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Nombre: THEORETICAL ANALYSIS OF AVERAGE WAVE STEEPNESS RIELATED TO PEAK PERIOD OR TO MEAN PERIOD

Idioma: English

Palabras claves: MATHEMATICAL-ANALYSIS; RANDOM NOISE; HINDCAST

Autores: Arena F (Arena, Felice)1, Soares CG (Soares, Carlos Guedes), Petrova P (Petrova, Petya)

Abstract: The average wave steepness may be defined as the ratio between the significant wave height H-s and the wavelength associated to either the zero-up-crossing mean period L-m or the peak period L-p (Bitner Gregersen et al., 1998). This parameter may be calculated from wave data at fixed locations, as well as by starting from theoretical spectra. In this paper the average wave steepness is firstly analyzed by considering a JONSWAP spectrum. It is shown that for this spectrum the ratio s(m) = Hs/Lm, as well as s(p)=H-s/L-p, depends upon the values of the spectrum parameters. The theoretical values are then compared with wave data in the Mediterranean Sea, Pacific Ocean, Atlantic Ocean and North Sea. The values of s(m) and s(p) are deeply investigated for severe sea states, with large values of H-s. It is obtained that in severe sea state the observed values of wave steepness, defined as either s(m) or s(p), are always in the range defined by theoretical spectra; therefore, the extreme values of s(m) and s(p), which are of interest for naval architecture, may be obtained from theoretical analysis, as a function of extreme values of H.

Empresa: Univ Reggio Calabria, Dept Mech & Mat Mediterranea

Año: 2010

Fuente: 29th ASME International Conference on Ocean, Offshore and Arctic EngineeringShanghai, PEOPLES R CHINA, JUN 06-11, 2010

Info contacto / e-mail: arena@unirc.it, guedess@mar.ist.utl.pt, ppetrova@mar.ist.utl.pt