['Regardless', 'of', 'the', 'details', ',', 'the', 'forced', 'response', 'is', 'composed', 'of', 'shallow', '-', 'water', 'waves', ',', 'possibly', 'including', 'Kelvin', 'waves', ',', 'with', 'the', 'largest', 'amplitudes', 'in', 'waves', 'with', 'a', 'natural', 'frequency', 'ωf', 'close', 'to', 'that', 'of', 'the', 'forcing', 'frequency', 'ω', ';', 'various', 'examples', 'of', 'this', 'sort', 'are', 'given', 'in', 'Chapters', '9', 'and', '10', 'of', 'Gill', '[', '16', ']', '.']