Review of Recent Developments in Evaporation Ducting Assessment
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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Continued interest in accurately assessing and exploiting evaporation ducting effects has resulted in some recent work summarized in this paper. Available evaporation duct height and path loss models are compared. This includes both sensitivities of duct height values to meteorological inputs and agreements between different path loss models. The models compared are those developed by Jeske, Hitney, and Rotheram. Reasonable agreement of duct height calculations and path loss values derived from the different models was obtained when applied to statistically averaged meteorological inputs. Commonly used point measurements were found inadequate for reliable evaporation duct assessment. This led to the suggestion of a new shipboard deployable sensor using a single temperature sensor for air-sea temperature measurements. Both long time statistical duct height averages and individual data sets often contain unusually high duct heights not supported by propagation measurements.
- Radiofrequency Wave Propagation