A monster lurks just off the coast of Northern California. Known as Mavericks, this surf break four miles north of downtown Half Moon Bay generates some of the biggest waves in the world, and draws the big wave surfers that live for them. But what makes these waves so big? QUEST talks with surfers and scientists who are getting to the bottom of it and the big wave surfers willing to take their lives in their hands for the ultimate thrill ride.
MAVERICKS: A STUDY GUIDE FOR EDUCATORS
provided by KQED/Quest
When wind blows over large areas of the ocean, waves are created. How big the waves get are determined by three things: the speed of the wind, the amount of time the wind travels across the ocean and the distance that the wind travels. These waves get their energy from powerful storms formed in the deep ocean. Surfers must understand the science behind these massive waves in order to surf and survive them.
An ocean wave can be described as a disturbance in the water that travels from one location to another. The water is the medium that the wave travels through. Other kinds of waves like sound, radio, visible light, earthquake and stadium travel through other mediums other than water. As a wave moves through water, energy is transferred between the water molecules causing them to move in a circular motion. The peak of the wave is the water at the surface that moves up and forward. As the water moves down and back the ditch of the wave becomes visible. This kind of circular motion is not that visible in the deeper parts of the ocean. As the depth of the water decreases the waves become bigger. When waves traveling a long distance from the far ocean reach the shoreline they usually become much taller and slow down. How far they have traveled and how fast there speed will determine the size of the wave.
The energy that is created by big storms out in the deep sea is transported through the water as a wave. As this energy moves through the water the wave develops a crest and a trough. As each crest of the wave comes one after another it is separated by a trough and this creates the alternating pattern that we can see when looking out into the ocean. As you watch the ocean wave moving through the water you can observe the crests moving along through a given span of time. In order to observe the distance of a wave you must watch the crest. The speed of the wave can then be calculated by dividing the distance traveled by a part of the wave like the crest by given amount of time using the formula speed = distance/time.
For the generation of massive waves, scientists study the underwater topography of the ocean floor. They also use bathymetry, which is the measurement of the depths of oceans and other large bodies of water. They use these data along with satellite technology to monitor and predict when and where these massive waves will hit. Finally, surfers use their knowledge of the physics of these big waves to learn how to catch the ultimate ride.
BEFORE WATCHING THE VIDEO WITH STUDENTS, ASK:
• List all the words that come into your mind when you hear the word “wave.”
• Where do ocean waves come from? What gets them started?
• Toss a penny into a bucket of water then describe how the waves move through the water.
• What do you think a surfer should know about waves before they try and ride a wave while surfing?
• Write down any facts you find interesting while you watch.
• Observe all the waves that you see and describe how they form and break. Use as many words found in the segment for you descriptions.
• Describe how waves are formed, how they originate, and how they are measured?
• What is a maverick wave and what is special about the way it is formed?
• How is energy stored and transferred during wave?
• List any kind of advice given by the surfers about how to survive these “big waves.”
POST-VIEWING ACTIVITIES WITH STUDENTS
• Review students’ answers to the Viewing Focus Questions.
• Explore wave formation by using a slinky. Stretch it out and vibrate the first coil and observe how a wave travels back and forth.
• Debate the challenges that surfers face when they attempt to ride these big waves.
Think about what they need to understand about the physics of big waves to survive.
• Design a poster board presentation of Maverick waves from different parts of the world.
Be sure to describe the geography and the topography of the ocean floor in these areas.
• Create a hallway presentation at your school on the science of surfing. What do surfers need to know about the science of waves to be able to catch the perfect
wave? Be sure to describe how surfers use their knowledge of gravity, momentum, and balance to ride their surf boards.
LESSON PLANS, ACTIVITIES AND READING FOR STUDENTS
Hanging Ten: Surfing the Web, then surfing the waves, The Exploratorium
• Listen to a radio report and find informative articles about everything from the buoyancy of a surfboard to predicting storms.
• An activity designed to be used in conjunction with the NOVA episode of the same name to calculate approximate speeds and travel times for sample tsunamis (video not required for activity).
Introduction to Waves, National Geographic Xpeditions
• A lesson for younger students teaching the components of a wave, wave height and wavelength and using a demonstration about how to make waves, and an activity that allows students to experiment with creating waves of varying sizes.
COAMPS, Coupled Ocean/Atmospheric prediction center
• Have students research real time graphic 3D models of wave and atmospheric predictions using this site. Click on real time forecasts to observe data collected on waves and weather from research stations around the world.
California Academy of Sciences, Wild California
• Read about Tsunamis and how they impact our lives through the online version of the magazine called Wild California. Check out the back issues for other informative articles on what you are presenting in the classroom.
CDIP, The Coastal Data Information Program
• This site analyses data and conducts measurements on coastal environments. Educate yourself further about the science of waves by clicking on “documents” and read about wave generation and the dynamics of wave behavior.
FIELD RESEARCH AND TESTS FOR STUDENTS
Go outside and observe big waves
• Estimate wave height, wave period, and determine wind direction.
• Record differences during different times of the day and during different types of weather
Visit the Bay area Discovery Museum, Sausalito Wave Tank in Toddler Beach exhibit
Bay Area Discovery Museum, Fort Baker
557 McReynolds Road, Sausalito, CA 94965
• Observe wind pushing water into swells and how objects behave while in a water wave.
Find out more about Tides
• What causes high tides and low tides?
• Why are high tides different at different times?
Find out more about big waves around the world
• Identify where these “big waves” occur in other countries and create a worldwide map.
• How does the geography and topography of these areas contributes to the formation of big waves?
How energy is transferred during a wave.
• Find a friend and a jump rope. Stretch the rope between you until it almost touches the ground. Jerk the rope and observe how the snap traveled through rope.
• Mark a spot on the rope with tape and watch how those spots moves when the wave is moving back and forth along the rope.
Creating your own wave pool.
• Fill a long pan with water. Tap the waters surface with a pencil to observe what happens. Describe what you notice about the direction of
• After the water is still put a straw in the center of the water. Disturb the water with a pencil and observe what happens to the straw.
• Drop some food coloring in the water and blow through the straw on the waters surface. What happens to the colored water?
For other educational guides, visit KQED Science/Quest