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A modeling study of heterogeneity and surface water-groundwater interactions in the Thomas Brook catchment, Annapolis Valley (Nova Scotia, Canada).

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Gauthier, Marie-Josée; Camporese, Matteo; Rivard, Christine; Paniconi, Claudio; Larocque, Marie (2009). A modeling study of heterogeneity and surface water-groundwater interactions in the Thomas Brook catchment, Annapolis Valley (Nova Scotia, Canada). Hydrology and Earth System Sciences , vol. 13 , nº 9. p. 1583-1596. DOI: 10.5194/hess-13-1583-2009.

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Résumé

A 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.

Type de document: Article
Mots-clés libres: basalt;catchment;database; groundwater-surface water interaction; hydraulic conductivity; hydrological modeling; hydrological response; numerical model; snow accumulation; snowmelt; spatiotemporal analysis; streamflow
Centre: Centre Eau Terre Environnement
Date de dépôt: 29 nov. 2019 14:48
Dernière modification: 29 nov. 2019 14:48
URI: http://espace.inrs.ca/id/eprint/9433

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