Journal
OCEAN ENGINEERING
Volume 83, Issue -, Pages 24-35Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2014.03.014
Keywords
Satellite altimetry; Significant wave height; Coastal area; Arabian Sea; Bay of Bengal
Funding
- Council of Scientific & Industrial Research, New Delhi
- Integrated Coastal and Marine Area Management Project by ICMAM, Ministry of Earth Sciences, Chennai
- INCOIS, Ministry of Earth Sciences, Hyderabad
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The applicability of altimeter data for the coastal region is examined by comparing the gridded multi-mission and along-track mono-mission significant wave height (SWH) data with the in situ buoy measurements at four stations off the east and west coasts of India. Among all of the satellites, a greater number of collocated points and better correlation were found for Jason-2. A comparison of the SWH data from multi-mission products (Jason-1, Jason-2, Envisat, and ERS-2) obtained from AVISO with the measured buoy data shows that all of the satellites overestimated the SWH. Applying a correction factor of 0.75, 0.70 and 0.69 to the altimeter data for stations 1, 2 and 4, respectively, resulted in close agreement with the buoy data (correlation coefficient similar to 0.9-0.96). Monthly averaged buoy and altimeter SWH values show convincing correlation ranging from 0.97 to 0.98 for three stations. The smallest correlation coefficient (0.6) was found at station 3, where the selected grid points are located close to the coast and are influenced by land contamination and wave decay effects. For waves with a SWH < 0.5 m, the correlation coefficient is sparingly low for all stations, which underlines the fact that the altimeter observations for SWH < 0.5 m are unreliable. (C) 2014 Elsevier Ltd. All rights reserved.
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