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High effectiveness of GRACE data in daily-scale flood modeling: case study in the Xijiang River Basin, China

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Abstract

The modeling and forecasting of short-duration and high-intensity floods are of importance for flood defenses and adaptations. One of the conventional ways to model or forecast such events is to utilize hydrological models driven by meteorological and hydrological station data. However, this suffers from complicated parameter specification and large uncertainties, particularly in regions with very few gauged stations. Based on the daily downscaled Gravity Recovery and Climate Experiment (GRACE) solutions, this study employed three different machine learning models and two hydrological models for flood modeling at the daily timescale by taking the Xijiang River Basin in China as a case study. The results show that: (1) the uncertainty of daily GRACE solutions alone governs the difference between GRACE data and hydrological simulations; (2) there is a strong correlation between the high-frequency components of runoff anomalies and terrestrial water storage anomaly (TWSA), and runoff plays a dominant role in TWSA variation during floods; (3) the developed machine learning models can model runoff during floods effectively and outperform the hydrological models. The proposed comprehensive method based on remote sensing satellites provides a potential new way for flood modeling, particularly for poorly gauged regions.

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Data availability is given in Sect. 2.2.

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Acknowledgements

The numerical calculations in this paper have been done on the supercomputing system in the Supercomputing Center of Wuhan University.

Funding

This work is supported by the Visiting Researcher Fund Program of State Key Laboratory of Water Resources and Hydropower Engineering Science (Wuhan University, 2019SWG03), the National Natural Science Foundation of China (52109019), the Guangdong Basic and Applied Basic Research Foundation (2021A1515010935), and the Science and Technology Planning Project of Guangdong Province in China (2020A0505100009).

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Contributions

JH X designed the experiment and wrote the manuscript; ZL W, SL G, and XS W supervised the research. JB Y revised the manuscript; J W and CG L performed the experiment; QJ G collected the data.

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Correspondence to Xushu Wu.

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The authors declare that they have no conflict of interest.

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Xiong, J., Wang, Z., Guo, S. et al. High effectiveness of GRACE data in daily-scale flood modeling: case study in the Xijiang River Basin, China. Nat Hazards 113, 507–526 (2022). https://doi.org/10.1007/s11069-022-05312-z

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  • DOI: https://doi.org/10.1007/s11069-022-05312-z

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