SUN, MOON, AND TIDES — COLBERT 



197 



Figure 7.— Cotidal lines in Chesapeake and Delaware Bays. 



From the theory of the tides, we know that the stationary ocean- 

 wave movement may set up a progressive wave when the effects of 

 this movement are extended to the waters of bays, harbors, and inlets 

 of a coastal area. The progressive wave is prominent in Delaware 

 and Chesapeake Bays and in New York Harbor. 



