Accession Number:

ADA090342

Title:

A Modified JONSWAP Spectrum Dependent Only On Wave Height and Period.

Descriptive Note:

Final rept.,

Corporate Author:

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

Personal Author(s):

• Lee,Wah T.
• Bales,Susan L.

Report Date:

1980-05-01

Pagination or Media Count:

31.0

Abstract:

For simplicity as well as consistency with the current state-of-the-art in seakeeping performance assessment, a wave spectral formulation for fetch-limited ocean areas which is dependent only on the significant wave height and modal wave period is desirable. A modified version of the JONSWAP spectrum is therefore derived, but as is the case with the usual fetch-dependent JONSWAP spectrum, it contains too much energy for fetches above about 40 nautical miles. This inconsistency is probably due to certain parameter relationships which are all based on least squares fits. Therefore, a new parameter, Beta is developed to replace the usual Alpha parameter, correcting for the parameters nonuniversality. Author

Descriptors:

• *WATER WAVES
• *SEAKEEPING
• COMPUTER PROGRAMS
• COMPUTERIZED SIMULATION
• FREQUENCY
• STATE OF THE ART
• GROWTH(GENERAL)
• ONE DIMENSIONAL
• GRAPHS
• SHALLOW WATER
• SPECTRA
• LEAST SQUARES METHOD
• TABLES(DATA)
• ATTENUATION
• WIND VELOCITY

Subject Categories:

• Physical and Dynamic Oceanography
• Marine Engineering
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE