Measuring Turbulent Dissipation Using a Tethered ADCP
Measuring Turbulent Dissipation Using a Tethered ADCP
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DOI：
10.1175/jtech-d-13-00198.1
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发表时间：
2014-08
影响因子：
2.2
通讯作者：
N. Lucas;J. Simpson;T. Rippeth;C. Old
中科院分区：
文献类型：
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作者：
N. Lucas;J. Simpson;T. Rippeth;C. Old
AbstractThe结构函数法估计耗散率的湍流动能，以前验证的测量从海底固定支架，适用于数据从1.2 MHz的声学多普勒海流剖面仪（ADCP）仪器操作在脉冲-脉冲相干模式和安装在中层水以下的系留浮标。浮标的运动引入了额外的相对速度分量，但假设这些流动分量不应严重干扰湍流信息，因为（i）水平或垂直平移在ADCP波束的所有单元中引起相同的流动分量，以及（ii）仪器绕其中心的任何旋转引起垂直于波束方向的流动分量，因此也不影响结构功能。这一假设是通过比较一系列的耗散测量从系泊ADCP与那些从自由落体垂直微结构剖面仪（VMP）剪切探头部署从附近的研究船。那个...
AbstractThe structure function method for estimating the dissipation rate of turbulent kinetic energy, previously validated for measurements from seabed fixed mounts, is applied to data from 1.2-MHz acoustic Doppler current profiler (ADCP) instruments operating in pulse–pulse coherent mode and mounted in midwater below a tethered buoy. Movements of the buoy introduce additional relative velocity components, but it is hypothesized that these flow components should not seriously interfere with the turbulence information because (i) horizontal or vertical translation induces the same flow component in all cells of an ADCP beam and (ii) any rotation of the instrument about its center induces flow components that are normal to the beam direction, and thus neither affect the structure function. This hypothesis is tested by comparing a series of dissipation measurements from a moored ADCP with those from a free-falling Vertical Microstructure Profiler (VMP) shear probe deployed from a nearby research vessel. The...