η (*t*) ' j *A*n ∆*f*

4

2

2

0

1 2 2

2

(II-1-143)

2

εn ' tan&1

(e) By induction, an estimate of the continued energy spectrum of *η(t) *may be obtained by

2

j η(*n*∆*t*) *e*

1

2 π *i f *(*n *∆*t*)

(II-1-144)

∆*t*

where *T*r is the *record length *and *∆t *is the *sampling interval*.

II-1-82

Water Wave Mechanics

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