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首页> 外文期刊>Journal of hydro-environment research >Field and theoretical investigation of sediment mass fluxes on an accretional coastal mudflat
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Field and theoretical investigation of sediment mass fluxes on an accretional coastal mudflat

机译：沿海沿海滩涂沉积物质量通量的田野与理论研究。

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Variations in suspended sediment concentrations (SSCs) in tidal mudflats are an important influence on the ecological environment, morphological evolution, and pollutant transport. To better understand how the behavior of suspended sediment influences small-scale variations in SSC in the water column, we took simultaneous measurements of water depth, wave height, current velocity, SSC profiles, and intratidal bed-level changes during a series of continuous tidal cycles on a highly turbid macrotidal mudflat, part of a larger accretional coastal mudflat on the Jiangsu Coast, China. We estimated the relative contributions of erosion, deposition, and advection processes to variations in SSC from the field data. We used an empirical orthogonal function (EOF) analysis to examine the influence of hydrodynamic factors (water depth, wind, wave height, and current velocity) and environmental factors (salinity and temperature) on SSC variability, to determine why the contributions of the three processes (erosion, deposition, and advection) to the variability in SSC differed. Our results showed that on average, advection flux was about an order of magnitude higher than erosion deposition flux of corresponding tide, and that advection, driven by the tidal current velocity, wind, and associated alongshore transport, accounted for most of the variability in SSC at the study site over a complete tidal cycle. An abundant sediment supply and limited resuspension of the bed sediments meant that advection was the main transport process. Our results also demonstrate that detailed analyses of transport processes provide useful information on the sources and fates of suspended sediments, and support the interpretation of morphological changes in accretional intertidal mudflats. (C) 2016 International Association for Hydro-environment Engineering and Research, Asia Pacific Division. Published by Elsevier B.V. All rights reserved.
机译：潮汐滩涂中悬浮沉积物浓度（SSCs）的变化是对生态环境，形态演变和污染物迁移的重要影响。为了更好地了解悬浮沉积物的行为如何影响水柱中SSC的小范围变化，我们在一系列连续的潮汐过程中同时测量了水深，波高，流速，SSC剖面和潮汐内水位变化在高度浑浊的巨潮滩上循环，这是中国江苏沿海较大的沿海增生滩涂的一部分。我们根据现场数据估算了侵蚀，沉积和对流过程对南南合作变化的相对贡献。我们使用经验正交函数（EOF）分析来检查流体力学因素（水深，风，浪高和当前速度）和环境因素（盐度和温度）对SSC变异性的影响，以确定为什么这三个因素的贡献SSC变异性的变化过程（侵蚀，沉积和对流）不同。我们的结果表明，平均而言，对流通量比相应潮汐的侵蚀沉积通量高约一个数量级，并且在潮流，风速和相关的沿岸运输的驱动下，对流是南海地区大部分变化的原因。在一个完整的潮汐周期内在研究地点充足的沉积物供应和有限的床底沉积物再悬浮意味着平流是主要的运输过程。我们的研究结果还表明，对运输过程的详细分析可提供有关悬浮沉积物来源和命运的有用信息，并有助于解释潮间带滩涂增生性滩涂的形态变化。 （C）2016年国际水环境工程与研究协会亚太分会。由Elsevier B.V.发布。保留所有权利。

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