14 15 16 17 



Figure 7. Typical tide curves for U.S. west 

 coast ports . 



mostly mixed. Figure S shows low-passed (tide-removed 

 daily) values at Atlantic City, New Jersey, for a full year. 

 The large variations in a day or a few days are due to wind 

 set-up along the wide continental shelf. The variations, 

 much larger in winter than summer, indicate why the continuum 

 peaks at low frequencies. 



A principal objective in tidal research is the prepara- 

 tion of accurate cotidal and co-range charts. These charts, 



26-14 



