Preprints
https://doi.org/10.5194/nhess-2023-165
https://doi.org/10.5194/nhess-2023-165
29 Nov 2023
 | 29 Nov 2023
Status: this preprint was under review for the journal NHESS. A revision for further review has not been submitted.

The contribution of diminishing river sand loads to beach erosion worldwide

Vincent Regard, Rafael Almar, Marcan Graffin, Sébastien Carretier, Edward Anthony, Roshanka Ranasinghe, and Pierre Maffre

Abstract. The erosion of sandy beaches can have a profound impact on human activities and ecosystems, especially on developed coasts. The scientific community has, to date, primarily focused on the potential impact of changes in sea level and waves on sandy beaches. While being abundantly recognized at local to regional scales in numerous studies over the last two decades, the contribution of diminishing fluvial sediment supply to sandy beach erosion at the global scale is still to be investigated. Here, we present a model of sediment budget computed from the balance between land riverine input and coastal transport. It results in a global picture of sand pathway from land to sea. Our analysis demonstrates the massive impact of the thousands of river dams on beach erosion worldwide. Sand can be mobilized with wave-induced longshore transport over large distances, in general toward the equator, within sediment cells, often at distance from the outlets.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Vincent Regard, Rafael Almar, Marcan Graffin, Sébastien Carretier, Edward Anthony, Roshanka Ranasinghe, and Pierre Maffre

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2023-165', Anonymous Referee #1, 28 Dec 2023
    • AC1: 'Reply on RC', Vincent Regard, 30 Apr 2024
  • RC2: 'Comment on nhess-2023-165', Anonymous Referee #2, 06 Feb 2024
    • AC2: 'Reply on RC', Vincent Regard, 30 Apr 2024

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2023-165', Anonymous Referee #1, 28 Dec 2023
    • AC1: 'Reply on RC', Vincent Regard, 30 Apr 2024
  • RC2: 'Comment on nhess-2023-165', Anonymous Referee #2, 06 Feb 2024
    • AC2: 'Reply on RC', Vincent Regard, 30 Apr 2024
Vincent Regard, Rafael Almar, Marcan Graffin, Sébastien Carretier, Edward Anthony, Roshanka Ranasinghe, and Pierre Maffre
Vincent Regard, Rafael Almar, Marcan Graffin, Sébastien Carretier, Edward Anthony, Roshanka Ranasinghe, and Pierre Maffre

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Short summary
The erosion of sandy beaches affects human activities and ecosystems. Research has mainly focused on sea level and wave changes, and while localized sediment research is abundant, the global effect of reduced fluvial sediment supply remains unexplored. This study presents a global sediment model that demonstrates the significant impact of river dams on beach erosion worldwide. Sediment can travel long distances via wave-induced transport, often away from river outlets.
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