Analysis of Velocity Measurements at NOTS Pier on San Clemente Island

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Abstract:

This report describes oceanographic observations at NOTS Pier on San Clemente Island, CA. Velocity measurements were made to assess the suitability of NOTS Pier for testing ocean turbulence sensors. Measurements at NOTS Pier on San Clemente Island off the coast of Southern California show that the water velocities there consist of tidal currents and oscillations caused by surface waves. Tidal currents are parallel to the shoreline with frequencies that are mixed diurnal and semidiurnal with an rms amplitude of approximately 8 cms. Ocean swells 10- to 12-s period and wind waves 3- to 5-s period induce periodic horizontal and vertical velocities with rms amplitudes of 5 cms and 1 cms, respectively, under quiet conditions. Direct measurement of small-scale velocities with high-frequency current meters indicates that the velocity field under the pier is consistent with anisotropic turbulence. Using a model of frozen field turbulence in an oscillating mean flow, estimates of the turbulent dissipation rate are Ew 1.1 x 10expn -5m2s3 based on the horizontal velocity spectrum and Ew 1.1 x 10expn -6m2s3 for the vertical.

Author(s):
Hendricks, Peter J.
Author Organization(s):
NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
Descriptive Note:
Technical rept.
Supplementary Note:
NUWC2015
Pagination:
0037

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NUWC-NPT-TR-11116
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_6.3_Net Management; JCA_6.1.1_Wired Transmission; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_5.3_Planning; JCA_5_Command and Control; JCA_6.1_Information Transport; JCA_4.1_Deployment and Distribution; JCA_4.6.1_General Engineering; JCA_4.6_Engineering; JCA_8_Building Partnerships
Modernization Areas:
Autonomy
Communities of Interest:
Weapons Technologies
Descriptor(s):
*ACOUSTIC MEASUREMENT, *ACOUSTIC VELOCITY, *SURFACE WAVES, ACOUSTIC DETECTORS, ANTISUBMARINE WARFARE, DOPPLER SYSTEMS, OCEAN ENVIRONMENTS, PIERS, PRESSURE, SPECTRA, TIDAL CURRENTS, TURBULENCE, VELOCIMETERS
Field(s)/Group(s):
Physical and Dynamic Oceanography, Acoustic Detection and Detectors, Acoustics
Keyword(s):
ACOUSTIC DOPPLER CURRENT PROFILERS, NONACOUSTIC ANTISUBMARINE WARFARE, ADV(ACOUSTIC DOPPLER VELOCIMETERS), OCEAN TURBULENCE SENSORS, MAVS(MODULAR ACOUSTIC VELOCITY SENSORS), SOUND VELOCITY MEASUREMENTS, BOTTOM PRESSURE, TURBULENT VELOCITIES, NOTS(NAVAL ORDNANCE TEST STATION), NOTS PIER
Report Date:
1999 Apr 30
Creation Date:
2016 Oct 26