SFSU Underwater Acoustics Research Group

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SFSU Underwater Acoustics Research Group ( references |data |Paper for June 98 ASA Mtg )

Research Projects
Suspended Sediment	Delta Outflow	Boat Wakes	thermal gradient
velocity profiles	modeling with SI3d

"The World Is Our Laboratory"

Acoustic Measurement of Ocean Current and Temperature

Summary:
We have installed an underwater current meter in the delta region of the Sacramento and San Joaquin Rivers in California. This instrument uses cross-correlation of phase-modulated signals to determine sound propagation delays and so to measure the speed of sound in the water. Measurements in two directions permit the determination of the current speed and also provide information on temperature and salinity. Measurements of this type at several points in the interconnecting channels of the Delta will eventually be used by the USGS to determine the net discharge of fresh water into the San Francisco Bay.

Poster Presented to Ocean Sciences Division, American Geophysical Union, February, 1996

See Our Latest Results:

On-line Log book.
Attenuation of Ultrasound by Suspended Sediment

Three-Mile Slough, May 3, 1996: Tests With Stronger Signal

Three-Mile Slough, June 13, 1996: First Results with Waveform Averaging

Tests of USGS Transducers