The relative effects of particles and turbulence on acoustic scattering from deep-sea hydrothermal vent plumes.
The relative effects of particles and turbulence on acoustic scattering from deep-sea hydrothermal vent plumes.
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颗粒和湍流对深海热液喷口羽流声散射的相对影响。
DOI：
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发表时间：
2011
影响因子：
2.4
通讯作者：
D. Di Iorio
中科院分区：
文献类型：
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作者：
Guangyu Xu;D. Di Iorio
声学方法用于调查和监测胡安·德富卡海脊奋进段主奋进喷口区内的活跃热液羽流。利用瑞利散射理论计算悬浮颗粒物的前向传播和散射，结果表明，与温度波动引起的湍流（σ（χ）（2）~0.1）相比，悬浮颗粒物的前向传播和散射可以忽略不计（对数振幅方差σ（χ）（2）~10（-7））。然后使用前向散射导出的湍流水平来量化湍流的后向散射，其给出体积后向散射强度s（V）=6.5 × 10（-8）m（-1）。颗粒的体积后向散射截面的范围为s（V）=3.3 × 10（-6）~ 7.2 × 10（-10）m（-1），取决于颗粒的大小。这些结果表明，在热液喷口应用中，前向散射声学方法可用于量化湍流及其对后向散射测量的影响，这可能是一个主要因素，取决于颗粒大小及其在羽流中的位置。
Acoustic methods are applied to the investigation and monitoring of a vigorous hydrothermal plume within the Main Endeavor vent field at the Endeavor segment of the Juan de Fuca Ridge. Forward propagation and scattering from suspended particulates using Rayleigh scattering theory is shown to be negligible (log-amplitude variance σ(χ) (2)~10(-7)) compared to turbulence induced by temperature fluctuations (σ(χ) (2)~0.1). The backscattering from turbulence is then quantified using the forward scattering derived turbulence level, which gives a volume backscattering strength of s(V)=6.5 × 10(-8) m(-1). The volume backscattering cross section from particulates can range from s(V)=3.3 × 10(-6) to 7.2 × 10(-10) m(-1) depending on the particle size. These results show that forward scatter acoustic methods in hydrothermal vent applications can be used to quantify turbulence and its effect on backscatter measurements, which can be a dominant factor depending on the particle size and its location within the plume.