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TitleA novel method for cold region streamflow hydrograph separation using GRACE satellite observations
 
AuthorWang, SORCID logo; Li, J; Russell, H A JORCID logo
SourceHydrology and Earth System Sciences 2020 p. 1-22, https://doi.org/10.5194/hess-2020-524 Open Access logo Open Access
Image
Year2020
Alt SeriesNatural Resources Canada, Contribution Series 20210072
PublisherCopernicus Publications
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceOntario
Lat/Long WENS -94.0000 -81.0000 54.0000 47.0000
Subjectsgeophysics; hydrogeology; Science and Technology; Nature and Environment; hydrography; flow regimes; remote sensing; satellite imagery; modelling; Gravity Recovery and Climate Experiment (GRACE)
Illustrationslocation maps; charts; tables; cross-plots
ProgramClimate Change Geoscience Extreme Events
ProgramCanada Centre for Remote Sensing Remote Sensing Science Program - Management
Released2020 12 01
AbstractStreamflow hydrograph analysis has long been used for separating streamflow into baseflow and surface-runoff components, providing critical information for studies in hydrology, climate and water resources. Defects known with established methods include the lack of physics and arbitrary choice of separation parameters, problems in identifying snowmelt runoff, and limitations on watershed size and hydrogeological conditions. In this study, a GRACE-based model was developed to address these weaknesses and improve hydrograph separation. The model is physically based and does not require a priori parametrisation. The new model was compared with six hydrograph separation methods provided with the U.S. Geological Survey Groundwater Toolbox. The results demonstrated robust estimate by the new model particularly in filtering out the bias of snowmelt runoff in baseflow estimate. This new model is specifically suitable for applications over large watersheds which is complementary to the traditional methods that are limited by watershed size. The output from the model also includes estimates for watershed hydraulic conductivity and drainable water storage, which are useful parameters in evaluating aquifer properties, calibrating and validating hydrological and climate models, and assessing regional water resources.
Summary(Plain Language Summary, not published)
Separating river flow into baseflow and surface-runoff components provides useful information for hydrology, climate and water resources studies, but traditional methods have critical limitations in the lack of physics, identifying snowmelt runoff, and watershed size. This study developed a novel model using the GRACE satellite observations to address these limitations. The results show that the model largely improved the hydrograph analysis particularly in filtering out the bias of snowmelt runoff in baseflow estimate. This new model filled the gap of traditional methods in hydrograph separation for large watersheds. The output from this study also includes estimates for watershed hydraulic conductivity and drainable water storage, which are important in evaluating aquifer properties, calibrating and validating hydrological and climate models, and assessing regional water resources.
GEOSCAN ID328325

 
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