DocumentCode :
306654
Title :
Near bottom velocity measurements in San Francisco Bay, California
Author :
Gartner, Jeffrey W. ; Cheng, Ralph T.
Author_Institution :
US Geol. Survey, Menlo Park, CA, USA
Volume :
1
fYear :
1996
fDate :
23-26 Sep 1996
Firstpage :
457
Abstract :
The ability to accurately measure long-term time-series of tidal currents in bays and estuaries is critical in estuarine hydrodynamic studies. Accurate measurements of tidal currents near the air-water interface and in the bottom boundary layer remain difficult in spite of the significant advances in technology for measuring tidal currents which have been achieved in recent years. One of the objectives of this study is to demonstrate that turbulent mean velocity distribution within the bottom boundary layer can be determined accurately by using a broad-band acoustic Doppler current profiler (BB-ADCP). A suite of instruments, including two BB-ADCPs and four electromagnetic (EM) current meters was deployed in San Francisco Bay, California in an investigation of resuspension and transport of sediment during March 1995. The velocity measurements obtained in the bottom boundary layer by BB-ADCP were highly coherent (r2>0.94) with the velocity measurements obtained by EM current meters. During early March 1995, both BB-ADCPs and EM current meters recorded a very unusual flow event. Agreement among independent measurements by these instruments in describing such an atypical hydrodynamic occurrence further validates the velocity measurements obtained by BB-ADCP in the bottom boundary layer
Keywords :
acoustic applications; oceanographic regions; oceanographic techniques; AD 1995 03; ADCP; California; EM current meter; North Pacific; San Francisco Bay; USA; United States; bay; bottom boundary layer; broad-band acoustic Doppler current profiler; coast; current; electromagnetic current meter; measurement technique; near bottom velocity; ocean dynamics; tidal current; turbulence; turbulent mean velocity distribution; Acoustic measurements; Current measurement; Geologic measurements; Geology; Hydrodynamics; Instruments; Sea measurements; Sediments; Storage area networks; Velocity measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
OCEANS '96. MTS/IEEE. Prospects for the 21st Century. Conference Proceedings
Conference_Location :
Fort Lauderdale, FL
Print_ISBN :
0-7803-3519-8
Type :
conf
DOI :
10.1109/OCEANS.1996.572802
Filename :
572802
Link To Document :
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