Performance of a wave energy device in shallow-water nonlinear waves : part I

As wave energy devices continue to be installed in shallow-water regions with high power densities, it seems important to predict their performance using shallow-water, nonlinear wave theory. In this paper, the behavior of a shallow-water, two-dimensional, single-mode device in nondispersive, fully nonlinear waves is studied. An analytical solution for the wave profile and device velocity is obtained via the hodograph transformation. These quantities are then used to compute the efficiency of the device. The incident wave is assumed to be a long wave which has steepened into a bore at the device. Nonlinearity notwithstanding, the results indicate an optimum damping level at which the device efficiency may be maximized.

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