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Can global geophysical data be useful in hydrology of river basins? Example of the GRACE satellite gravimetryтезисы доклада
- Авторы: Gelfan A., Frolova N., Krylenko I., Motoviliv Yu, Zotov L., Grigoriev V.
- Сборник: GEOINFORMATICS RESEARCH PAPERS
- Серия: BS4002
- Том: 4
- Тезисы
- Год издания: 2016
- DOI: 10.2205/2016BS08Sochi
- Аннотация: Our study investigates applicability of the Gravity Recovery and Climate Experiment (GRACE) satellite gravimetry data for estimating terrestrial water storage (TWS) in a river basin scale. Terrestrial water storage (TWS) is the integrated sum of all basin storages (surface water bodies, soil and ground aquifer, snowpack and glaciers) and the ability to estimate TWS dynamics is useful for understanding the basin’s water cycle, its interconnection with the local climate, physics of predictability of extreme hydrological events. Despite the importance of the TWS estimates, reliable ground-based monitoring data of all TWS components are scarce or absent at all. Since observations are not sufficient to monitor TWS, hydrological models are considered as a comprehensive tool to simulate TWS components at a basin scale. However accuracy of the model-derived TWS is influenced by the uncertainty of the model structure and parameters, reliability of input data. etc. To improve the TWS-estimates, it is reasonable to combine the simulated TWS with independent observations provided by the GRACE gravity data. Ninety-seven monthly TWS retrieval from GRACE data (from April 2002 to December 2009) was examined and compared with TWS-estimates obtained by the ECOMAG hydrological model simulations. The case study was carried out for the Northern Dvina River basin. Quantitative analyze between the hydrological model and GRACE-based TWS showed that latter is in good consistency with the simulation results on both seasonal and inter-annual time scales. Overall, the results highlight the benefit of assimilating GRACE data for hydrological applications, particularly in data-sparse regions, while also providing insight on future refinements of the methodology of GRACE-data application in watershed hydrology.
- Добавил в систему: Фролова Наталья Леонидовна