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    Dilution of pesticides in groundwater during advective dispersive transport

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    Authors
    Uffink GJM
    Linden AMA van der
    Type
    Report
    Language
    en
    
    Metadata
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    Title
    Dilution of pesticides in groundwater during advective dispersive transport
    Translated Title
    Verdunning van bestrijdingsmiddelen in het grondwater gedurende advectief-dispersief transport
    Publiekssamenvatting
    De gevolgen van dispersie op de pesticideconcentratie in het verzadigde grondwater is onderzocht aan de hand van scenario computer simulaties voor een gebied in Nederland (Lochem). De simulaties tonen aan dat de concentratie afneemt met de diepte, maar de mate waarin dit gebeurt is niet systematisch en varieert over het gebied. Aan de randen, waar maisland en grasland aan elkaar grenzen is de reductie aanzienlijk. In andere delen, vooral bij lange belastingsperioden (d.w.z. > 10 jaar), is de reductie beperkt en naderen de concentraties geleidelijk de ingangsconcentraties. De verlaging van de concentratie door dispersie is gebaseerd op menging van het verontreinigde grondwater met grondwater uit de omringende gebieden. Dat betekent dat de reductie klein zal zijn als er sprake is van diffuse verontreiniging of wanneer de belasting lange tijd op een bepaald niveau blijft. Het belangrijkste effect van dispersie is het afvlakken van pieken. De uiteindelijke verdunning hangt daarom in hoge mate af van hetgeen er in de omgeving gebeurt. Het optreden van dispersie is op zich geen garantie dat concentraties op 10 meter diepte worden gereduceerd tot beneden de drempelwaarde als ze in het bovenste grondwater net boven die waarde liggen.
    The impact of dispersion on the concentration of pesticide in the saturated groundwater was studied using scenario-type computer simulations for an area in the eastern part of the Netherlands (Lochem). The simulations demonstrated concentrations to decrease with depth; however, the rate of reduction is not systematic and varies throughout the area. On the boundaries between maize-land and grassland the reduction is considerable. In other parts of the area the reduction is limited and the concentrations gradually approach input concentrations, especially for long-term applications (i.e. > 10 years). The decrease in concentration by dispersion is based on the mixing of contaminated water with water from the surrounding areas. Therefore, the reduction for diffuse contamination or in cases where the load is maintained at a certain level for a long period of time, will be low. The most important effect of dispersion is the leveling out of peaks. The final rate of dilution depends highly on the situation in the surrounding area. Occurrence of dispersion itself is no guarantee that concentrations at a depth of 10 m will be reduced to below the threshold level, when they are above the threshold level in the uppermost groundwater.
    Sponsors
    DGM/DWL
    URI
    http://hdl.handle.net/10029/258552
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