Harris

Hi all, Does anyone know whether CGWAVE can output the wave spectrum at a an output point? or, alternatively, is it possible to modify the time step and length of the output time series? I want to use a white noise spectrum as input, say in the band from 20Hz to 200Hz, in order to determine the resonance frequencies of a harbour. If the first component of input spectrum is the T=20sec component, the time interval of the output time series is 1sec and the duration 20sec. If the longest duration component (T=200sec) is first, the time interval is 10sec and the duration 200sec. It appears that th

Hi, I am trying to model the wave agitation within a harbour basin caused by infra-gravity (IG) waves. These long period (20 - 200sec) waves are formed under the windsea wave groups and are bound to them, hence, their propagation characteristics (celerity and direction)are those of the wave group. Moreover, their "shoaling" characteristics differ from the free gravity waves. The IG waves are released and can propagate as free gravity waves when the wave group formation ceases to exist, either due to depth induced breaking along the breaker zone or due to diffraction at the harbour entrance. He

I tried to create the IG wave spectrum based on a windsea standard directional spectrum defined in SMS, utilizing the IG Wave Toolbox of CGWAVE under SMS 9.2. However, the wave energy of the generated IG spectrum seems to be too high. The input windsea spectrum is a TMA spectrum characterized by Hs=3.0m and Tp=7.0sec (gamma=3.3 and nn=4) with 30 frequency and 30 directional components. The correponding *.spf file was created at the IG Wave Toolbox by selecting the above spectrum. The followind data were entered in the IG Wave Toolbox: Offshore water depth: 50m