. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 60 TIDAL CURRENTS. COT10E UNES 40° 33° 30° 70° FIGURE 7. Theoretical corange chart jor the M: semidaily tide off the L'.S. east coast. Ranges are in feet. From Redfield (1958). Fig. 6; the corange and cotidal charts are given in Figs. 7 and 8. In regions where bottom stress can be neglected, the motion is determined approximately by the following equations: du -fo = ~g dt bv dt dr, dt ^1 dx + /« = ~g dr, dy = -h /du dv\ \dx+ dy) (10) (ID (12) The se
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 60 TIDAL CURRENTS. COT10E UNES 40° 33° 30° 70° FIGURE 7. Theoretical corange chart jor the M: semidaily tide off the L'.S. east coast. Ranges are in feet. From Redfield (1958). Fig. 6; the corange and cotidal charts are given in Figs. 7 and 8. In regions where bottom stress can be neglected, the motion is determined approximately by the following equations: du -fo = ~g dt bv dt dr, dt ^1 dx + /« = ~g dr, dy = -h /du dv\ \dx+ dy) (10) (ID (12) The second terms, —fv and +/«, in (10) and (11) represent effects of the earth's rotation. There are two ways in which the Coriolis effect can alter tides and tidal current. In the case of a Poincare wave, the water parcel trajectories are ellipses whose major (larger) axis is in the direction of propagation; the ratio of the major to minor axis is the inertial period Te divided by the period T of the tidal con- stituent. This type of tide can occur only where Te > T and is generally found in exposed regions such as conti- nental shelves. The semidaily tide in the Middle Atlantic Bight (Fig. 7) is a standing Poincare wave (Redfield, 1958). In restricted cmbayments such as the North Sea (Fig. 4) or on continental shelves where the direction of propagation of the tide is parallel to the coastline, a slope in the sea surface set up against the shore can balance the Coriolis effect. The result is a Kelvin wave. For a coastline parallel to the x direction and located aty = 0, a Kelvin wave has the form (13) (14) (15) H> ~ 7)] v = 0 208. 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 Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Sc
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