Interesting facts about waves
- 21 December 2017 | Surfing
Waves are a mysterious phenomenon that surrounds us more than we imagine. Here are a few things you probably didn't know about waves.
Waves appear in many forms and shapes. They have their own properties and behave differently from each other.
From a scientific perspective, waves can be categorized based on the direction of movement (longitudinal waves, transverse waves and surface waves) or based on the (in)ability to transmit energy (electromagnetic waves and mechanical waves).
Waves are everywhere: they are a part of our daily lives, in and out of the water. Sound is a type of wave that travels through the air.
Waves, or more precisely microwaves, can also help cook your food. A microwave is a form of radiation with wavelengths ranging from one meter to one millimeter.
Waves do not transport matter - they transport energy. And that's what why surfers can ride ocean ripples.
The largest wave ever recorded by humans measured 1,720 feet. It was triggered by an earthquake that hit Alaska's Lituya Bay, on July 9, 1958. In fact, two occupants of a small fishing boat that was in the area surfed that wave and survived to tell the story.
Most waves we see coming in from the horizon are a product of wind that blows over large areas of the ocean. Length, height, period and speed are the main characteristics of a typical sea wave.
There are four main types of breaking waves: spilling waves, plunging waves, collapsing waves, and surging waves.
A wave breaks when it enters shallow waters, and the bottom of the wave slows down. The moment the wave reaches a depth that is 1.3 times the wave height, the top part of the wave collapses.
Overall wave heights in the Northern Hemisphere vary more throughout the year than they do in the Southern Hemisphere. As a result, surfers get small waves during summer and powerful groundswells in winter.
A seiche is a standing or stationary waves that sway back and forth in a closed or partially constrained body of water - a lake, a swimming pool, and harbor or a billabong. Here's how it behaves:
In deep water, a floating object traces an orbital path as a wave passes through, ending up in the more or less same place. In shallow water, that same object will move slightly forward in a motion called "Stokes drift."
In the Southern Hemisphere, there is less difference in wave height between the warm and cold seasons, resulting in more consistent surfing conditions throughout the year.
The Agulhas Current, off the coast of Durban, in South African, produces some of the biggest waves in the world. In this busy shipping area, waves can easily reach heights of over 100 feet (30 meters).
The typical length of tsunami waves is about 100 times the depth. As a result, the travel speed of travel of a wave in the ocean with an average depth of approximately 13,200 feet (4,000 meters) is of around 440 miles per hour (700 kilometers per hour), which means the speed of a jet plane.
The idea of turning wave energy into electricity took place in 1799 when Girard & Son patented a mechanism to drive wave power to activate pumps, mills, saws and heavy machinery.
In theory, the wave energy potential of the United States is estimated to be of 2.64 trillion kWh, which means around 65 percent of all the electricity in the country in 2016. The world's first wave power farm was installed in Portugal.