Effects of vegetation expansion on morphodynamics of tidal channel networks

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Yin Zuo, Leihua Zhao, Xinchen Wang, Pei Xin
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Abstract

Evolution of coastal landforms, including the formation and development of tidal channel networks in salt marshes, is shaped by the interaction of surface water hydrodynamics, sediment transport and vegetation dynamics. However, the impact of vegetation expansion on tidal channel geomorphology remains unclear. In this study, an ecogeomorphic model coupling abiotic and biotic processes was developed to investigate the effects of vegetation expansion (i.e., seeding and cloning) on tidal channel morphodynamics. The numerical model results demonstrate that vegetation expansion promotes the formation and development of tidal channels. With vegetation cover, the number, total length, area and volume of tidal channels markedly increase. Vegetation also reshapes the cross-sections of tidal channels, increasing channel depths and decreasing their width-to-depth ratios. The synergistic effect of seeding and cloning is more significant than either process alone, leading to enhanced flow convergence and bed shear stress. Consequently, the channel erosion is enhanced, laying the foundational framework for the formation and growth of tidal channel networks. A high expansion rate enhances the effect of vegetation on tidal channel morphodynamics, leading to more developed tidal channel networks. This study focuses on tidal channel networks in salt marsh ecosystems and advances understanding of the geomorphological evolution of tidal channel networks subject to vegetation expansion, and it offers further implications for the management of coastal wetland ecosystems.

Abstract Image

植被扩张对潮道网形态动力学的影响
沿海地貌的演变,包括盐沼潮汐通道网络的形成和发展,是由地表水流体动力学、泥沙运移和植被动力学相互作用形成的。然而,植被扩张对潮道地貌的影响尚不清楚。本研究建立了一个耦合非生物和生物过程的生态地貌模型,以研究植被扩张(即播种和克隆)对潮道形态动力学的影响。数值模拟结果表明,植被扩张促进了潮道的形成和发展。随着植被的覆盖,潮汐通道的数量、长度、面积和体积均显著增加。植被也重塑了潮汐通道的横截面,增加了通道深度,降低了通道的宽深比。播种和克隆的协同效应比单独的任何一个过程都更显著,导致水流收敛和床层剪应力增强。因此,河道侵蚀加剧,为潮汐河道网的形成和发展奠定了基础框架。较高的扩张率增强了植被对潮道形态动力学的影响,导致潮道网更加发达。本研究以盐沼生态系统中的潮汐通道网络为研究对象,进一步了解植被扩张下潮汐通道网络的地貌演变,为滨海湿地生态系统的管理提供参考。
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来源期刊
Earth Surface Processes and Landforms
Earth Surface Processes and Landforms 地学-地球科学综合
CiteScore
6.40
自引率
12.10%
发文量
215
审稿时长
4 months
期刊介绍: Earth Surface Processes and Landforms is an interdisciplinary international journal concerned with: the interactions between surface processes and landforms and landscapes; that lead to physical, chemical and biological changes; and which in turn create; current landscapes and the geological record of past landscapes. Its focus is core to both physical geographical and geological communities, and also the wider geosciences
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