Estimating Winter Streamflow Using Conceptual Streamflow Model
Publication: Journal of Cold Regions Engineering
Volume 14, Issue 4
Abstract
Ice-affected periods represent a significant portion of the annual hydrograph for most Canadian hydrometric stations. Because the stage-discharge relation is not reliable under ice-cover conditions, Water Survey of Canada subjectively interpolates winter streamflow from as few as two observations of discharge during the ice-covered season, which may last 6 months or longer. An alternative method of producing discharge estimates is proposed that uses a combination of conceptual and statistical hydrological modeling to overcome limitations in both the availability of data and our understanding of relevant processes. A conceptual hydrological model is tested to evaluate the utility of this approach for data-sparse regions. When model predictions were adjusted to fit two winter measurements, 79% of all verification measurements were within 20% of predicted estimates. There was a seasonal bias to the error distribution, with most measurements within the first 30 days after freeze-up being less than predicted and most measurements after April 1 being greater than predicted. These deviations probably result from hydraulic and hydrologic processes not represented within the model.
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Information & Authors
Information
Published In
Journal of Cold Regions Engineering
Volume 14 • Issue 4 • December 2000
Pages: 158 - 175
History
Received: Aug 19, 2000
Published online: Dec 1, 2000
Published in print: Dec 2000
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