| Issue |
La Houille Blanche
Number 6, Décembre 2007
|
|
|---|---|---|
| Page(s) | 70 - 77 | |
| Section | 29èmes Journées de l'Hydraulique, Variations climatiques et hydrologie : Détection, l’état de la variabilité | |
| DOI | https://doi.org/10.1051/lhb:2007085 | |
| Published online | 03 January 2008 | |
Analyse dendrochronologique des variations passées du régime hydro climatique au complexe de la grande rivière dans le Nord du Québec
Dendrochronological analysis of past hydro-climatic variations in La Grande river complex in Northern Québec
1
Centre d’études nordiques, Université Laval, Ste-Foy, Québec, Canada, G1K 7P4
2
Commission géologique du Canada, Division Québec, 490, rue de la Couronne, Québec, Québec, Canada G1K 9A9
3
Département de biologie, Université du Québec à Rimouski, 300 Des Ursulines, Rimouski, Québec, Canada G5L 3A1
4
Département des sciences biologiques, Université du Québec à Montréal, Case postale 8888, succursale Centre-ville, Montréal, Québec, Canada H3C 3P8
5
CEREGE, BP 80, Europole méditerranéen de l’Arbois, 13545 Aix-en-Provence, France
6
Département des sciences et gestion de l’environnement, Université de Liège, avenue de Longwy, 185, 6700 Arlon, Belgique
7
Institut de recherche d’Hydro-Québec, 1800 boul. Lionel-Boulet, Varennes, Québec, Canada, J3X 1S1
Auteur de correspondance : yves.begin@cen.ulaval.ca
Abstract
In order to retrace the evolution of the hydrological regime parameters with time, we have reconstructed the main hydroclimatological variables used in forecast models. The study was conducted in the region of the James Bay hydroelectric complex of La Grande. Trees occupying sites sensitive to water availability variations (xeric, mesic and hydric sites) and those sensitive to thermal conditions (depending on exposition) give the opportunity to reconstruct climate variability between years. A calibration period with instrumental data is essential and it is also important to verify the models relating rings to climate with independent data. More than one hundred tree-ring series covering more than 180 years, tens series of more than 250 years and one series covering one thousand years have been reconstructed. These tree-ring series cover an area of 320 000 km2 (800 km in longitude x 400 km in latitude). Summer temperatures, snow precipitation and seasonal water supply were reconstructed over the past 200 years by means of various tree-ring proxies: ring width, density (9 derived variables) and ratios of stable isotopes of oxygen and carbon.
© Société Hydrotechnique de France, 2007