Field leaching of pesticides at five test sites in Hawaii: modeling flow and transport
Jazyk angličtina Země Velká Británie, Anglie Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
21681917
DOI
10.1002/ps.2217
Knihovny.cz E-zdroje
- MeSH
- chemické látky znečišťující vodu analýza chemie MeSH
- chemické modely MeSH
- látky znečišťující půdu analýza chemie MeSH
- monitorování životního prostředí metody MeSH
- pesticidy analýza chemie MeSH
- počítačová simulace MeSH
- pohyb vody MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Havajské ostrovy MeSH
- Názvy látek
- chemické látky znečišťující vodu MeSH
- látky znečišťující půdu MeSH
- pesticidy MeSH
BACKGROUND: Physically based tier-II models may serve as possible alternatives to expensive field and laboratory leaching experiments required for pesticide approval and registration. The objective of this study was to predict pesticide fate and transport at five different sites in Hawaii using data from an earlier field leaching experiment and a one-dimensional tier-II model. As the predicted concentration profiles of pesticides did not provide close agreement with data, inverse modeling was used to obtain adequate reactive transport parameters. The estimated transport parameters of pesticides were also utilized in a tier-I model, which is currently used by the state authorities to evaluate the relative leaching potential. RESULTS: Water flow in soil profiles was simulated by the tier-II model with acceptable accuracy at all experimental sites. The observed concentration profiles and center of mass depths predicted by the tier-II simulations based on optimized transport parameters provided better agreements than did the non-optimized parameters. With optimized parameters, the tier-I model also delivered results consistent with observed pesticide center of mass depths. CONCLUSION: Tier-II numerical modeling helped to identify relevant transport processes in field leaching of pesticides. The process-based modeling of water flow and pesticide transport, coupled with the inverse procedure, can contribute significantly to the evaluation of chemical leaching in Hawaii soils.
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