Spatial coherence length and wave structure function for plane waves transmitted in anisotropic turbulent oceans.
Summary
This study analyzes light propagation in seawater turbulence. Salinity fluctuations significantly impact wave phase structure and coherence length more than temperature, with both showing saturation tendencies.
Area of Science:
- Ocean optics
- Fluid dynamics
- Wave propagation
Background:
- Turbulence in seawater significantly affects light propagation.
- Spatial coherence length and wave phase structure function are key parameters for describing these effects.
- Understanding these parameters is crucial for underwater communication and sensing.
Purpose of the Study:
- To derive the wave phase structure function and spatial coherence length for plane waves in moderate to strong seawater turbulence.
- To analyze the influence of various factors on these parameters, including turbulence strength, signal wavelength, and propagation distance.
- To investigate the distinct effects of temperature and salinity fluctuations on light propagation.
Main Methods:
- Development of a modified seawater turbulence power spectrum.
- Application of an oceanic-modified Rytov approximation.
- Numerical calculations to analyze parameter evolutions.
Main Results:
- Both phase structure function and spatial coherence length increase with propagation distance and decrease with turbulence strength, exhibiting saturation.
- Seawater salinity fluctuations have a more pronounced effect than temperature fluctuations.
- Wave structure function decreases with increasing signal wavelength and anisotropy, while spatial coherence length shows an inverse trend.
Conclusions:
- Salinity is a dominant factor influencing light propagation in seawater turbulence.
- The derived models provide insights into the behavior of light in turbulent oceanic environments.
- Findings are relevant for optimizing underwater optical systems.
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