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The influence of directional spreading of waves is significant for wave-induced loads, wave breaking and nonlinearity of the waves. For physical model testing performed at test facilities such as the Ocean and Coastal Engineering Laboratory at Aalborg University, it is crucial to validate if the test conditions match the target sea states by measur...
Contexts in source publication
Context 1
... present method is developed for wave characterisation in laboratory facilities, wherefore the frequency span is limited to 0.15 Hz -3 Hz, which is a typical range of generation in physical model testing. The present work uses surface elevations from a standard CERC5 wave gauge array as seen in Figure 4, as it is a commonly applied wave gauge array for wave analysis of multidirectional waves, as the internal directions between the gauges are widely spread. The size of the array is adjusted to each sea state, such that the diameter, D array = 2R, is 0.15 times the wavelength of the peak frequency (L p ). ...
Context 2
... example of the results of the analyses appears in Figure 5, where a segment of the time series of the surface elevation in position of WG1, cf. Figure 4, for sea state 1, cf. Table 1, with 30% reflection is shown. ...
Context 3
... distances between the gauges in the present array depend on the direction of propagation of the specific component, the number of gauge separations that fulfill this requirement will therefore vary with frequency, due to the wavelength, as well as the direction of propagation. The number of valid gauge separations for the CERC5 array given in Figure 4 is illustrated in Figure 7, where the array is scaled to sea state 1, such that the diameter D = 0.15L p , where L p is the wavelength of the peak frequency, which is the same sea state as the previous results. Another way to determine if the gauge array is useful and an accurate solution to the linear system of equations exists, is based on the condition number as suggested by de Ridder et al. (2023). ...
