( ( The ( peak ( wave period ) ) ) ( ( is ( ( estimated ( as ( the ( period corresponding ) ) ) ) ( to ( ( the ( highest peak ) ) ( in ( ( the ( one ( dimensional ( frequency spectrum ) ) ) ) ( of ( the ( wave field ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ peak) (NN wave) (NN period)) (VP (VBZ is) (VP (VBN estimated) (PP (IN as) (NP (DT the) (NN period) (JJ corresponding))) (PP (TO to) (NP (NP (DT the) (JJS highest) (NN peak)) (PP (IN in) (NP (NP (DT the) (CD one) (JJ dimensional) (NN frequency) (NN spectrum)) (PP (IN of) (NP (DT the) (NN wave) (NN field))))))))) (. .)))
The peak wave period is estimated as the period corresponding to the highest peak in the one dimensional frequency spectrum of the wave field.
(ROOT (S (NP (NP (DT The) (NN frequency)) (PP (IN of) (NP (DT a) (NN wave)))) (VP (VBZ is) (NP (NP (DT the) (NN reciprocal)) (PP (IN of) (NP (NP (DT the) (NN period)) (PP (IN of) (NP (DT the) (NN wave))))))) (. .)))