. Coastal currents along the Atlantic coast of the United States. Ocean currents; Tides. TIDAL CURRENTS O RELATION OF TIME OF CURRENT TO TIME OF TIDE In simple wave motioii the times of slack and strength of current bear a constant and simple relation to the times of high and low waters. In a progressive wave the time of slack water comes, theo- retically, exactly midway between high and low water and the time of strength at high and low water; in a stationary wave slack comes at the times of high and low water, while the strength of current comes midway between high and low water. The progres
. Coastal currents along the Atlantic coast of the United States. Ocean currents; Tides. TIDAL CURRENTS O RELATION OF TIME OF CURRENT TO TIME OF TIDE In simple wave motioii the times of slack and strength of current bear a constant and simple relation to the times of high and low waters. In a progressive wave the time of slack water comes, theo- retically, exactly midway between high and low water and the time of strength at high and low water; in a stationary wave slack comes at the times of high and low water, while the strength of current comes midway between high and low water. The progressive-wave movement and the stationary-wave move- ment are the two principal types of tidal movements. A progressive Knots. FiGTJBE 3.—Curves of daily and mixed types of reversing currents. wave is one whose crest advances, so that in any body of water that sustains this type of tidal movement the times of high and low water progress from one end to the other. A stationary wave is one that oscillates about an axis, high water occurring over the whole area on one side of this axis at the same instant that low water occurs over the whole area on the other side of the axis. The tidal movements of coastal waters are rarely of simple wave form; nevertheless, it is very convenient in the study of currents to refer the times of current to the times of tide. And where the diurnal inequality in the tide is small, as is the case on the Atlantic coast, the relation between the time of current and the time of tide is very nearly constant. This is brought out in figure 4, which represents 429061°—42 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Haight, Frank Joshua, 1893-; U. S. Coast and Geodetic Survey. Washington [D. C. ] : U. S. Govt. Print. Off.
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Keywords: ., book, bookcentury1900, booksubjectoceancurrents, booksubjecttides
