Acoustic Fluctuations Due to Shallow Water Thermal Microstructure
Naval Postgraduate School, 1974 - Underwater acoustics - 310 pages
Simultaneous measurements of waves, orthogonal water particle velocities, temperature, conductivity and acoustic phase and amplitude measurements at 20 and 40 kHz over horizontal and vertical, 2m paths were made at the Navel Underwater Center oceanographic tower, San Diego in April 1974. Four stochastic models for acoustic propagation including geometric, Born, Rytov and Debye approximation models were tested. Taylor thermal microscales from spatial correlation analyses determined vertically across the thermocline varied from 6.8 to 178 cm. Temporal stochastic analyses showed horizontal acoustic path losses were ten times vertical losses because of diffraction effects.
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EXPERIMENT AND DATA ANALYSIS
4 other sections not shown
band-pass filter Bathythermograph Traces Born approximation Born model calculated Calibration CD CD Channels Compared coherence Correlation and Structure Correlation Function Structure Debye models Department of Oceanography Ensemble Equation Eulerian integral scale experiment FREQUENCY HZ Function Structure Function geometrical optics gradient hydrophone internal wave layer low-pass filtered measurements Model Experimental Results Model Tests Naval Postgraduate School Obhukov ocean Oceanography OJ OJ particle velocities Postgraduate School Monterey record REGRESSION PLOT rH rH Run 1 Run Rytov and Debye Rytov's method SAM1 SAM3 sec 56 sec signal Skudrzyk sonar sonar array sound amplitude sound path sound phase sound pressure level SPH1 stationarity Structure Function Lag Structure Function Thermistor surface wave surface wave frequencies TABLE Taylor microscale Temperature Spatial Scales TEMPORAL STOCHASTIC thermocline TMH2 turbulence intensity turbulent blobs UNITS INCH URRIRNCE FIT Values for Model variance Vertical Spatial Correlation vertical thermistor array wave region