PESTAN, Pesticide Transport, is a U.S. EPA program for evaluating the transport of organic solutes through the vadose zone to ground water.

PESTAN uses an analytical solution to calculate organic movement based on a linear isotherm, first-order degradation and hydrodynamic dispersion. Input data includes water solubility, infiltration rate, bulk density, sorption constant, degradation rates, saturated water content, characteristic curve coefficient, saturated hydraulic conductivity and dispersion coefficient. PESTAN includes the source code, executable version, user's manual, and technical support. The PESTAN Report/Doc is not included.

The PESTAN model is a computer code for estimating the transport of organic solutes through soil to groundwater. The model is based on a closed-form analytical solution of the advective-dispersive-reactive transport equation. The model has been tested under field and laboratory conditions.

PESTAN utilizes extended memory and is menu driven.

The slug begins to enter the soil at the first precipitation event at a rate equal to the pore water velocity. PESTAN assumes steady flow conditions through the soil domain. Only the slug enters the soil, the pollutant transport is influenced by sorption and dispersion. Mass of the pollutant can be lost via liquid-phase decay or via migration out of the soil domain.

- The leachate concentration equals the maximum possible concentration, i.e. solubility.
- The slug enters the soil at the velocity of the pore water, which is the ratio of the recharge rate to the pore water content.
- Steady-state flow conditions are assumed.
- Homogeneous soil conditions are assumed.
- Linear isotherms describe the partitioning of the pollutant between the liquid and soil phases.
- First order degradation of the pollutant is assumed.
- The water content of the soil is related to the hydraulic conductivity by a simple relationship.
- The model does not account for non-aqueous phase liquids or any flow conditions derived from variable density.

- 1. Water Solubility (S) in mg/l
- 2. Recharge (infiltration rate)
- 3. Sorption Constant (Kd)
- 4. Solid-phase degradation rate constant (ks)
- 5. Liquid-phase degradation constant (kl)
- 6. Bulk Density (rb)
- 7. Saturated Water Content (Qsat)
- 8. Characteristic Curve Coefficient (b)
- 9. Saturated Hydraulic Coefficient (Ksat)
- 10. Dispersion Coefficient (D)
- 11. Minimum x-value (upper depth)
- 12. Maximum x-value (lower depth)
- 13. Minimum time value ( initial time - days)
- 14. Maximum time value (time when simulation ends - days)
- 15. Number of time periods for printing out results
- 16. Time values (time values at which output will be documented)
- 17. Number of applications of waste (number of applications prior to recharge)
- 18. Waste application rate and starting time (mass of pollutant applied per unit area)

Κατάλογος επιστημονικών προγραμμάτων της MP & Associates που είτε δεν υπάρχει αντιπρόσωπος στην Ελλάδα και έτσι τα εισάγουμε είτε υπάρχει και μπορούμε να σας τα προμηθεύσουμε μέσω αυτού.

Προηγούμενη σελίδα