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TitleReconstitution des apports en eau des deux derniers siècles : approche méthodologique. Application au réservoir Caniapiscau (Complexe La Grande, Québec)
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorNicault, A; Boucher, É; Guiot, J; Bégin, Y
SourceUtilisation des archives naturelles pour la reconstitution du passé hydro-climatique; by Bégin, C; Nicault, A; Bégin, Y; Geological Survey of Canada, Open File 8768, 2021 p. 152-161, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Utilisation des archives naturelles pour la reconstitution du passé hydro-climatique
File formatpdf
ProvinceQuebec; Newfoundland and Labrador
NTS13E; 13L; 13M; 23; 33A; 33B; 33G; 33H; 33I; 33J; 33O; 33P
AreaComplexe La Grande; Réservoir Caniapiscau; Lac Nitchequon
Lat/Long WENS -75.0000 -62.0000 56.0000 53.0000
Subjectsenvironmental geology; hydrogeology; geochemistry; Nature and Environment; Science and Technology; Economics and Industry; Recent; climatology; paleoclimatology; hydrologic environment; hydrologic budget; watersheds; dendrochronology; stable isotope studies; carbon isotopes; oxygen isotopes; paleoenvironment; statistical analyses; correlations; densities; energy resources; hydroelectric power; Le projet ARCHIVES; North Atlantic Oscillation; Arctic Oscillation; Picea mariana; Climate change; Hydrology; Boreal ecosystems; Forests; Biology; Trees; Water supply; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; flow diagrams; time series; plots
ProgramClimate Change Geoscience Extreme Events
Released2021 06 28
AbstractThe objective of this study was to reconstruct 200 years of spring (Qspr), summer (Qsum) and annual (Qann) water supply variability at the Caniapiscau Reservoir in the remote area of northern Quebec. This key area for hydropower production lacks long-term hydrological records, and tree-ring proxies are thought to be the best substitute for extending the instrumental climatic records. Tree-ring widths, ring densities and stable isotope ratios (delta-13C and delta-18O) were used to perform paleohydrological reconstructions. The following reconstruction techniques were evaluated for each variable reconstructed: partial least square (PLS) regression applied to all of the tree-ring series, PLS regression applied to selected tree-ring series, and the best analogue method (BAM) applied to selected tree-ring series. These three reconstructions were then combined into a composite reconstruction. Reconstruction verification shows that the annual and summer water supply reconstruction quality is good, while the verification tests disqualified our spring water supply reconstruction. The reconstructed long-term water supply variations over the past two centuries are dominated by decadal to sub-decadal fluctuations, and also show that there are distinct long hydrological periods during which water supplies change in intensity and variability. Annual water supplies (Qann) inversely correlate with both winter and summer North Atlantic Oscillation (NAO) indices. Arctic oscillation (AO) indices also influence Qann to a greater degree than NAO indices. Summer water supplies inversely correlate only with AO and NAO summer indices.

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