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Effects of water extraction in a vulnerable phreatic aquifer: Consequences for groundwater contamination by pesticides, Sint-Jansteen area, The Netherlands

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Effects of water extraction in a vulnerable phreatic aquifer: Consequences for groundwater contamination by pesticides, Sint-Jansteen area, The Netherlands

Content Provider	Springer Nature Link
Author	Gaus, Irina
Copyright Year	2000
Abstract	Pesticides are a potential threat to the quality of extracted groundwater when the water-supply area is used for agricultural activities. This problem is discussed for the water-supply area of Sint-Jansteen, The Netherlands, where measured pesticide concentrations in the extracted water regularly exceed EU limits (0.1 μg/L). Groundwater samples taken from the aquifer within the water-supply area show low contamination, but samples taken from the extracted water occasionally contain pesticides, making the water inadequate for drinking-water purposes. The more intense contamination of the extracted water is caused by the change in the natural groundwater flow pattern near the extraction wells. In this area, pesticide use cannot be avoided easily, and an approach is given to differentiate pesticide use in the area according to expected travel time toward the wells and the chemical characteristics of the pesticides. A groundwater flow model for the area is developed and the effects of groundwater extraction on the natural flow pattern are evaluated. Using particle tracking, the travel-time zones are determined. Combining these results and the degradation behavior of certain pesticides led to an optimal scheme to integrate agricultural activities and groundwater extraction in the area. This is illustrated for five different types of pesticides (atrazine, simazine, bentazone, MCPA, and mecoprop). Les pesticides sont une menace potentielle pour la qualité de l'eau souterraine prélevée lorsque la zone de captage est soumise à des activités agricoles. Ce problème est discuté dans le cas de la zone de captage de Sint-Jansteen (Pays-Bas), où les concentrations mesurées en pesticides dans les eaux pompées dépassent régulièrement les normes européennes (0,1 μg/L). Les échantillons d'eau souterraine prélevés dans l'aquifère dans la zone de captage montrent une faible contamination, mais les échantillons d'eau pompée contiennent occasionnellement des pesticides, ce qui rend l'eau impropre à la consommation. La contamination plus importante de l'eau pompée est provoquée par la modification des directions d'écoulement souterrain naturel au voisinage des puits de pompage. Dans cette région, l'usage des pesticides ne peut pas être évité facilement; c'est pourquoi une approche est développée pour différencier les usages de pesticides dans ce secteur en fonction des temps de parcours prévus en direction des puits et des caractéristiques chimiques des pesticides. Un modèle d'écoulement des eaux souterraines pour cette région a été développé et les effets des pompages sur les directions d'écoulement naturel ont étéévalués. Les zones de temps de parcours ont été déterminées au moyen de la méthode du suivi de particules (particle tracking). La combinaison de ces résultats avec le comportement de certains pesticides au cours de leur dégradation conduit à un schéma optimisé conciliant les activités agricoles et les prélèvements d'eaux souterraines dans cette région. Cette question est abordée pour cinq types de pesticides (atrazine, simazine, bentazone, MCPA et mecoprop). Los pesticidas son una amenaza para la calidad de las aguas subterráneas cuando el área de suministro se encuentra en una zona agrícola. Un ejemplo tiene lugar en la zona de Sint-Jansteen, Holanda, donde mientras que las muestras de agua subterránea tomadas directamente del acuífero tienen un bajo nivel de contaminación por pesticidas, las muestras tomadas del agua extraída exceden con regularidad los límites de la UE (0.1 μg/l), lo que hace que el agua sea no potable. Esta diferencia está causada por las variaciones respecto al régimen de flujo natural a consecuencia de las propias extracciones. En esta zona el uso de pesticidas es difícilmente evitable, por lo que se está desarrollando un método para diferenciar la posibilidad de uso de pesticidas en función de las características químicas de los pesticidas y de su tiempo de tránsito esperado hasta los pozos de abastecimiento. Se está desarrollando un modelo matemático para evaluar los efectos de las extracciones sobre el flujo subterráneo natural. Usando el método de seguimiento de partículas se calculan los tiempos de tránsito, y combinando estos resultados con la biodegradación potencial de los pesticidas se diseña un esquema óptimo para la integración de actividades agrícolas y de uso de boca en el área. Esta metodología se muestra para distintos tipos de pesticidas.
Starting Page	218
Ending Page	229
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	8
Issue Number	2
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-05-04
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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Effects of water extraction in a vulnerable phreatic aquifer: Consequences for groundwater contamination by pesticides, Sint-Jansteen area, The Netherlands