Cross-shore parallel tidal channel systems formed by alongshore currents

Zeng Zhou, Yizhang Wei, Liang Geng (), Ying Zhang, Yuxian Gu, Alvise Finotello, Andrea D’Alpaos, Zheng Gong, Fan Xu (), Changkuan Zhang and Giovanni Coco
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Zeng Zhou: Hohai University
Yizhang Wei: Hohai University
Liang Geng: Hohai University
Ying Zhang: Hohai University
Yuxian Gu: Hohai University
Alvise Finotello: University of Padova
Andrea D’Alpaos: University of Padova
Zheng Gong: Hohai University
Fan Xu: East China Normal University
Changkuan Zhang: Hohai University
Giovanni Coco: University of Auckland

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Parallel tidal channel systems, characterized by commonly cross-shore orientation and regular spacing, represent a distinct class of tidal channel networks in coastal environments worldwide. Intriguingly, these cross-shore oriented channel systems can develop in environments dominated by alongshore tidal currents, for which the mechanisms remain elusive. Here, we combine remote sensing imagery analysis and morphodynamic simulations to demonstrate that the deflection of alongshore tidal currents at transitions in bed elevation determines the characteristic orientation of the parallel tidal channels. Numerical results reveal that sharp changes in bed elevation lead to nearly 90-degree intersection angles, while smoother transitions in bed profiles result in less perpendicular channel alignments. These findings shed light on the potential manipulation of tidal channel patterns in coastal wetlands, thus equipping coastal managers with a broader range of strategies for the sustainable management of these vital ecosystems in the face of climate change and sea level rise.

Date: 2024
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DOI: 10.1038/s41467-024-49176-2

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