A STUDY ON ESTIMATION METHOD OF SIGNIFICANT WAVE PERIOD AND SIGNIFICANT WAVE HEIGHT OF DOUBLE-PEAKED SPECTRAL WAVES

Abstract

 In recent years, damages to port and harbour structures caused by swells have been reported. A double-peaked spectrum is observed when wind waves and swells from a remote source coexist. Its importance was suggested in the revised technical standards for port and harbour facilities. The statistical properties of double-peaked spectrum waves on the upright section of composite breakwaters under the action of those waves were investigated by the experiments in wave flume. The design wave periods for calculating the forces are also discussed on the basis of experimental results of Tanimoto et al.(1986). They showed that the wave force can be calculated if the significant wave period of the double-peaked spectrum wave is obtained directly by individual wave analysis. This study examined the calculation method of the significant wave period TS and the significant wave height H_s of double-peaked spectrum waves. This study compared TS and HS calculated by three existing formulas for the double-peaked spectrum wave, and the applicability was examined. In addition, we proposed a modification coefficient of Tanimoto et al.'s formula for a significant wave period and confirmed accuracy improvement.