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We report on experiments of perfect absorption for surface gravity wavesimpinging a wall structured by a subwavelength resonator. By tuning thegeometry of the resonator, a balance is achieved between the radiation dampingand the intrinsic viscous damping, resulting in perfect absorption by criticalcoupling. Besides, it is shown that the resistance of the resonator, hence theintrinsic damping, can be controlled by the wave amplitude, which provides away for perfect absorption tuned by nonlinear mechanisms. The perfect absorberthat we propose, without moving parts or added material, is simple, robust andit presents a deeply subwavelength ratio wavelength/size $\simeq 18$.

Perfect absorption of water waves by linear or nonlinear critical coupling