Experimental and numerical study on the leaching of pesticides into the groundwater through a porous medium: Effects of transport parameters
| Autor: | Djamel Haddad, Abdelhak Gheid, Khoula Haddad, Kafia Oulmi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Convection
Mass transfer coefficient Materials science Diffusion 0208 environmental biotechnology Finite difference method Soil Science 04 agricultural and veterinary sciences 02 engineering and technology Plant Science Péclet number Mechanics 020801 environmental engineering symbols.namesake Vadose zone 040103 agronomy & agriculture symbols 0401 agriculture forestry and fisheries Convection–diffusion equation Porous medium General Environmental Science |
| Zdroj: | Environmental Technology & Innovation. 13:244-256 |
| ISSN: | 2352-1864 |
| Popis: | This study aims to investigate, experimentally and numerically, the pesticide transport through the soil in unsaturated zone. The movement of pesticide is described with one dimensional model. The transport equation incorporates terms accounting for diffusion –convection, adsorption and reaction. The first objective of this work was to identifies the effects of the parameters transport such us; the dimensions first order degradation coefficient ( μ ), the peclet number ( ρ e ) and the dimensionless mass transfer coefficient (w). The evolution of pesticide concentration in function of depth and time was found by using the non-equilibrium transport model. The data obtained show the importance of the adsorbed concentration. The second objective is to find the relation between the concentration and the transport parameters because there is a difficulty of the analytical solution. The solution of the problem was carried out by a numerical approach by using the finite difference method and a Fortran program. |
| Databáze: | OpenAIRE |
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