Bottom boundary layer in south San Francisco Bay, California
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Abstract
Detailed velocity distributions within the benthic turbulent boundary layer were measured by a Broad Band Acoustic Doppler Current Profiler (BB-ADCP) in South San Francisco Bay, California. In "mode 5", the BB-ADCP was able to measure velocity in 5 cm increments. The validation of these measurements was achieved by comparing the BB-ADCP measurements with the velocities measured by a Narrow Band Acoustic Doppler Current Profiler (NB-ADCP) in close proximity. There were thirty-three (33) velocity time-series measured by the BB-ADCP beginning at 7 cm above bed and extending to 175 cm in water column for about two weeks. The velocities from locations at 7 cm and 12 cm above the bed were determined to be of lower accuracy, and they were not used in estimates of friction velocity, u.. The values of u. at 95% confidence level were determined with relative error less than 20%. The time-series of u. varied with velocity outside of the boundary layer, and responded to spring-neap tidal variations. Attempts to use acoustic backscatterance echo intensity to measure suspended sediment concentration showed prom ise, and merit consideration in future studies.
Suggested Citation
Cheng, R.T., Gartner, J.W., Smith, R.E., 1997, Bottom boundary layer in south San Francisco Bay, California: Journal of Coastal Research, v. Special Issue 25, p. 49-62.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Bottom boundary layer in south San Francisco Bay, California |
| Series title | Journal of Coastal Research |
| Volume | Special Issue 25 |
| Year Published | 1997 |
| Language | English |
| Publisher | Coastal Education & Research Foundation, Inc. |
| Contributing office(s) | San Francisco Bay-Delta, Pacific Regional Director's Office |
| Description | 14 p. |
| First page | 49 |
| Last page | 62 |
| Conference Title | International Biennial Conference on Physics of Estuaries and Coastal Seas |
| Country | United States |
| State | California |
| Other Geospatial | San Francisco Bay |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |