Macropore flow in soils and pesticide risk assessment
The use of pesticides in agriculture may result in contamination of groundwater and surface waters. Pesticide risk assessment is applied to evaluate this risk and is commonly employed by mechanistic models. Water flow and pesticide transport in soils can be uniform or non-uniform (preferential flow)...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Chile |
| OAI Identifier: | oai:repositorio.anid.cl:10533/246438 |
| Acceso en línea: | https://hdl.handle.net/10533/246438 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Agrícolas Otras Ciencias Agrícolas |
| Sumario: | The use of pesticides in agriculture may result in contamination of groundwater and surface waters. Pesticide risk assessment is applied to evaluate this risk and is commonly employed by mechanistic models. Water flow and pesticide transport in soils can be uniform or non-uniform (preferential flow), and mechanistic models incorporate both processes. In this research, we studied only preferential flow due to macropores. Macropores variate in time and space for field conditions, the spatial variation is mentioned here as heterogeneous macropore geometries. Macropore flow is commonly simulated by dual-permeability models such as HYDRUS and SWAP. The representation of heterogeneous macropore geometries in both models is challenging and the primary goal of this research. Understanding the parametrization of HYDRUS and SWAP under heterogeneous macropore geometries would help to ensure water availability for current and future inhabitants of this planet. |
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