Recent trends and variability in river discharge across northern Canada

Simple item page
dc.contributor.authorDery, Stephen J.
dc.contributor.authorStadnyk, Tricia A.
dc.contributor.authorMacDonald, Matthew K.
dc.contributor.authorGauli-Sharma, Bunu
dc.date.accessioned2020-07-10T16:27:06Z
dc.date.available2020-07-10T16:27:06Z
dc.date.issued2016-12-08
dc.date.submitted2020-07-10T16:27:06Zen_US
dc.description.abstractThis study presents an analysis of the observed inter-annual variability and inter-decadal trends in river discharge across northern Canada for 1964–2013. The 42 rivers chosen for this study span a combined gauged area of 5.26 106 km2 and are selected based on data availability and quality, gauged area and record length. Inter-annual variability in river discharge is greatest for the eastern Arctic Ocean (coefficient of variation, CVD16 %) due to the Caniapiscau River diversion into the La Grande Rivière system for enhanced hydropower production. Variability is lowest for the study area as a whole (CVD7 %). Based on the Mann–Kendall test (MKT), no significant (p > 0.05) trend in annual discharge from 1964 to 2013 is observed in the Bering Sea, western Arctic Ocean, western Hudson and James Bay, and Labrador Sea; for northern Canada as a whole, however, a statistically significant (p < 0.05) decline of 102.8 km3 25 yr􀀀1 in discharge occurs over the first half of the study period followed by a statistically significant (p < 0.05) increase of 208.8 km3 25 yr􀀀1 in the latter half. Increasing (decreasing) trends in river discharge to the eastern Hudson and James Bay (eastern Arctic Ocean) are largely explained by the Caniapiscau diversion to the La Grande Rivière system. Strong regional variations in seasonal trends of river discharge are observed, with overall winter (summer) flows increasing (decreasing, with the exception of the most recent decade) partly due to flow regulation and storage for enhanced hydropower production along the Hudson and James Bay, the eastern Arctic Ocean and Labrador Sea. Flow regulation also suppresses the natural variability of river discharge, particularly during cold seasons.en_US
dc.identifier.citationDéry, S. J., Stadnyk, T. A., MacDonald, M. K., and Gauli-Sharma, B.: Recent trends and variability in river discharge across northern Canada, Hydrol. Earth Syst. Sci., 20, 4801–4818, https://doi.org/10.5194/hess-20-4801-2016, 2016.en_US
dc.identifier.doihttps://doi.org/10.5194/hess-20-4801-2016
dc.identifier.urihttp://hdl.handle.net/1993/34769
dc.publisherCopernicus Publicationsen_US
dc.rightsopen accessen_US
dc.subjectRiver dischargeen_US
dc.subjectCanadaen_US
dc.titleRecent trends and variability in river discharge across northern Canadaen_US
dc.typeTechnical Reporten_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
dery-et-al.-2016.pdf
Size:
8.62 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed to upon submission
Description:
Download
Collections
Research Documents and Reports