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Chapter 11 Tides

Tide Patterns - regular, cyclic patterns of low water-high water. Tide - rhythmic oscillation of the ocean surface due to gravitational

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Chapter 11 Tides

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    22. Tidal Patterns Center on Amphidromic Points The development of amphidromic circulation (a) A tide wave crest enters an ocean basin in the Northern Hemisphere. The wave trends to the right because of the Coriolis effect (b), causing a high tide on the basins eastern shore. Unable to continue turning to the right because of the interference of the shore, the crest moves northward, following the shoreline (c) and causing a high tide on the basins northern shore. The wave continues its progress around the basin in a counterclockwise direction (d), forming a high tide on the western shore and completing the circuit. The point around which the crest moves is an amphidromic point (AP).

    23. Tidal Patterns Vary with Ocean Basin Shape and Size How do tides behave in confined basins? The tidal range is determined by basin configuration. (a) An imaginary amphidromic system in a broad, shallow basin. The numbers indicate the hourly positions of tide crests as a cycle progresses. (b) The amphidromic system for the Gulf of St. Lawrence between New Brunswick and Newfoundland, southeastern Canada. Dashed lines show the tide heights when the tide crest is passing.

    24. Tidal Patterns Vary with Ocean Basin Shape and Size Tides in a narrow basin. (a) True amphidromic systems do not develop in narrow basins because there is no space for rotation. (b) Tides in the Bay of Fundy, Nova Scotia, are extreme because water in the bay naturally resonates (seiches) at the same frequency as the lunar tide.

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