. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 54 TIDAL. CURRENTS TYPICAL TIDE CURVES FOR UNITED STATES PORTS 12 13 14 15 16 17 19 19 20. Luni' dltj mil S 9th ipogw 10!h lilt qulrtti I3ttv on fouilo' !6ln rww moon 20th panftt 22d mil N dtcnnttion 23d FIG! RE 1. Predicted tides at selected ports along the I S. east coast and in the Gulf of Mexico. The range and character of tides differ significantly along coasts and between distinct regions. From the I .S. Department of Commerce Tide
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 54 TIDAL. CURRENTS TYPICAL TIDE CURVES FOR UNITED STATES PORTS 12 13 14 15 16 17 19 19 20. Luni' dltj mil S 9th ipogw 10!h lilt qulrtti I3ttv on fouilo' !6ln rww moon 20th panftt 22d mil N dtcnnttion 23d FIG! RE 1. Predicted tides at selected ports along the I S. east coast and in the Gulf of Mexico. The range and character of tides differ significantly along coasts and between distinct regions. From the I .S. Department of Commerce Tide Tables (1974). reflected back out to sea by the shoaling bottom which rises toward the beach. The combination of the in- coming, or incident, wave and the reflected wave is called a standing tide; the semidaily tide on the conti- nental shelf between Cape Hatteras and Long Island is an example of a standing tide. The wave may also propagate along the coast, in which case it is called a progressive tide; that is, the stages of the tide progress down the coastline. An example of a progressive tide is the daily tide along the cast coast. Both of these examples can be seen in Figs. 2 and 3. The technical term for a tide that is generated elsewhere and propa- gates into a given region is cooscillation. The water on the continental shelf off the east coast cooscillates with the North Atlantic. Coastal lagoons, bays, and estuaries cooscillate with the water on the continental shelves. The tides often enter these coastal bodies of water through inlets and over bars, both of which can significantly attenuate the tides so that the tides inside the embayment are smaller than the tides along the open coast. EQUATIONS OF MOTION To compute the tides and tidal currents within a region having a complicated shape and realistic bathymetry, computer programs have been developed which use information at a number of points to compute the motion at those or other points. How well the resul
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