A novel method for cold-region streamflow hydrograph separation using GRACE satellite observations

Abstract. Streamflow hydrograph analysis has long been used for separating streamflow into baseflow and surface runoff components, providing critical information studies in hydrology, climate water resources. Issues with established methods include the lack of physics arbitrary choice separation parameters, problems identifying snowmelt runoff, limitations on watershed size hydrogeological conditions. In this study, a Gravity Recovery Climate Experiment (GRACE)-based model was developed to address these weaknesses improve separation. The is physically based requires no parameters. new compared six provided U.S. Geological Survey Groundwater Toolbox. results demonstrated improved estimates by particularly filtering out bias estimate. This specifically suitable applications over large watersheds which complementary traditional that are limited size. output from also includes hydraulic conductivity drainable storage, useful parameters evaluating aquifer properties, calibrating validating hydrological models, assessing regional