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Suspended sediment diffusion mechanisms in the Yangtze Estuary influenced by wind fields

机译：风场对长江口悬浮泥沙扩散机制的影响

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The complexity of suspended sediment concentration (SSC) distribution and diffusion has been widely recognized because it is influenced by sediment supply and various hydrodynamic forcing conditions that vary over space and over time. Sediment suspended by waves and transported by currents are the dominant sediment transport mechanisms in estuarine and coastal areas. However, it is unclear to what extent the SSC distribution is impacted by each hydrodynamic factor. Research on the quantitative influence of wind fields on the SSC diffusion range will contribute to a better understanding of the characteristics of sediment transport change and sedimentary geomorphic evolution. This study determined SSC from three Envisat Medium-Resolution Imaging Spectrometer acquisitions, covering the Yangtze Estuary and adjacent water area under the same season and tidal conditions but with varying wind conditions. SSC was examined based on the Semi-Empirical Radiative Transfer model, which has been well validated with the observation data. Integrating the corresponding wind field information from European Centre for Medium-Range Weather Forecasts further facilitated the discussion of wind fields affecting SSC, and in turn the influence of water and suspended sediment transportation and diffusion in the Yangtze estuarine and coastal area. The results demonstrated that the SSC present much more distinctive fluvial features in the inner estuary and wind fields are one of the major factors controlling the range of turbid water diffusion. (C) 2017 Elsevier Ltd. All rights reserved.
机译：悬浮沉积物浓度（SSC）分布和扩散的复杂性已得到广泛认可，因为它受沉积物供应和随时间和空间变化的各种流体动力条件的影响。波浪和水流输送的泥沙是河口和沿海地区主要的泥沙输送机制。但是，尚不清楚每个流体动力因素在多大程度上影响SSC分布。研究风场对SSC扩散范围的定量影响将有助于更好地了解沉积物的运移变化和沉积地貌演化特征。这项研究是从三个Envisat中分辨率成像光谱仪获得的，确定了SSC，它们涵盖了在相同季节和潮汐条件下，但风况不同的情况下，长江口和邻近水域。基于半经验辐射传输模型对SSC进行了检查，该模型已通过观测数据得到了很好的验证。整合来自欧洲中型天气预报中心的相应风场信息，进一步促进了对影响南南合作的风场的讨论，进而促进了长江口和沿海地区水和悬浮泥沙的运输和扩散的影响。结果表明，南海SSC在河口内呈现出更加明显的河流特征，风场是控制浑浊水扩散范围的主要因素之一。 （C）2017 Elsevier Ltd.保留所有权利。

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