Tidally induced turbulence and suspended sediment
Tidally induced turbulence and suspended sediment
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DOI：
10.1029/2004gl021186
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发表时间：
2004-10
影响因子：
5.2
通讯作者：
A. Souza;L. G. Alvarez;T. Dickey
中科院分区：
文献类型：
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作者：
A. Souza;L. G. Alvarez;T. Dickey
使用新颖方法收集的近乎连续的数据可用于增进对强潮汐流条件下的湍流和悬浮颗粒物 (SPM) 动力学的理解。关键仪器包括单个声学电流剖面仪，可提供近乎连续、并发的湍流和有关海底附近和水柱内深度的 SPM 信息。观测结果显示，底部和底部上方 12 米 (mab) 之间的湍流产生存在约 1 小时的滞后，而 SPM 则存在约 1.5 小时的滞后。涡流粘度的估计值显示在 10−3 和 10−2 m2 s−1 之间，在底部 7 米内，平均值几乎恒定为 3.5 × 10−3 m2 s−1。当使用范围在 3.5 × 10−3（平均值）和 10−2（最大值）之间的涡流粘度值时，当前的观察结果和先前报告的理论显示 SPM 和湍流的振幅和相位具有良好的一致性。我们的数据集对于评估、开发和改进湍流和 SPM 数值模型非常有价值。
Nearly continuous data collected using novel methods are utilized to advance the understanding of turbulence and suspended particulate matter (SPM) dynamics under strong tidal flow conditions. Key instrumentation includes a single acoustic current profiler that provides nearly continuous, concurrent turbulence and SPM information with respect to depth near the seafloor and within the water column. Observations show a lag of about 1 hour in turbulence production between the bottom and 12 meters above the bottom (mab), and of about 1.5 hours for SPM. Estimates of eddy viscosity show values ranging between 10−3 and 10−2 m2 s−1, with an almost constant mean value of 3.5 × 10−3 m2 s−1 within the bottom 7 meters. The present observations and a previously reported theory show good agreement in both amplitude and phase for SPM and turbulence, when values of eddy viscosity ranging between 3.5 × 10−3 (mean) and 10−2 (maximum) are used. Our data set is valuable for evaluating, developing, and improving turbulence and SPM numerical models.