UNDERWATER CURRENTS OF THE COAST OF SAN DIEGO, CA

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Presentation transcript:

UNDERWATER CURRENTS OF THE COAST OF SAN DIEGO, CA by David Colbert Special thanks to Professor Curtis Collins and the crew of RV New Horizon

OUTLINE Abstract Platform Collection Device Data Collected Description Date Ships Company Collection Device Data Collected Observations Conclusions Questions

ABSTRACT The purpose of this research project is to determine the undersea currents of the San Nicholas Basin southwest of Santa Catalina Island and San Clemente Island. This study was conducted from the RV New Horizon using a hull mounted RDI Broadband ADCP.

RV NEW HORIZON 170-foot oceanographic research vessel owned by UCSD and run by Scripps Institution of Oceanography. For the NPS, Operational Oceanography and Meteorology cruise summer 2009, there were: 12 crew 8 Oceanographer/Meteorologist 8 Students. The ship departed Scripps Pier San Diego, CA 24, July and returned 28, July 2009 All crew, Oceanographers, students, and most Meteorologists returned.

RDI BROADBAND ADCP The ADCP (Acoustic Doppler Current Profiler) uses the Doppler shift to measure current speed and direction. It does this by sending a burst of sound into the water column then measuring the echo of suspended particles carried by the currents as they pass multiple receptor cells. Echoes that are retrieved later are given as deeper recordings. The ADCP Operation: Frequency 75 (kHz) Wavelength 20mm Transducer diameter 280mm Beam width at -3dB 5.0 degrees Avg. Side lobe level 36dB

COLLECTED DATA SST compared to ADCP: ADCP appears slightly behind the SST data. This indicates that the ADCP is off the time sink.

LOCAL SURFACE CURRENTS Circulation Patterns in the Southern California Bight

Average 50-100 m depth currents collected by the onboard ADCP COLLECTED DATA Average 50-100 m depth currents collected by the onboard ADCP Santa Catalina San Nicholas San Diego San Clemente San Nicholas Basin

OBSERVATION Average 50-100 m Currents Predominant Current found in the Basin San Nicholas Basin

CONCLUSION Data collected using the RDI Broadband ADCP, indicates a strong current exists at a depth of 50-100m below the surface in the San Nicholas Basin. Current flows to the north-northwest. Peak flow occurs southwest of San Clemente Island along the northeast side of the San Nicholas Basin, at roughly 40 cm/sec.

QUESTIONS ?