© 2011 Pearson Education, Inc. CHAPTER 8 Waves and Water Dynamics.
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Transcript of © 2011 Pearson Education, Inc. CHAPTER 8 Waves and Water Dynamics.
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© 2011 Pearson Education, Inc.
CHAPTER 8 Waves and Water Dynamics
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Chapter Overview
• Most waves are wind-driven.
• Most waves are generated by storms.
• Waves transmit energy across the ocean surface.
• Tsunami are special fast, long waves generated by seismic events.
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© 2011 Pearson Education, Inc.
Wave Generation
• Disturbing force causes waves to form• Wind blowing across ocean surface• Interface of fluids with different densities
• Air – ocean interface–Ocean waves
• Air – air interface –Atmospheric waves
• Water – water interface –Internal waves
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Types of Waves
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Internal Waves
• Associated with pycnocline
• Larger than surface waves
• Caused by tides, turbidity currents, winds, ships
• Possible hazard for submarines
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© 2011 Pearson Education, Inc.
Other Types of Waves
• Splash wave– Coastal landslides, calving icebergs
• Seismic sea wave or tsunami– Sea floor movement
• Tides– Gravitational attraction among Moon, Sun,
and Earth• Wake
– Ships
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Energy in Ocean Waves
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Wave Movement
• Waves transmit energy • Cyclic motion of particles in ocean
– Particles may move• Up and down• Back and forth• Around and around
• Particles in ocean waves move in orbital paths
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Progressive Waves • Progressive waves oscillate uniformly and
progress without breaking– Longitudinal – Transverse– Orbital
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Orbital Waves
• Waves on ocean surface• Anatomy
– Crest– Trough– Wave height (H)– Wavelength (L)
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Orbital Waves
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Orbital Wave Characteristics
• Wave steepness = H/L– If wave steepness > 1/7, wave
breaks• Wave period (T) = time for one
wavelength to pass fixed point• Wave frequency = inverse of
period or 1/T
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Orbital Wave Characteristics
• Diameter of orbital motion decreases with depth of water
• Wave base = ½ L• Hardly any motion
below wave base due to wave activity
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Circular Orbital Motion
• Wave particles move in a circle
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Deep-Water Waves
• Water depth is greater than wave base (>½L)• Wave speed = celerity (C)• C = L/T
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Speed of Deep Water Waves
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Transitional Waves • Characteristics of both deep- and shallow-water waves
• Celerity depends on both water depth and wavelength
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Shallow-Water Waves • Water depth is < ½0L• C (meters/sec) = 3.13 √ d(meters) or • C (feet/sec) = 5.67 √d (feet)• Where d is water depth
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Wind-Generated Wave Development
• Capillary waves– Wind generates stress
on sea surface
• Gravity waves– Increasing wave energy
• Trochoidal waveforms– Increased energy, pointed crests
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Sea and Swell
• Sea or sea area – where wind-driven waves are generated
• Swell – uniform, symmetrical waves originating from sea area
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Factors Affecting Wave Energy
• Wind speed
• Wind duration
• Fetch – distance over which wind blows
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Wave Height
• Directly related to wave energy
• Wave heights usually less than 2 meters (6.6 feet)
• Breakers called whitecaps form when wave reaches critical steepness
• Beaufort Wind Scale describes appearance of sea surface
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Global Wave Heights
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Beaufort Wind Scale
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Maximum Wave Height
• USS Ramapo (1933): 152-meters (500 feet) long ship caught in Pacific typhoon
• Waves 34 meters (112 feet) high
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Wave Energy
• Fully developed sea– Maximum wave height, wavelength for
particular fetch, speed, and duration of winds at equilibrium conditions
• Swell– Uniform, symmetrical waves that travel
outward from storm area– Long crests– Transport energy long distances
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Swells
• Longer wavelength waves travel faster and outdistance other waves– Wave train – a group of waves with similar
characteristics– Wave dispersion – sorting of waves by
wavelengths
• Wave train speed is ½ speed of individual wave
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Wave Train Movement
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Wave Interference Patterns
• Collision of two or more wave systems• Constructive interference
– In-phase wave trains with about the same wavelengths
• Destructive interference– Out-of-phase wave trains with about the same
wavelengths
• Mixed interference– Two swells with different wavelengths and
different wave heights
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Wave Interference Patterns
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Waves in Surf Zone
• Surf zone – zone of breaking waves near shore
• Shoaling water – water becoming gradually more shallow
• When deep water waves encounter shoaling water less than ½ their wavelength, they become transitional waves.
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Waves Approaching Shore
• As a deep-water wave becomes a shallow-water wave:– Wave speed decreases– Wavelength decreases– Wave height increases– Wave steepness (height/wavelength)
increases
– When steepness > 1/7, wave breaks
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Waves Approaching Shore
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Breakers in Surf Zone
• Surf as swell from distant storms– Waves break close to shore– Uniform breakers
• Surf generated by local winds– Choppy, high energy, unstable water
• Water depth < ½0 wavelength, waves act as shallow-water waves– Wave particles “feel” sea floor
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Three Types of Breakers
• Spilling
• Plunging
• Surging
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Spilling Breakers
• Gently sloping sea floor
• Wave energy expended over longer distance
• Water slides down front slope of wave
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Plunging Breakers
• Moderately steep sea floor
• Wave energy expended over shorter distance
• Best for board surfers• Curling wave crest
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Surging Breakers
• Steepest sea floor• Energy spread over
shortest distance• Best for body surfing• Waves break on the
shore
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Surfing
• Like riding a gravity-operated water sled
• Balance of gravity and buoyancy
• Skilled surfers position board on wave front– Can achieve speeds up to 40 km/hour
(25 miles/hour)
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Wave Refraction
• Waves rarely approach shore at a perfect 90 degree angle.
• As waves approach shore, they bend so wave crests are nearly parallel to shore.
• Wave speed is proportional to the depth of water (shallow-water wave).
• Different segments of the wave crest travel at different speeds.
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Wave Refraction
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Wave Refraction• Wave energy unevenly
distributed on shore• Orthogonal lines or
wave rays – drawn perpendicular to wave crests– More energy released
on headlands– Energy more dissipated
in bays
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Wave Refraction
• Gradually erodes headlands
• Sediment accumulates in bays
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Wave Reflection• Waves and wave
energy bounced back from barrier
• Reflected wave can interfere with next incoming wave
• With constructive interference, can create dangerous plunging breakers
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Standing Waves• Two waves with same wavelength moving in
opposite directions• Water particles move vertically and horizontally• Water sloshes back and forth
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Tsunami
• Seismic sea waves
• Originate from sudden sea floor topography changes– Earthquakes – most common cause– Underwater landslides– Underwater volcano collapse– Underwater volcanic eruption– Meteorite impact – splash waves
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Tsunami Characteristics
• Long wavelengths (> 200 km or 125 miles)
• Behaves as a shallow-water wave– Encompasses entire water column,
regardless of ocean depth– Can pass undetected under boats in open
ocean
• Speed proportional to water depth– Very fast in open ocean
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Tsunami
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Tsunami Destruction• Sea level can rise up to 40 meters (131 feet)
when a tsunami reaches shore.
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Tsunami
• Most occur in Pacific Ocean – More earthquakes and
volcanic eruptions
• Damaging to coastal areas
• Loss of human lives
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Historical Tsunami• Krakatau – 1883
– Indonesian volcanic eruption
• Scotch Cap, Alaska/Hilo, Hawaii – 1946 – Magnitude 7.3 earthquake in Aleutian Trench
• Papua New Guinea – 1998– Pacific Ring of Fire magnitude 7.1 earthquake
• Indian Ocean – 2004– Magnitude 9.3 earthquake off coast of
Sumatra
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Historical LargeTsunami
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Tsunami Warning System• Pacific Tsunami
Warning Center (PTWC) – Honolulu, HI– Uses seismic wave
recordings to forecast tsunami
• Deep Ocean Assessment and Reporting of Tsunami (DART) – System of buoys– Detects pulse of tsunami
passing
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Tsunami Watches and Warnings
• Tsunami Watch – issued when potential for tsunami exists
• Tsunami Warning – unusual wave activity verified – Evacuate people– Move ships from
harbors
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Waves as Source of Energy
• Lots of energy associated with waves
• Mostly with large storm waves– How to protect power plants– How to produce power consistently
• Environmental issues– Building power plants close to shore– Interfering with life and sediment movement
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Wave Power Plant
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Wave Power Plants
• First commercial wave power plant began operating in 2000
• LIMPET 500 (Land Installed Marine Powered Energy Transformer)– Coast of Scotland– 500 kilowatts of power under peak operating
capacity
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Wave Farms
• Portugal – 2008– Ocean Power Delivery– First wave farm
• About 50 wave power development projects globally
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Global Wave Energy Resources
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End of CHAPTER 8
Waves and Water Dynamics