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- W633509964 abstract "Recent documentation of agrochemical contamination of groundwater has suggested that agricultural practices need to be modified in order to reduce contaminant leaching from the root zone. Developing agricultural practices which maintain groundwater quality requires quantitative sampling approaches that allow determination of contaminant transport rates for specific practices. Increasingly widespread evidence of the transient and spatially variable nature of solute transport in the vadose zone suggests that sampling groundwater may provide the most reliable method for determining solute leaching rates, particularly where the water table is located close to the soil surface. Hydraulic gradients in the groundwater component of a vadose zone-unconfined aquifer flow system are generally lower and more stable than those in the unsaturated region, resulting in less transient flow conditions during recharge periods. As the thickness or water holding capacity of the vadose zone increases, the transport of solutes from the root zone to groundwater becomes less direct, requiring more solute data collection from the unsaturated region of the soil profile. Water and solute storage in the vadose zone immediately above the water table will alter leachate solute levels during recharge, to an extent determined by the water holding characteristics of the profile. Stratification of groundwater solute levels near the water table as a consequence of changes in root zone leaching rates requires discrete well screen placement based on water table fluctuation patterns if groundwater sampling is to be used to establish leaching rates for specific agricultural practices." @default.
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- W633509964 date "1991-06-20" @default.
- W633509964 modified "2023-09-27" @default.
- W633509964 title "Monitoring Agrochemical Transport into Shallow Unconfined Aquifers" @default.
- W633509964 doi "https://doi.org/10.1021/bk-1991-0465.ch016" @default.
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