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TitleA modeling study of heterogeneity and surface water-groundwater interactions in the Thomas Brook catchment, Annapolis Valley (Nova Scotia, Canada)
AuthorGauthier, M J; Camporese, M; Rivard, CORCID logo; Paniconi, C; Larocque, M
SourceHydrology and Earth System Sciences vol. 13, no. 9, 2009 p. 1583-1596, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20080707
PublisherCopernicus GmbH
Mediapaper; on-line; digital
File formatpdf
ProvinceNova Scotia
AreaThomas Brook; Annapolis Valley
Lat/Long WENS -64.7500 -64.7000 45.1167 45.0333
Subjectshydrogeology; surficial geology/geomorphology; models; modelling; groundwater; groundwater resources; groundwater regimes; groundwater flow; groundwater circulation; hydrologic environment; hydrologic budget; glacial deposits; marine deposits; Cenozoic; Quaternary
Illustrationslocation maps; graphs; tables; cross-sections; plots
ProgramGroundwater Mapping Program
Released2009 09 08
AbstractA modelling study of the impacts of subsurface heterogeneity on the hydrologic response of a small catchment is reported. The study is focused in particular on the hydraulic connection and interactions between surface water and groundwater. A coupled (1-D surface/3-D subsurface) numerical model is used to investigate, for a range of scenarios, the spatio-temporal patterns of response variables such as return flow, recharge, groundwater levels, surface saturation, and streamflow. Eight scenarios of increasing geological complexity are simulated for an 8 km2 catchment in the Annapolis Valley (eastern Canada), introducing at each step more realistic representations of the geological strata and corresponding hydraulic properties. In a ninth scenario the effects of snow accumulation and snowmelt are also considered. The results show that response variables and significant features of the catchment (e.g. springs) can be adequately reproduced using a representation of the geology and model parameter values that are based on targeted fieldwork and existing databases, and that reflect to a sufficient degree the geological and hydrological complexity of the study area. The hydraulic conductivity values of the thin surficial sediment cover (especially till) and of the basalts in the upstream reaches emerge as key elements of the basin's heterogeneity for properly capturing the overall catchment response.

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