•- 20 



«» 10 



f/fp 



Figure 12. Dimensionless near spectra for several high wave, 

 short -period groups at Nags Head, Mortli. Carolina. 



(a) 



JW\j\)f\f\rJ\^^ 



— ^IOJ|«— 



Hj/d =0.35 



If, =190cm Op =2.1 Hj=a78 (J/gTp' = O.OI2 

 Tf=iBi d :5.4m (i,:i8 d/Lp =0.119 



„ 50.000 



(b) 



UVvAaJAa/aJUW 



HIOj}— 



H,/d =0.36 

 Hjs205c™ Op:t.5 qj=I^3 d/«Tp'=O.OIJ 

 l^z&St d = S.7n 44=4.7 4/Lp = O.I22 



Figure 13. Two pen-and-ink strip-chart records and corresponding spectra from 

 Nags Head, North Carolina, (a) Record at 0800 e.s.t., 20 April 1969; 

 analysis at 0642 e.s.t., 20 April 1969; (b) record at 2000 e.s.t., 

 1 March 1969; analysis at 2040 e.s.t., 1 March 1969. ■*' 



35 



