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TitreRegional recharge estimation using multiple methods: an application in the Annapolis Valley, Nova Scotia (Canada)
AuteurRivard, C; Lefebvre, R; Paradis, D
SourceEnvironmental Earth Sciences vol. 71, no. 3, 2013 p. 1389-1408, https://doi.org/10.1007/s12665-013-2545-2
Année2013
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100141
ÉditeurSpringer
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1007/s12665-013-2545-2
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNouvelle-Écosse
SNRC21H/02
Lat/Long OENS-65.0000 -64.5000 45.2500 45.0000
Sujetseau souterraine; résurgence des eaux souterraines; régimes des eaux souterraines; niveaux des eaux souterraines; débits d'alimentation en eau; ressources en eau souterraine; écoulement de la nappe d'eau souterraine; aquifères; hydrogéologie
Illustrationslocation maps; tables; cross-sections; plots
ProgrammeAquifer Assessment & support to mapping, Géoscience des eaux souterraines
Résumé(disponible en anglais seulement)
Recharge is a key parameter in groundwater resources management, and a reliable estimate of recharge is required for their sustainable development. Several methods are available to evaluate recharge; however, selecting the appropriate one is made difficult because each method has its advantages and drawbacks, and results can vary greatly from one method to another. Recharge methods can actually refer to different processes. This paper compares and discusses the results obtained from five regional-scale recharge assessment approaches applied to a fractured rock aquifer in a region with a temperate and humid climate (Annapolis Valley, Nova Scotia, Canada). These methods are distinguished between those providing estimates of the net infiltration (I) into the subsurface (river hydrograph separation and soil moisture balance) from those considering the net recharge (W) to the regional bedrock aquifer (river 7-day low-flows, the corrected soil moisture balance, a numerical groundwater flow model developed with FEFLOW and an infiltration model developed with HELP). The estimated net infiltration ranges from 160 to 250 mm/year, whereas the net recharge estimates range from 80 to 175 mm/year for the entire study area. Although different assessment methods were used, the estimated recharge range is still quite large, demonstrating the importance of using several methods. This case study should provide guidance on choices to be made in the development of a strategy for assessing representative values of aquifer recharge at the regional scale under similar geological and climatic conditions. The use of multiple complementary approaches should lead to a better understanding of the system dynamics and to better defined a representative range of recharge estimates.
GEOSCAN ID286159