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Response time of global deltas to changes in fluvial sediment supply

Author

Listed:
  • Jie Wang

    (East China Normal University
    Utrecht University
    The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University)

  • Zhijun Dai

    (East China Normal University)

  • Xuefei Mei

    (East China Normal University)

  • Huan-Feng Duan

    (The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University)

  • Jaap H. Nienhuis

    (Utrecht University)

Abstract

Fluvial sediment supply supports global delta growth, yet the relationship between these two key variables remains difficult to verify for modern river deltas. Part of the complication might be that deltas are slow to adjust to changes in fluvial sediment supply. To test this hypothesis, here we analyze yearly time series of fluvial sediment supply and delta land area changes for 60 major deltas through 1990–2020. Cross-correlations show that, globally averaged, changes in delta growth rate lag 6 years behind fluctuations in fluvial sediment supply. For the 24 deltas with increased sediment supply, the lag time of land change rates was reduced to 1 year; while the 36 deltas supplied with lower fluvial sediment loads lagged by 6 years. High sediment availability in river-dominated deltas leads to a quicker response of delta land area to upstream supply changes, and deltas with stronger tidal dominance have a subdued response with long lag times. Our findings here highlight the high vulnerability of deltas and their ecosystems to changing external drivers.

Suggested Citation

  • Jie Wang & Zhijun Dai & Xuefei Mei & Huan-Feng Duan & Jaap H. Nienhuis, 2025. "Response time of global deltas to changes in fluvial sediment supply," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60531-9
    DOI: 10.1038/s41467-025-60531-9
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    References listed on IDEAS

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    4. J. H. Nienhuis & A. D. Ashton & D. A. Edmonds & A. J. F. Hoitink & A. J. Kettner & J. C. Rowland & T. E. Törnqvist, 2020. "Global-scale human impact on delta morphology has led to net land area gain," Nature, Nature, vol. 577(7791), pages 514-518, January.
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