Daiki Ikeshima
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A Framework for Estimating Global‐Scale River Discharge by Assimilating Satellite Altimetry Open
Understanding spatial and temporal variations in terrestrial waters is key to assessing the global hydrological cycle. The future Surface Water and Ocean Topography (SWOT) satellite mission will observe the elevation and slope of surface w…
A framework for estimating global-scale river discharge by assimilating satellite altimetry Open
Earth and Space Science Open Archive This work was has been accepted for publication in Water Resources Research. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary. Learn mor…
MERIT Hydro: A High‐Resolution Global Hydrography Map Based on Latest Topography Dataset Open
High‐resolution raster hydrography maps are a fundamental data source for many geoscience applications. Here we introduce MERIT Hydro, a new global flow direction map at 3‐arc sec resolution (~90 m at the equator) derived from the latest e…
A Physically Based Empirical Localization Method for Assimilating Synthetic SWOT Observations of a Continental-Scale River: A Case Study in the Congo Basin Open
Water resource management has faced challenges in recent decades due to limited in situ observations and the limitations of hydrodynamic modeling. Data assimilation techniques have been proposed to improve hydrodynamic model outputs of loc…
A high‐accuracy map of global terrain elevations Open
Spaceborne digital elevation models (DEMs) are a fundamental input for many geoscience studies, but they still include nonnegligible height errors. Here we introduce a high‐accuracy global DEM at 3″ resolution (~90 m at the equator) by eli…
APPLICATION OF DATA ASSIMILATION FOR A GLOBAL RIVER MODEL: A VIRTUAL EXPERIMENT AT THE AMAZON BASIN Open
本研究ではSWOT衛星の擬似観測を全球河川モデルCaMa-FloodにLETKFでデータ同化する仮想実験を,アマゾン川流域全体を対象に行なった.水面標高の疑似観測を同化することで,陸面流出量に誤差を含んだシミュレーションに関しても地表水動態の再現精度を向上できた.比較的小さな大陸河川を対象とした既往研究とは異なり大河川の流域全体が対象のデータ同化では,上流の補正効果が下流へ伝搬するため,上流からの流入量が大きな地点では擬似観測が無い時でも河川流量の再現精度が大幅に向上した.…
THE SPATIAL RESOLUTION IMPROVEMENT OF GLOBAL WATER BODY MAP USING MULTI-TEMPORAL LANDSAT DATA Open
Separation of permanent water body and temporal water body is essential for the grasp of global water distribution. Global 3-second Water Body Map (G3WBM) is a global scale high-resolution water body map recently-developed by the authors, …