Evaporation Duct Modeling and Electromagnetic Wave Propagation
Summary
Evaporation ducts arise in the marine atmospheric boundary layer when moisture evaporating from the sea surface produces a refractive‐index inversion that traps electromagnetic waves close to the surface. Such ducts can extend from a few to tens of metres above the sea, profoundly influencing radar performance, ship‐to‐shore communications and over‐the‐horizon surveillance. Modelling approaches range from empirical formulations based on meteorological gradients to physics‐based refractivity profiles and full‐wave numerical solvers. Traditional models, such as the Paulus‐Jeske and Naval Postgraduate School schemes, use measured temperature, humidity and wind data to estimate duct height and strength. More recent efforts integrate ray‐tracing algorithms and parabolic‐equation methods to simulate propagation loss and multipath effects under varying sea states. Machine‐learning techniques are now being applied to forecast duct characteristics in real time, enhancing operational adaptability. A thorough understanding of evaporation‐duct dynamics is crucial for optimising maritime radar coverage, reducing false targets and improving wireless link reliability in naval and coastal applications.
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Evaporation Duct Modeling and Electromagnetic Wave Propagation publication trend
The graph below shows the total number of articles in evaporation duct modeling and electromagnetic wave propagation across all publications each year (not limited to Nature Index journals).
Technical terms
Evaporation duct: A stable refractive layer over the ocean surface caused by humidity inversion that guides electromagnetic waves.
Evaporation duct height (EDH): The vertical extent of the ducting layer, critical for predicting propagation paths.
Modified refractivity: A measure of atmospheric refractive index adjusted for curvature of the Earth, used in duct modelling.
Over-the-horizon detection: Radar capability to detect targets beyond the normal line of sight by exploiting ducting phenomena.
Ray tracing: A computational method tracing the path of electromagnetic rays through refractive media to predict propagation loss and coverage.
References
- Application of the PJ and NPS evaporation duct models over the South China Sea (SCS) in winter. PLOS ONE (2017).
- Evaporation Duct Height Nowcasting in China’s Yellow Sea Based on Deep Learning. Remote Sensing (2021).
- Experimental Analysis of Atmospheric Ducts and Navigation Radar Over-the-Horizon Detection. Remote Sensing (2022).
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