河口海岸中长时间尺度动力地貌系统模拟研究与进展
Medium- to long-term morphodynamic modelling in estuaries and coasts: Principles and applications
查看参考文献68篇
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文摘
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我国河口海岸动力沉积和动力地貌研究以沉积学和地貌学的方法侧重静态描述,动力地貌相互作用的定量研究不多,与缺少动力地貌模型技术有关。本文介绍了中长时间尺度的河口海岸动力地貌模型技术及其发展和应用,讨论了决定动力地貌演变的泥沙余输运及引起泥沙余输运的主要动力因子,介绍了动力地貌模型的应用进展,进而分析了河口海岸地貌过程的机制和地貌平衡系统。本文指出对淤泥质及复杂动力条件下的河口海岸动力地貌过程还有待进一步研究。 |
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其他语种文摘
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The interplay between hydrodynamics, sediment transports and geometrical constraints govern the evolution of large scale estuarine and coastal morphological features. On a long time scale (> decades) sea level rise, and changing regimes in river discharge and sediment supply may influence morphological evolution as well. Spatial gradients in tide residual sediment transport cause the morphodynamic development. Relevant mechanisms are the Stokes' drift, tidal asymmetry, wave skewness, settling and scour lag, estuarine gravitational circulation, and residual transport driven by river discharge or wind. Morphodynamic models consider these physical processes and include a feedback between hydrodynamics and morphological development. Process-based morphodynamic models may deploy process and input reduction techniques to accelerate developments focusing on major processes. An example is the morphological acceleration factor to account for the different time scales of morphodynamic evolution and hydrodynamic processes. Process-based numerical models are able to reproduce realistic morphology, such as channel-shoal patterns and delta distributary channel formation. These models are also able to hindcast historical estuarine and coastal morphodynamic evolutions and to predict morphological response to sea level rise in future. So far, limited attention has been paid to muddy systems and river flow impact thus requiring further research effort. |
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来源
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地理学报
,2013,68(9):1182-1196 【核心库】
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DOI
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10.11821/dlxb201309003
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关键词
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河口
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海岸
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动力地貌
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泥沙余输运
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数学模型
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地址
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1.
华东师范大学, 河口海岸学国家重点实验室, 上海, 200062
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UNESCO-IHE(DA Delft,the Netherlands), the Netherlands, DA Delft, 2601
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语种
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中文 |
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文献类型
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综述型 |
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ISSN
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0375-5444 |
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学科
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海洋学 |
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基金
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国家自然科学基金
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国家自然科学基金
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上海市科委重大项目
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水利部公益性行业科研专项
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文献收藏号
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CSCD:4946542
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