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A sensitivity analysis of adsorption and degradation parameters in the modeling of pesticide transport in soils.

Villeneuve, Jean-Pierre, Lafrance, Pierre, Banton, Oliver, Frechette, Pierre et Robert, Claude (1988). A sensitivity analysis of adsorption and degradation parameters in the modeling of pesticide transport in soils. Journal of Contaminant Hydrology , vol. 3 , nº 1. p. 77-96. DOI: 10.1016/0169-7722(88)90018-6.

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Résumé

The increasing use of deterministic models in predicting the movement of pesticides in soils, has focused attention on the evaluation of major parameters which represent attenuation factors of organics in the subsurface. These parameters are the degradation rate constant and the adsorption constant for the pesticide. In view of the large in situ variability of these parameters and of the difficulty in obtaining accurate field data, there is a high degree of uncertainty associated with the results obtained from deterministic models. A sensitivity analysis is performed here to quantify the impact of such variation in each of these input parameters on the output results of an unsaturated zone transport model (PRZM). Results show that variations in these parameters about their respective mean values greatly affect the predicted concentration distributions, obtained after three years, of the pesticide aldicarb in all the soil profile. A 15–22% variation in the degradation constant, or a 24% variation in the adsorption constant, lead to a 100% uncertainty in the various simulation results defined as the cumulative quantity of aldicarb or the dissolved aldicarb concentration leached below the root zone (or the unsaturated zone) of the soil. Such a deterministic model presents a high degree of sensitivity to these input parameters. Accurate field data are then needed to obtain reliable model results in predicting pesticide movement inthe unsaturated zone.

Type de document: Article
Mots-clés libres: pesticide transport
Centre: Centre Eau Terre Environnement
Date de dépôt: 17 févr. 2021 16:41
Dernière modification: 17 févr. 2021 16:41
URI: https://espace.inrs.ca/id/eprint/11277

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