Local and Regional Trends in Monthly Maximum Flows in Southern British Columbia
- 1 January 2002
- journal article
- Published by Taylor & Francis in Canadian Water Resources Journal / Revue canadienne des ressources hydriques
- Vol. 27 (2) , 191-212
- https://doi.org/10.4296/cwrj2702191
Abstract
The potential impact of climate change on the hydrologic regime is an important topic in contemporary hydrology. A number of studies have been conducted to identify climate change signals in annual maximum flood records. However less attention has been paid to changes in the regime of flood events of smaller return periods. The overall trend observed in annual maximum flood records gives limited information about intra-annual changes in the hydrological regime of extreme flows. The trends in monthly maximum flows at local and regional scales in a hydro-climatologically homogeneous region from a 40-year common observation period are explored in this study. Trends are identified using the Mann-Kendall non-parametric test with a modification for auto-correlated data. The regional significance of trends identified at the local scale is evaluated by means of a regional bootstrap algorithm that preserves the regional cross-correlation structure. Regional average magnitudes of the trend in monthly maximum flows ... Les répercussions éventuelles du changement climatique sur le régime hydrologique constituent un thème important de l’hydrologie contemporaine. Un certain nombre d’études ont été menées pour cerner les indices de changement climatique dans les enregistrements de crues maximales annuelles. Cependant, une attention moins grande a été portée aux changements touchant le régime des inondations des périodes de retour plus courtes. La tendance globale observée pour les enregistrements de crues maximales annuelles fournit des données limitées à propos des changements intra-annuels du régime hydrologique des débits extrêmes. Dans cette étude sont analysées les tendances des écoulements maximums mensuels aux échelles locale et régionale dans une région considérée comme homogène d’un point de vue hydro-climatologique, en fonction d’une période d’observation commune de 40 ans. Les tendances sont dégagées à l’aide du test non paramétrique de Mann-Kendall avec une modification pour les données auto-corrélées. L’importa...Keywords
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