GEOSCAN, résultats de la recherche


TitreComparative Study of Methods for WHPA Delineation
AuteurParadis, D; Martel, R; Karanta, G; Lefebvre, R; Michaud, Y; Therrien, R; Nastev, M
SourceGround Water vol. 45, no. 2, 2007 p. 158-167,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20060200
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC21L/12; 31G/09
Lat/Long OENS-74.5000 -74.0000 45.7500 45.5000
Lat/Long OENS-71.5000 -71.5000 46.7500 46.5000
Sujetseau souterraine; pollution de l'eau souterraine; ressources en eau souterraine; régimes des eaux souterraines; qualité de l'eau; écoulement de la nappe d'eau souterraine; aquifères; aquifères du substratum rocheux; puits d'eau; puits; unités hydrostratigraphiques; conductivité; hydrogéologie
Illustrationssketch maps; graphs; tables; plots; cross-sections
Résumé(disponible en anglais seulement)
Human activities, whether agricultural, industrial, commercial, or domestic, can contribute to ground water quality deterioration. In order to protect the ground water exploited by a production well, it is essential to develop a good knowledge of the flow system and to adequately delineate the area surrounding the well within which potential contamination sources should be managed. Many methods have been developed to delineate such a wellhead protection area (WHPA). The integration of more information on the geologic and hydrogeologic characteristics of the study area increases the precision of any given WHPA delineation method. From a practical point of view, the WHPA delineation methods allowing the simplest and least expensive integration of the available information should be favored. This paper presents a comparative study in which nine different WHPA delineation methods were applied to a well and a spring in an unconfined granular aquifer and to a well in a confined highly fractured rock aquifer. These methods range from simple approaches to complex computer models. Hydrogeological mapping and numerical modeling with MODFLOW-MODPATH were used as reference methods to respectively compare the delineation of the zone of contribution and the zone of travel obtained from the various WHPA methods. Although applied to simple ground water flow systems, these methods provided a relatively wide range of results. To allow a realistic delineation of the WHPA in aquifers of variable geometry, a WHPA delineation method should ensure a water balance and include observed or calculated regional flow characteristics.