Darrell Jackson
Appl. Phys. Lab., Univ. of Washington, 1013 NE 40th St., Seattle, WA 98195
L. D. Wright
Virginia Inst. of Marine Sci., College of William and Mary, Gloucester Point, VA 23062-1346
In Spring 1993, oceanographic and acoustic apparatus were deployed in Eckernfoerde Bay, Baltic Sea. An instrumented tetrapod recorded physical data, revealing turbidity events associated with resonant internal waves. Acoustic bottom backscattering data at 40 kHz were acquired simultaneously and show features that correlate with the turbidity events. Such a correlation is surprising as estimates of shear velocity suggest that bottom stress never reached the critical magnitude necessary to resuspend sediment; rather the turbidity events appear to involve advection from a distant location. Correlations are evident in comparisons of acoustically derived time series for change in temperature and change in echo character with time series from current meters, optical backscattering sensors, and thermistors. [Work supported by the NRL CBBL Special Research Program.]