Introduction - Naval Postgraduate School

Introduction - Naval Postgraduate School

by David Colbert Special thanks to Professor Curtis Collins and the crew of RV New Horizon OUTLINE Abstract Platform 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. 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 degrees 5.0

Avg. Side lobe level 36dB SST compared to ADCP: ADCP appears slightly behind the SST data. This indicates that the ADCP is off the time sink. Circulation Patterns in the Southern California Bight

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

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

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 ?

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