河口海岸沉积层理特征与形成机制

Sedimentary Stratigraphic Characteristics and Formation Mechanisms of Estuarine Coasts

  • 摘要: 河口海岸地处海陆交界带, 其沉积层理特征与形成机制是沉积动力学、动力地貌学和地层学等学科方向的研究热点, 对评价海岸工程环境效应、重建沉积古环境等具有重要参考价值。通过梳理河口海岸区域径流、潮汐、波浪等多种动力因子作用的研究成果, 归纳不同动力主导作用形成的沉积层理特征, 剖析3种基本动力对沉积层理塑造的动力学机制, 阐释洪水、风暴偶发动力因子以及生物扰动、海平面变化、围垦工程等其他影响因子对沉积层理形成和保存的作用机理。同时, 总结了数值模拟手段在沉积层理形成和破坏机制解译方面的应用及取得的机理认知, 提出在河口海岸沉积层理时空尺度认知、多因素耦合反演模型开发应用等方面有待进一步研究的科学问题。

     

    Abstract: Estuarine and coastal areas, located at the interface between the sea and land, are heavily impacted by human activities such as coastal engineering projects. Strategies for managing impacts are diverse, and depend on the geomorphology, evolution history and dominant processes shaping the system. Techniques such as observing the sedimentary stratigraphic characteristics and coastal numerical modelling have been used to better understand these formative processes. Here we review research findings linking hydrodynamic factors (e.g., river, tide, and wave) in estuarine and coastal regions to the sedimentary stratigraphic characteristics that are associated with different hydrodynamic processes. The mechanisms through which these forces shape the sedimentary stratigraphy are analyzed, along with episodic dynamic factors such as floods and storms, along with other influencing factors like biological disturbance, sea-level changes, and reclamation projects; all of these affect the formation and preservation of sedimentary stratigraphy. Additionally, the application and mechanistic understanding of numerical methods of interpreting the formation and destruction mechanisms of sedimentary layering are discussed. Finally, some future research directions are proposed, including e.g., the need of research at the spatiotemporal scales of estuarine and coastal sedimentary layering, and the development of multifactor coupled numerical models.

     

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