality model no. 1 with the fate of pesticides
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
London : :IWA publishing, ,
Subject
Chemistry
Biology
Engineering sciences. Technology
Computer. Automation
Source (journal)
Journal of hydroinformatics. - London :
Volume/pages
14(2012) :1 , p. 48-64
ISSN
1464-7141
ISI
000298618300004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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.
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