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TitleLong-term water budget imbalances and error sources for cold region drainage basins
AuthorWang, SORCID logo; Huang, JORCID logo; Yang, D; Pavlic, G; Li, J
SourceHydrological Processes 2014 p. 1-12,
Alt SeriesEarth Sciences Sector, Contribution Series 20140255
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Subjectshydrogeology; Nature and Environment; drainage; drainage systems; watersheds; hydrologic budget; surface waters; evaporation; models; cold regions research; GRACE; EALCO
Illustrationslocation maps; tables; plots
ProgramRemote Sensing Science
Released2014 10 14
AbstractThis study assessed the long-term (1979–2008) water budget closures for 19 large cold region drainage basins in Canada using recently developed datasets for precipitation (P), land surface evapotranspiration and water surface evaporation, and observed streamflow. Total water storage (TWS) trends from the GRACE satellite observations were also used to assist the assessment. The objectives are to quantify the magnitudes and spatial patterns of the water budget imbalance (e) and its source of errors for these cold region basins. Results showed that the water budget was closed within 10% of the P on average for all the basins. The e showed a general pattern of positive values in the south and negative values in the north and mountainous regions over the country. Basins with large e values were mostly found in the north. Uncertainties in the water budget variables, particularly P, were found to play a major role in the e. Significant trends in TWS were found over 11 basins, which accounted for 31% of their e on average. Improvements in the observation network, data quality assurance, and spatial models for P are critical for further improving the water budget closure for the cold region drainage basins. © 2014 Her Majesty the Queen in Right of Canada. Hydrological Processes.
Summary(Plain Language Summary, not published)
This paper presents a key step towards the national scale water mapping and accounting using satellite observations. The paper develops methods to characterise the long-term (1979-2010) variations of the water budget at national scale by using satellite imageries, field measurements, and models. The methods developed represent state-of-the-art technology for integrating multi-satellite data in mapping large scale water resources. The results could support the trans-boundary water budgeting and the impacts assessment of climate change or resources development on water resources, such as glacier shrinkage, snow cover decrease and oil sands development. The paper also identified future research directions in addressing current knowledge and data gaps for better understanding Canada's water resources. This study is led by CCMEO, and collaborated with the National Hydrology Research Centre of Environment Canada, Canadian Forest Service, and Surveyor's General Branch.

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