DIURNAL TIDE 

 One high water and one low water each 

 tidal day (about 24 hours, 50 minutes) 



SEMIDIURNAL TIDE 

 Two nearly equal high waters and two 

 nearly equal low waters each tidal day 



MIXEDTIDE 



Two unequal high waters and/or two 

 unequal low waters each tidal day 



Corange lines connect 

 points of equal tide 

 range. Numerals Indicate 

 the mean maximum 

 semimonthly spring tide' 

 ranges in feet 



Direction of tide pro- 

 gression 



Figure 1. (a) The study area (South Atlantic Bight) extends from Cape Fear, 

 North Carolina, to Cape Canaveral, Florida, (b) Tidal characteristics of 

 the Atlantic and Gulf of Mexico coasts (adapted from U.S. Geological Survey 

 1970). 



