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Bridging the Temporal Gaps in GRACE/GRACE–FO Terrestrial Water Storage Anomalies over the Major Indian River Basins Using Deep Learning

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Abstract

Temporal gaps in the Gravity Recovery and Climate Experiment (GRACE) and GRACE–FO missions pose difficulties in analyzing spatiotemporal variations of terrestrial water storage (TWS) anomalies over Indian river basins. In this study, we developed a deep learning-based CNN–LSTM model to address these temporal gaps by integrating GRACE–TWS with other meteorological variables. The model achieved a strong Pearson’s correlation coefficient (median of 0.96 in training, 0.92 in testing), high Nash–Sutcliffe efficiency (0.91 in training, 0.85 in testing) and low normalized root-mean-squared error (0.064 in training, 0.098 in testing) when compared to the original GRACE–TWS. Moreover, a comparison with two publicly available global datasets suggests the superior performance of CNN–LSTM in predicting TWSA (terrestrial water storage anomalies). The study also highlighted potential biases up to 2 cm/yr in long-term TWSA trends due to temporal gaps in GRACE/GRACE–FO. Additionally, the estimated TWSA matched well with in situ wells across majority of the Indian river basins. The findings revealed significant groundwater depletion in the northern and northwestern river basins but positive trends in the central and southern basins in India. Overall, the estimated TWSA product developed in this study provides continuous data records and valuable insights into long-term trends in groundwater storage, making it useful for groundwater monitoring.

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Acknowledgments

This work was supported by the Department of Science & Technology (DST-FIST/197/2018-19/580) Government of India.

Funding

This work was supported by the Department of Science & Technology (DST-FIST/197/2018-19/580) Government of India.

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Authors and Affiliations

  1. Department of Applied Geophysics, IIT (ISM) Dhanbad, Dhanbad, Jharkhand, 826004, India

    Pragay Shourya Moudgil & G. Srinivasa Rao

  2. Department of Earth Science, IIT Bombay, Powai, Mumbai, 400076, India

    G. Srinivasa Rao

  3. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Beijing, China

    Kosuke Heki

  4. Department of Geosciences, University of Oslo, Oslo, Norway

    Pragay Shourya Moudgil

  5. Department of Earth and Planetary Sciences, Hokkaido University, Sapporo, Japan

    Kosuke Heki

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  1. Pragay Shourya Moudgil
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Moudgil, P.S., Rao, G.S. & Heki, K. Bridging the Temporal Gaps in GRACE/GRACE–FO Terrestrial Water Storage Anomalies over the Major Indian River Basins Using Deep Learning. Nat Resour Res 33, 571–590 (2024). https://doi.org/10.1007/s11053-024-10312-w

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