The IEEE Seventh Working Conference on Current Measurement TechnologyCurrent and Wave Monitoring and Emerging TechnologiesMarch 13-15 | Bahia Hotel | San Diego, CA, USA |
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Technical Program Accomodations Order the Proceedings Committee and Contact Info |
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Deep water directional wave measurements from pressure, wave velocities and a three-axis accelerometerHany Elwany1, Ph.D., and Ray Mahr, Jr.2, PE1IOD, Scripps Institution of Oceanography,
La Jolla, California For the past 15 years, directional wave measurements using
a pressure gauge and an electromagnetic current meter mounted on the
shallow ocean bottom (< 20 meters) have been a very successful data
collection method. In the open ocean, directional wave measurements
are typically obtained using a moored surface buoy with a processing
system that measures the translation of either a spherical or discus
buoy in wave field to obtain directional wave spectra. There is now
a need for determination of directional wave characteristics in waters
deeper than 20 meters and in the open ocean. This paper demonstrates
how a subsurface sensor package will utilize information from an electromagnetic
current meter, pressure gauge, and data from a three-axis accelerometer
to estimate the directional wave field. The accelerometer will record
horizontal and vertical movements of the instrument. All the collected
data are used to determine the characteristics of the directional wave
measurements. The instrument will be suspended from a subsurface buoy
at a depth of about 10-20 meters, and the data would be sent either
to an underwater observatory network or sent ashore via an underwater
cable. Such mooring will eliminate the need for a surface mounted device
to estimate directional wave properties, which reduces the risk associated
with sensors deployed on the surface. Submitted on January 22, 2003 |
Sponsored by the Current Measurement Technology Committee (CMTC) of the IEEE Oceanic Engineering Society. All content reserved. Contact jrizoli@whoi.edu for more information. |
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