The general objective of the present study was to contribute to a justified application of plot-scale developed models of
non-point source pollutants on a regional-scale. Two environmental issues were studied, i.e. the leaching of pesticides to
the shallow groundwater and the accumulation of cadmium in the topsoil and leaching into the groundwater. These two issues
were chosen because they required entirely different model approaches. Pesticide leaching was calculated with a detailed,
numerical, multi-layer model with a high temporal resolution (PESTRAS). Processes included were transient flow, convection,
hydrodynamic dispersion, equilibrium sorption, degradation, uptake by plant roots and volatilization. In the heavy metal accumulation
study two models were used: A comprehensive, multi-layer, numerical model (METRAS), which was applicable at the plotscale,
and a simple analytical, one-layer model with a lower temporal resolution (SOACAS), which was used for the regional-scale
assessments. Processes included in SOACAS are steady-state waterflow, convection, equilibrium sorption, complexation, and
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let
the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible
and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands.
You will be contacted as soon as possible.