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Inter-comparison of wave measurement by accelerometer and GPS wave buoy in shallow water off Cuddalore, east coast of India

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Title Inter-comparison of wave measurement by accelerometer and GPS wave buoy in shallow water off Cuddalore, east coast of India
 
Creator Patra, Sisir Kumar
Jena, B K
 
Subject Accelerometer and GPS buoy
Significant wave height
Wave direction
 
Description 45-49
The performances of Accelerometer and GPS
buoy were tested off Cuddalore at 30 m water depth during 15 to 30 November
2010 by mooring the buoys 225 m apart from each other. Compared to other wave
parameters, results of regression analysis on significant wave heights (Hs)
shows a better correlation (correlation coefficient R = 0.94) between accelerometer
and GPS buoy. A lesser coefficient of R = 0.85 and 0.77 were resulted for wave
direction and peak wave period (Tp) respectively. Waves were
basically approaching from two directions, i.e. two wave forms or wave fields.
One wave field was from around 80° and other was 140°. However, the wave
directions averaged within each field over the

observation period individually are in
good agreement with both buoys. It was noticed that the predominant directions reported
by these buoys were not identical always. Even though the buoys were placed at
identical water depths (~ 30 m) and in close proximity (~ 225 m), they were
reporting different predominant directions. The correlation seems low because
it was determined to a large extent, with waves from different directions.
Comparatively, zero up-crossing wave period (Tz) shows a better
agreement with Tp, which may not be a robust parameter due to its
dependence on estimation of spectral peak.
 
Date 2014-02-05T09:26:03Z
2014-02-05T09:26:03Z
2014-01
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/26424
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(1) [January 2014]