Accession Number:

ADA160760

Title:

Directional Wave Measurement and Analysis.

Descriptive Note:

Final rept.,

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Personal Author(s):

Report Date:

1985-09-01

Pagination or Media Count:

44.0

Abstract:

A directional wave analysis computer program has been developed to analyze the measured directional wave data from an ENDECO Wave-Track buoy. Due to the nature of the buoy, the direction components must be adjusted in order to apply a conventional wave slope analysis. The choice of a Wave-Track buoy stems from the requirement of a light-weight, easy to handle directional sensing wave buoy. The results can be used to validate the directional spread of wave energy produced by the Spectral Ocean Wave Model SOWM. Also, the resulting directional spread of energy, as produced by the buoy, may now be used with ship motions to produce ship response amplitude operator RAOs, or combined with ship RAOs to estimate ship motions. The equations are developed to account for buoy motions in a current and in shallow water. Although electronic phase shifts have been adjusted, it is still necessary to develop some analytical solution to compensate for hydrodynamic responses and phase shifts. The analyzed results include frequencies, energy densities, Fourier coefficients, first and second harmonic mean wave directions and root mean square rms spreading. Also included is the directional spreading of energy calculated by four different methods. Results have agreed well with other wave measuring buoys as detailed in other sources. Keywords Sea testing. Author

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE