We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
The role of geological mouth islands on the morphodynamics of back-barrier tidal basins.
- Authors
Wei, Yizhang; Chen, Yining; Qiu, Jufei; Zhou, Zeng; Yao, Peng; Jiang, Qin; Gong, Zheng; Coco, Giovanni; Townend, Ian; Zhang, Changkuan
- Abstract
Researchers have extensively investigated the back-barrier islands morphodynamics using numerical methods. However, the influence of rocky mouth islands, which may be submerged by sea-level rise, has been rarely explored. Using the Dongshan Bay in southern China as a reference, this study numerically explores the long-term morphodynamic effect of geological constraints (e.g. rocky islands) for back-barrier basins. Model results indicate that the spatial configuration of mouth islands can considerably affect the morphological development of tidal basins. The presence of mouth islands narrows the inlet cross-sectional area, increasing flow velocity and residual current, resulting in more sediment suspension and transport. Meanwhile, mouth islands tend to increase erosion in the tidal basin and sedimentation in the ebb-delta area. Furthermore, the spatial distribution of mouth islands can also affect tidal basin evolution: the basin-side mouth islands tend to cause more basin erosion with higher tidal currents and more sediment transport. In contrast, the delta-side ones may increase relative sediment deposition in the basin. Finally, larger tidal prisms are observed with more mouth islands and with basin-side mouth islands, suggesting that the number and location of islands can affect the relationship between the tidal prism and inlet cross-sectional area. This modelling study furthers the understanding of barrier basin morphodynamics affected by rocky mouth islands and informs management strategies under a changing environment.
- Subjects
CHINA; TIDAL basins; SETTLING basins; TIDAL currents; ISLANDS; SEDIMENTATION &; deposition; SEDIMENT transport
- Publication
Earth Surface Dynamics, 2022, Vol 10, Issue 1, p65
- ISSN
2196-6311
- Publication type
Article
- DOI
10.5194/esurf-10-65-2022