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    风暴事件影响下黄河口潮滩沉积动力响应:认识与展望

    Sediment dynamic response of tidal flats in the Yellow River estuary under storm events: insights and prospects

    • 摘要: 黄河三角洲因高输沙量、人类活动频繁及风暴事件频发,成为研究多重胁迫动力作用下潮滩变化的典型区域。本文系统总结了前人关于风暴事件影响黄河口潮滩沉积动力过程的研究结果,并分析了风暴事件与人为干预叠加带来的新挑战。风暴期间,黄河三角洲潮滩的水动力特征、物质输运及冲淤演化均存在显著的空间差异。现行河口口门附近,波浪作用主导了潮滩泥沙再悬浮过程,而刁口及莱州湾沿岸潮滩的泥沙再悬浮过程则由风生流及风暴潮主导。在盛行风向条件下(NE-N),刁口及现行口门西侧潮滩悬浮泥沙主要向岸输运、潮滩有加积趋势,而莱州湾沿岸则相反。人为干预为风暴事件期间潮滩沉积动力响应带来了新的变化。黄河口潮滩的盐沼植被特别是互花米草有显著的促淤作用,而互花米草清除工程可能加剧风暴侵蚀潮滩的风险。调水调沙期间泥沙脉冲式入海与向岸风暴事件的叠加,可增强潮滩的淤积效率。在极端事件频率增加及极向迁移的背景下,未来仍需在人为干预与风暴事件的叠加效应、风暴事件影响的季节差异等方面开展研究,为黄河三角洲潮滩生态保护与灾害防控提供科学支撑。

       

      Abstract: The Yellow River Delta, characterized by high sediment discharge, frequent human activities, and recurrent storm events, serves as a typical region for studying tidal flat changes under multiple stressors. This paper systematically synthesizes previous research on storm-induced sediment dynamic processes in the Yellow River Estuary’s tidal flats and analyzes emerging challenges arising from the combined effects of storms and human activities. During storms, hydrodynamic characteristics, sediment transport, and erosion-deposition patterns exhibit significant spatial heterogeneity across the delta. Wave effect dominates sediment resuspension on tidal flats near the current river estuary, while currents controlled by wind-driven flows and storm surges are prominent along the Diaokou and Laizhou Bay areas. Under prevailing northeasterly or northerly winds, onshore sediment transport and accretion trends are observed in the Diaokou and western current estuary regions, whereas offshore transport dominates along Laizhou Bay. Human interventions further modulate storm-driven sediment dynamic responses: salt marsh vegetation, particularly Spartina alterniflora, enhances sediment deposition, yet its removal projects may exacerbate storm-induced erosion risks. The synergistic effect of pulsed sediment discharge during Water-Sediment Regulation and onshore storm events can amplify tidal flat accretion efficiency. Against the backdrop of increasing storm frequency and poleward migration, future studies should prioritize investigating the combined effects of human interventions and storm events, as well as seasonal variations in storm impacts, to provide scientific support for ecological conservation and hazard mitigation in the tidal flats of the Yellow River Delta.

       

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