Wave measurement intercomparison and platform evaluation during the ITOP (2010) experiment

Clarence O. Collins, Björn Lund, Rafael J. Ramos, William M. Drennan, Hans C. Graber

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Spectral wave parameters from 11 platforms, measured during the recent Impact of Typhoons on theOcean in the Pacific (ITOP) experiment, are intercompared. Two moorings, separated by;180 km, were deployed in a section of "typhoon alley"off the coast of Taiwan for 4 months. Each mooring consisted of an Air-Sea Interaction Spar (ASIS) buoy thatwas tethered to amoored ExtremeAir-Sea Interaction (EASI) buoy. EASI, the design ofwhich is based on the hull of a 6-mNavyOceanographicMeteorologicalAutomaticDevice (NOMAD) buoy, is validated as a 1D wave sensor against the established ASIS. Also, during this time three drifting miniature wave buoys, a wave-measuringmarine radar on theResearch Vessel RogerRevelle, and several overpasses of Jason-1 (CandKubands) andJason-2 (Ku band) satellite altimeterswerewithin 100kmof either the northern or southern mooring site. These additionalmeasurements were compared against both EASI buoys. Findings are in-line with previous wave parameter intercomparisons. A corroborated measurement of mean wave direction and direction at the peak of the spectrum from the EASI buoy is presented. Consequently, this study is the first published account of directional wave information that has been successfully gathered from a buoy with a 6-m NOMAD-type hull. This result may be applied to improve operational coverage of wave direction. A high level of confidence is established in the ITOP wave data. Advantages and disadvantages of the different sensor types are discussed, which may be useful for the design of future field experiments.

Original languageEnglish (US)
Pages (from-to)2309-2329
Number of pages21
JournalJournal of Atmospheric and Oceanic Technology
Issue number10
StatePublished - 2014

ASJC Scopus subject areas

  • Ocean Engineering
  • Atmospheric Science


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