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首页> 外文期刊>Estuarine Coastal and Shelf Science >High-frequency turbulence and suspended sediment concentration measurements in the Garonne River tidal bore
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High-frequency turbulence and suspended sediment concentration measurements in the Garonne River tidal bore

机译：Garonne河潮汐口中的高频湍流和悬浮泥沙浓度测量

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The study details new sediment concentration measurements associated with some turbulence characterisation conducted at high-frequency in the undular tidal bore of the Garonne River (France). Acoustic Doppler velocimetry was used, and the suspended sediment concentration was deduced from the acoustic backscatter intensity. The field data set demonstrated some unique flow features of the tidal bore including some large and rapid turbulent velocity fluctuations during and after the bore passage. Some unusually high suspended sediment concentration was observed about 100 s after the tidal bore front lasting for more than 10 min. It is thought that the tidal bore passage scoured the bed and converted upwards the bed material, reaching the free-surface after the bore passage. Behind the tidal bore, the net sediment flux magnitude was 30 times larger than the ebb tide net flux and directed upstream. A striking feature of the data set was the intense mixing and suspended sediment motion during the tidal bore and following flood tide. This feature has been rarely documented.
机译：这项研究详细介绍了新的沉积物浓度测量结果，该测量结果与在法国Garonne河的波浪状潮汐孔中以高频进行的湍流特征相关。使用声学多普勒测速仪，并从声学反向散射强度推导出悬浮的泥沙浓度。现场数据集显示了潮汐孔的一些独特的流动特征，包括在孔通过期间和之后的一些大而快速的湍流速度波动。潮汐孔前持续约10分钟后约100 s，观察到一些异常高的悬浮沉积物浓度。认为潮汐通道冲刷了床层并向上转换了床层材料，在通道通过后到达了自由表面。在潮汐孔的后面，净沉积物通量大小是退潮净通量的30倍，并指向上游。该数据集的显着特征是潮汐期间和洪水之后的剧烈混合和悬浮泥沙运动。很少记录此功能。

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