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TitleLes archives paléo-hydrologiques de Grand Lake, Labrador
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorFortin, D; Francus, P
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. 188-193, 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
ProvinceNewfoundland and Labrador
NTS13F/07; 13F/08; 13F/09; 13F/10
AreaGrand Lake; Labrador; Sheshatshiu; North West River
Lat/Long WENS -61.0000 -60.0000 53.7500 53.2500
Subjectsenvironmental geology; hydrogeology; surficial geology/geomorphology; stratigraphy; Nature and Environment; Science and Technology; surface waters; lakes; lake sediment cores; lake sediment thickness; varves; laminations; climatology; paleoclimatology; hydrologic environment; runoff; paleoenvironment; floods; snow; Le projet ARCHIVES; lacustrine sediments; Climate change; Hydrology; Boreal ecosystems; Forests; Trees; Phanerozoic; Cenozoic; Quaternary
Illustrationsphotographs; time series
ProgramClimate Change Geoscience Extreme Events
Released2021 06 28
AbstractSediments accumulated at the bottom of Grand Lake, located near the communities of North West River and the Innu First Nation of Sheshatshiu, Labrador, constitute an exceptional paleo-environmental archive. Their thin annual layers (varves) were analyzed in a manner similar to the annual growth rings of trees. The varves are formed due to the great depth of the lake (> 200 meters) and the large quantity of fine particles carried by its main tributary during flood periods. Analysis of sediments collected from various locations on the lake-bottom indicates that the varve thickness has declined over the past 150 years and that the interannual variability of floods has also decreased considerably during this period. We attribute these changes to a decrease in snow cover and in the intensity of the spring melt during the study period.
Summary(Plain Language Summary, not published)
The main objective of the ARCHIVES project was to develop a new methodological approach aiming at reconstituting the long-term natural variability of hydro-climatic parameters used in the modeling of water inflows in basins of interest for hydroelectric production in Quebec. At the end of the project, hydropower resource managers and authorities concerned about climate change can benefit from a better understanding of the evolution in time and space of hydro-climatic conditions that will facilitate the development of appropriate hydrological scenarios for this region that is sensitive in many ways to climate change. This document presents a synthesis of the results produced by the multidisciplinary team of this five-year project, which took place over the entire boreal zone of Quebec and part of Labrador. This synthesis is structured in 21 chapters grouped in three distinct parts. The first part is divided into five chapters presenting fundamental concepts and prerequisites for reading the other sections of the document. The second part, which includes seven chapters, presents the treatment and meaning of the indicators used in the project. Finally, the nine chapters of the third part of the document present a retrospective analysis of the hydro-climate over the last centuries, or even millennia depending on the indicators.

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