Abstract
The NOAA/Environmental Technology Laboratory (ETL) conducted the ‘‘Coastal Ocean Probe Experiment’’ (COPE) in the Oregon coastal area (with water depth of 150 m) in September, 1995. Strong internal soliton activities have been observed. The isotherm records measured by FLIP demonstrate that the maximum amplitude of isotherm depression can reach ∼30 m. Based on these internal soliton data, numerical simulation on acoustic propagation through solitons has been conducted. Some interesting features of the acoustic field are found: (1) The internal solitons can cause significant mode coupling, but there is no abnormal transmission loss (TL) appearing in the frequency range 50–1000 Hz. (2) Mode coupling strongly depends on frequency, mode number, and the direction of propagation. (3) The modal horizontal refraction (MHR) caused by the internal solitons is significant and offers additional useful information for acoustic monitoring of the internal soliton activities. [Work supported by NOAA.]
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