tailieunhanh - Geography and Oceanography - Chapter 20

Tham khảo tài liệu 'geography and oceanography - chapter 20', khoa học tự nhiên, địa lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Tides Tidal Characteristics single waves - stretch across entire ocean basins. shallow-water waves wavelengths greatly exceed the depth of the ocean. complex interactions of moon and sun Origin of the Tides Unlike wind-driven surface waves and unlike tsunamis, tides are caused by two principal factors: Gravitational attraction Centrifugal force Gravitational Attraction All masses are drawn to each other. The moon because of its closeness to the Earth exerts a greater gravitational effect on the Earth than the Sun, despite the fact that the Sun is much more massive than the Moon. Gravitational Effect of Moon Animation courtesy of NASA Goddard Space Flight Center: The Moon's gravity tugs at the Earth, causing ocean water to slosh back and forth in predictable waves called tides. We can visibly observe some of that energy dissipate at the beach, with waves rolling across coastal shallows and shoals. Most of the energy dissipates due to friction between the water and the shallow floor beneath it Centrifugal Force Earth and Moon revolving around one another. unequal masses of Earth and Moon center of rotation lies beneath the Earth’s surface. second tidal bulge ocean shifts away from center of rotation AWAY from center can be observed in action on a passenger riding in a car. If the car swerves around a corner, the passenger's body pushes against the outer edge of the car Centrifugal Forces: Center of Rotation 2 Bulges from Gravitational Attraction & Centrifugal Force Animation Dynamic Model of the Tides True Tidal Waves (not tsunamis!) The motion of water around the basin is a rotary wave. The crest is at one side of the basin. The trough is at the other side of the basin. Tides have characteristics of both progressive and standing waves. Standing Waves Sea, swell, and surf are progressive waves. Standing waves (seiches) Oscillate back and forth about a node, ., a fixed point. Node = Fixed Point Antinode = maximum displacement Form when winds blow in one . | Tides Tidal Characteristics single waves - stretch across entire ocean basins. shallow-water waves wavelengths greatly exceed the depth of the ocean. complex interactions of moon and sun Origin of the Tides Unlike wind-driven surface waves and unlike tsunamis, tides are caused by two principal factors: Gravitational attraction Centrifugal force Gravitational Attraction All masses are drawn to each other. The moon because of its closeness to the Earth exerts a greater gravitational effect on the Earth than the Sun, despite the fact that the Sun is much more massive than the Moon. Gravitational Effect of Moon Animation courtesy of NASA Goddard Space Flight Center: The Moon's gravity tugs at the Earth, causing ocean water to slosh back and forth in predictable waves called tides. We can visibly observe some of that energy dissipate at the beach, with waves rolling across coastal shallows and shoals. Most of the energy dissipates due to friction between the water and the shallow floor .

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