Recent trends and variability in river discharge across northern Canada
This 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...
Published in: | Hydrology and Earth System Sciences |
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Copernicus Publications
2016
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Online Access: | https://doi.org/10.5194/hess-20-4801-2016 http://www.hydrol-earth-syst-sci.net/20/4801/2016/hess-20-4801-2016.pdf https://doaj.org/article/9958fa25940a4ff2a39e9dd4ce2bf3d9 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:9958fa25940a4ff2a39e9dd4ce2bf3d9 2023-05-15T14:51:56+02:00 Recent trends and variability in river discharge across northern Canada S. J. Déry T. A. Stadnyk M. K. MacDonald B. Gauli-Sharma 2016-12-01 https://doi.org/10.5194/hess-20-4801-2016 http://www.hydrol-earth-syst-sci.net/20/4801/2016/hess-20-4801-2016.pdf https://doaj.org/article/9958fa25940a4ff2a39e9dd4ce2bf3d9 en eng Copernicus Publications 1027-5606 1607-7938 doi:10.5194/hess-20-4801-2016 http://www.hydrol-earth-syst-sci.net/20/4801/2016/hess-20-4801-2016.pdf https://doaj.org/article/9958fa25940a4ff2a39e9dd4ce2bf3d9 undefined Hydrology and Earth System Sciences, Vol 20, Iss 12, Pp 4801-4818 (2016) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.5194/hess-20-4801-2016 2023-01-22T17:51:21Z This 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, CV = 16 %) 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 (CV = 7 %). 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. Article in Journal/Newspaper Arctic Arctic Ocean Bering Sea La Grande Rivière Labrador Sea James Bay Unknown Arctic Arctic Ocean Bering Sea Canada Hudson Kendall ENVELOPE(-59.828,-59.828,-63.497,-63.497) La Grande Rivière ENVELOPE(-79.000,-79.000,53.834,53.834) Hydrology and Earth System Sciences 20 12 4801 4818 |
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envir geo S. J. Déry T. A. Stadnyk M. K. MacDonald B. Gauli-Sharma Recent trends and variability in river discharge across northern Canada |
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envir geo |
description |
This 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, CV = 16 %) 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 (CV = 7 %). 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. |
format |
Article in Journal/Newspaper |
author |
S. J. Déry T. A. Stadnyk M. K. MacDonald B. Gauli-Sharma |
author_facet |
S. J. Déry T. A. Stadnyk M. K. MacDonald B. Gauli-Sharma |
author_sort |
S. J. Déry |
title |
Recent trends and variability in river discharge across northern Canada |
title_short |
Recent trends and variability in river discharge across northern Canada |
title_full |
Recent trends and variability in river discharge across northern Canada |
title_fullStr |
Recent trends and variability in river discharge across northern Canada |
title_full_unstemmed |
Recent trends and variability in river discharge across northern Canada |
title_sort |
recent trends and variability in river discharge across northern canada |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/hess-20-4801-2016 http://www.hydrol-earth-syst-sci.net/20/4801/2016/hess-20-4801-2016.pdf https://doaj.org/article/9958fa25940a4ff2a39e9dd4ce2bf3d9 |
long_lat |
ENVELOPE(-59.828,-59.828,-63.497,-63.497) ENVELOPE(-79.000,-79.000,53.834,53.834) |
geographic |
Arctic Arctic Ocean Bering Sea Canada Hudson Kendall La Grande Rivière |
geographic_facet |
Arctic Arctic Ocean Bering Sea Canada Hudson Kendall La Grande Rivière |
genre |
Arctic Arctic Ocean Bering Sea La Grande Rivière Labrador Sea James Bay |
genre_facet |
Arctic Arctic Ocean Bering Sea La Grande Rivière Labrador Sea James Bay |
op_source |
Hydrology and Earth System Sciences, Vol 20, Iss 12, Pp 4801-4818 (2016) |
op_relation |
1027-5606 1607-7938 doi:10.5194/hess-20-4801-2016 http://www.hydrol-earth-syst-sci.net/20/4801/2016/hess-20-4801-2016.pdf https://doaj.org/article/9958fa25940a4ff2a39e9dd4ce2bf3d9 |
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undefined |
op_doi |
https://doi.org/10.5194/hess-20-4801-2016 |
container_title |
Hydrology and Earth System Sciences |
container_volume |
20 |
container_issue |
12 |
container_start_page |
4801 |
op_container_end_page |
4818 |
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