Two environment components are described in the following articles, namely:
'Wave Component' - which is used to specify various parameters that define a wave or sea-state. The component may be used to define either regular waves (Regular Airy, Stokes V or Dean’s steam function) or a random sea (Pierson-Moskowitz, JONSWAP, Ochi-Hubble, Torsethaugen and User-Spectrum wave spectra). Waves can be specified in various combinations of deterministic waves and random seas. For random seas, two wave spectrum discretisation options are provided, one based on discretising the spectrum into equal-area segments, and the other based on a geometric progression of component harmonics.
'Current Component' - which is used to define a current profile. Three types of current profile can be specified, namely Uniform, Piecewise Linear and Power Law. For uniform current profiles, the current velocity and direction are constant throughout the water depth. For piecewise linear current profiles, the current velocity and direction vary in a piecewise linear manner throughout the water depth. For power law current profiles, the current velocity varies according to a 1/7th power law profile, and the current direction is constant throughout the water depth. For all types of current, PipeLay plots the current distribution as part of the Current component’s component view.