Doppler Correction of Wave Frequency Spectra Measured by Underway Vessels

• DOI: 10.1175/jtech-d-16-0138.1
• Publication Date: 2016-12-15T18:46:33Z
• Authors: C. O. Collins; B. Blomquist; O. Persson; B. Lund; W. E. Rogers; J. Thomson; D. Wang; M. Smith; M. Doble; P. Wadhams; A. Kohout; C. Fairall; H. C. Graber
• Keywords: Sea state

Abstract “Sea State and Boundary Layer Physics of the Emerging Arctic Ocean” is an ongoing Departmental Research Initiative sponsored by Office Naval ( http://www.apl.washington.edu/project/project.php?id=arctic_sea_state ). The field component took place in fall 2015 within Beaufort Chukchi Seas involved deployment a number wave instruments, including downward-looking Riegl laser rangefinder mounted on foremast R/V Sikuliaq . Although time series measurements stationary vessel are thought to be accurate, underway introduces Doppler shift observed spectrum. This function wavenumber vector velocity vessel. Of all possible relative angles between direction heading, there two main scenarios: 1) steaming into waves 2) with waves. Previous studies have considered only subset cases, were scenario 1. was likely avoid ambiguities, which arise when study addresses ambiguities analyzes arbitrary cases. In addition, practical method provided that useful situations changing speed or heading. These methods improved estimates spectral shapes peak parameters compared nearby buoys model.