水圧式波浪計の補正係数nの周波数スペクトルについて

Abstract

It is well known that the correction factor "n" must be inevitably used in estimating a fre-quency spectrum of surface wave pattern from a record of pressure-type wave gauge. Therefore, frequency spectrum of this factor, which has not been understood well, is studied by analysingsome simultaneous observation records of capasitance-type and pressure-type wave gauges atthe Shirahama Oceanographic Tower Station in Tanabe Bay. Values of this factor "n" obtainedfrom the cross spectrum analysis are 1.13 at 0.1 c/s, 1.39 at 0.3 c/s, and 1.60 at 0.5 c/s and agreewell with Seiwell's and Folsom's observed results. Corrected power spectra obtained from under-water pressure records at the Tower Station using our present correction factor "n" show an equi-librium range of wind wave spectrum characterized byf-5 law.