Longshore Sediment Transport Across a Tombolo Determined by Two Adjacent Circulation Cells DOI
Danghan Xie, Zoe J. Hughes, Duncan M. FitzGerald

et al.

Journal of Geophysical Research Earth Surface, Journal Year: 2024, Volume and Issue: 129(10)

Published: Sept. 27, 2024

Abstract Longshore sediment transport (LST) is essential for shaping sandy shorelines. Many shorelines are complex and indented, containing headlands, offshore islands tombolos. Tombolos often form between the mainland; however, conditions LST across tombolos unclear. This question important because reinforced with anthropogenic infrastructure, potentially causing starvation of downdrift beaches. Along many shorelines, return to a tombolo's natural condition has been proposed promote connectivity counteract erosion. Nevertheless, implications such restorations remain uncertain. In this study, we employ Delft3D wave‐current model investigate hydrodynamics dynamics tombolo, examining its role as connector adjacent Contrary expectations, our simulations show only diminutive longshore currents from updrift beach tombolo unless wave heights exceed 8 m. Instead, predominant crossing originate island, driven by storm‐induced water level differences circulation cells on both sides tombolo. The island shelters domain, resulting in higher energy dissipation Further, increasing height or approach angle not intensifies but also relocates cells, enhancing total However, general, deposition side domain does compensate loss beach. We conclude that limited occurs under extreme conditions.

Language: Английский

Longshore Sediment Transport Across a Tombolo Determined by Two Adjacent Circulation Cells DOI
Danghan Xie, Zoe J. Hughes, Duncan M. FitzGerald

et al.

Journal of Geophysical Research Earth Surface, Journal Year: 2024, Volume and Issue: 129(10)

Published: Sept. 27, 2024

Abstract Longshore sediment transport (LST) is essential for shaping sandy shorelines. Many shorelines are complex and indented, containing headlands, offshore islands tombolos. Tombolos often form between the mainland; however, conditions LST across tombolos unclear. This question important because reinforced with anthropogenic infrastructure, potentially causing starvation of downdrift beaches. Along many shorelines, return to a tombolo's natural condition has been proposed promote connectivity counteract erosion. Nevertheless, implications such restorations remain uncertain. In this study, we employ Delft3D wave‐current model investigate hydrodynamics dynamics tombolo, examining its role as connector adjacent Contrary expectations, our simulations show only diminutive longshore currents from updrift beach tombolo unless wave heights exceed 8 m. Instead, predominant crossing originate island, driven by storm‐induced water level differences circulation cells on both sides tombolo. The island shelters domain, resulting in higher energy dissipation Further, increasing height or approach angle not intensifies but also relocates cells, enhancing total However, general, deposition side domain does compensate loss beach. We conclude that limited occurs under extreme conditions.

Language: Английский

Citations

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