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首页> 外文期刊>Estuarine Coastal and Shelf Science >A traversing system to measure bottom boundary layer hydraulic properties
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A traversing system to measure bottom boundary layer hydraulic properties

机译：用于测量底部边界层水力特性的横动系统

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摘要

This study describes a new convenient and robust system developed to measure benthic boundary layer properties, with emphasis placed on the determination of bed shear stress and roughness height distribution within estuarine systems by using velocity measurements. This system consisted of a remotely operated motorised traverser that allowed a single ADV to collect data between 0 and 1 m above the bed. As a case study, we applied the proposed traversing system to investigate bottom boundary layer (BBL) hydraulic properties within Coombabah Creek, Queensland, Australia. Four commonly-employed techniques: (1) Log-Profile (LP); (2) Reynolds stress (RS); (3) Turbulent Kinetic Energy (TKE); and (4) Inertial Dissipation (ID) used to estimate bed shear stresses from velocity measurements were compared. Bed shear stresses estimated with these four methods agreed reasonably well; of these, the LP method was found to be most useful and reliable. Additionally, the LP method permits the calculation of roughness height, which the other three methods do not. An average value of bed shear stress of 0.46 N/m~2, roughness height of 4.3 mm, and drag coefficient of 0.0054 were observed within Coombabah Creek. Results are consistent with that reported for several other silty bed estuaries.
机译：这项研究描述了一种开发来测量底栖边界层特性的新的方便且坚固的系统，重点是通过使用速度测量来确定河口系统内的床切应力和粗糙度高度分布。该系统由一个遥控电动平移机组成，该平移机允许单个ADV收集床上方0到1 m之间的数据。作为案例研究，我们使用提出的遍历系统来调查澳大利亚昆士兰州库姆巴巴溪内的底部边界层（BBL）水力特性。四种常用技术：（1）日志配置文件（LP）； （2）雷诺应力（RS）； （3）湍动能（TKE）； （4）比较了通过速度测量估算床层剪切应力的惯性耗散（ID）。用这四种方法估算的床层剪应力相当吻合。其中，LP方法被认为是最有用和最可靠的。另外，LP方法允许计算粗糙度高度，而其他三种方法则不允许。在Coombabah Creek内观测到的床层剪应力平均值为0.46 N / m〜2，粗糙度高度为4.3 mm，阻力系数为0.0054。结果与其他几个粉质床河口的报道一致。

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