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We experimentally study resonant interactions of oblique surface gravitywaves in a large basin. Our results strongly extend previous experimentalresults performed mainly for perpendicular or collinear wave trains. Wegenerate two oblique waves crossing at an acute angle, while we control theirfrequency ratio, steepnesses and directions. These mother waves mutuallyinteract and give birth to a resonant wave whose properties (growth rate,resonant response curve and phase locking) are fully characterized. All ourexperimental results are found in good quantitative agreement with four-waveinteraction theory with no fitting parameter. Off-resonance experiments arealso reported and the relevant theoretical analysis is conducted and validated.

Observation of resonant interactions among surface gravity waves