Growth waves. Oceans are in constant motion waves pocket the surface of the water but ways are not equally high almost up at the equator they tend to be more shallow as high a letter to use theyre stronger. A wave can traverse entire oceans but its not actually the water itself that is moving with the wave confusing lets head to the shore and find out about waves and where they come from. The Atlantic Coast of portugal and spain for its waves large and small purser 1st of all novels of ability and as an enthusiastic wave rider hes also a physics teacher so he knows something about how waves form and what surfers find really epic a perfectly shaped long way surfing with fire. Practice and patience of all this stuff and its often just luck and have to be in the right place at the right time there are so many factors the height of the tide the when the wave period that play a role and sometimes theres just a tiny window maybe half an hour a day when you get good way and the rest is rubbish you know. This looks like a good moment. The surfing Science Teacher sees is the opportunity. But what are and ways exactly. Waves are the transfer of energy. Transfer and energy. So far todays waves have been pretty tame lets do an experiment on the beach and i ask a question since town we can see how the wave is being propagated through the length of the cloth his shaking is providing the energy thats being transferred. But what does a wave in a towel have in common with a wave in the ocean. More than you might think. Whether its a towel wave or a water wave bit of the waves transport energy not matter. Even though that might not be obvious that seen from the beach the water is just the transport medium. Just like the surfer is waiting on their boards the molecules in the water dont move over great distances at the wave propagates much faster 0 as the energy in waves come from it. It depends on what kind of points were talking about. The moon this Gravitational Force keeps the ocean in motion. Its attraction produces the rising and falling sea levels known as and flow. But the waves the. Interest servers are generated by the wind what matters is how strongly and how long it loads it gets the water particles moving. Heres the simulation the hairdryer makes the wind which makes waves. Wainscot travel for days and hundreds of kilometers from their place of origin in the middle of the ocean to the coast. Long and shallow waves tend to travel faster than the short highly ones which slow themselves down. Within the waves the water particles follow circular or orbital paths. That this Orbital Movement extends deep down in the water the deeper the water the smaller the radius of the circular motion but when to circle in the water particles hit the seabed theyre stopped and then. That an egg shell or water waves. Breakers are typical Shallow Water waves. They occur when the water particles below the surface are slowed at the bottom of the particles above continue to move on their circular patterns unhindered. Unchecked water particles move upward making the wave tower up at the shore and then break. To the delight of the surfers. The op looking at it makes you happy its very exhausting by night time not totally knocked out but happy if you get all the everyday stress its just great. But the best brakes dont come on demand which is why this evening until yes he is still in the water waiting for that perfect wave. But waves can also be scary in the past sail is reported towering waves that suddenly arose out of nowhere on the open ocean but scientists dismissed these accounts until the mid 990 s. That is when a socalled rope weight was documented on an oil rig in the north sea. This freak late measure 25 metres in height. Now researchers are trying to understand and recreate these monsters. In the ocean waves that are between 8 and 10 meters high are commonplace but at any given time anywhere in the world there are likely to be 10 also rogue waves up to 30 metres in height. They appear suddenly and without warning. Scientists recreate rogue waves here in the wave basin up and concious institute in hanover here the water isnt whipped up by storms or currents the waves are generated by these panels which are controlled by a computer. They enable the scientists to simulate nearly every kind of wave at a scale of 1. 00 to 75. 00 everything from small harmless ocean swells to gigantic monster waves the way for me to shows the current heights of the way. Music output is going to simulate the drought in a way the 1st rug wave ever documented is was measured on always drop an oil rig in 1905 i did not say we can see it clearly in this north sea story it shows 8 to 10 meter high waves on average during the storm and then here we see a mixed. Remove that a wave thats 25 meters high a rogue wave months of it. Whats unique about rogue waves is that theyre 2. 00 to 3. 00 times higher than the highest waves around them. And that also makes them 2. 00 to 3. 00 times as steep. A rogue wave has almost 10 times as much force as a normal way. For a long time it was a mystery how a wave more than 20 metres high could suddenly arise in a storm of 8 metre high waves but only 2 famished shortly thereafter. The explanation waves dont spread out equally in the water waves with shorter wavelengths in which the troughs and crests quickly follow each other only move relatively slowly. Weights with a long way lengths are faster. They can catch up with shorter ones. When that happens they can combine to create a high a wave. If several waves join together in this way they can become a rogue wave. Rogue waves are extremely steep the ship has no chance of sailing over the crest of a rogue wave as it can with an ordinary one instead the water crashes over it. The water masses collide with the structures on deck with tremendous force in a real scenario at sea this would break the ships windows and bend heavy steel elements. Scientists can simulate monster waves in a laboratory but what they really want to know is under what conditions and how often such waves will occur in nature. What is the likelihood of a freak wave forming. Previous estimates had suggested that the probability of finding a way higher than 10 meters in a heavy storm would only be 0. 03 percent. But measurements show that giant waves occur much more frequently the actual chance of waves forming that are at least 10 meters high is closer to one percent. And thats the classical approach of heres to the theory that every wave has a Certain Energy that the energy of one wave can sometimes overlay that of another to form a particularly high wave and that the component waves each with their own energy can thereafter continue on their way for. Newer approaches theorize that energy can also be transferred from one wave to another and that this 2nd wave moves on with somewhat more energy and the 1st one was somewhat less it has been you can. Surf the waves would take on energy from their neighbors and grow at their expense into rogue waves that can endanger even big ships at sea. This is not a rogue wave but its a nami tsunamis are not generated by wind at the surface but on the sea bed usually by earthquakes when tectonic plates colline releasing massive amounts of energy and displacing huge volumes of water. Far at it seats anomalies are still relatively small waves traveling fast. But when they reach the shore they slow and the water piles up into towering waves dozens of meters high which can destroy everything in their path. Waves arent only powerful theyre also pretty loud. They can get up to 100 decibels thats as noisy as a jackhammer 10 meters away. And. The sound is generated when the waves break but despite the volume the sound of waves is generally perceived as relaxing. Waves break on the shore it day and night and have been doing so for millions of years. Nobody seems to mind the noise in fact most really enjoy the sound why is that. If anyone knows the answer then scientists at the frown who for institute for building physics based in stuttgart germany. This is our echo chamber will use it to test absorbers. Pitter punched out and his colleagues research how people experience the sounds that surround them in the field is called psychoacoustics they also develop products. Here theyre working on a booth with sound absorbing properties where one can conduct private conversations without being overheard. This chamber is anechoic that is totally soundproof its used to test things but its not actually pleasant to spend time man. This is to lecture its perhaps rather too quiet were not built to hear nothing at all. We cant close our ears in contrast to our eyes how is our original vigilance systems warning us of dangers seen our hearing is always switch dongs designed to receive signals and issue warnings to protect us from harm seeking to nieman for good fallen to violent super fast and. This kind of sound is better than silence if we want to relax. I just like. That has to do with the structure of waves. Its not a uniform constant noise with the same volume but rather it rises and recedes regularly its. Like the surging is a very relaxing kind of sound for us since very familiar and with positive associations. Prostitution us it sets your own and white pink and brown noise are characterized by equal intensity at different frequencies the sound of waves exemplifies that when you give voice to. The sounds of produced as water slaps on to water and displaces at went out without movement there would be no noise machine or new vehicle kind toward. People like certain kinds of sound with or without the ocean waves technically generated white noise is sometimes even deployed in workplaces it can disguise other sounds. And it can be soothing. Ocean and seek to make this kind of noise doesnt carry information so after a while our brains infer that they dont need to do anything until in the noise out all register its. Liminal e when feud even did so thats why it feels relaxing. By listening its not real silence there is something that says but its not threatening is take its not telling us anything so we can just relax your attitude as you in synch by 2. Waves might still primal anxiety and let us sleep easy but one of the ocean is far away. Is highway noise and effective substitute. Is one for been trafficked noise isnt all that different when the vehicles are just passing by at a constant speed and not starting and stopping on distortion so young the sound is continuous over time and have a constant volume because the cars are driving at around the same speed the fog so i get on with a farm. So in a sense listening to a highway should be a good law by except our brains link the sounds to the cause of them and the associations are anything but mellow traffic speed concentration stress i believe the sound of waves by contrast feels friendly reminds us of the cation or allows our minds to simply go blank. We asked on facebook what do you think of when you hear the sound of waves. Mirer from venezuela loves the sound of waves and says nothing is more relaxing than the sea and its waves. Every writes from indonesia that the sea is amazing almost alive its always rippling sometimes slowly sometimes strongly and sometimes its terrifying. For pius the sound of waves is very familiar. He wrote to us and shes so heavey that hes a skilled swimmer and thats what he knows. And the other from indonesia is more interested in ocean waves as a source of energy and says we might be able to use them to replace fossil fuels and thats true. There have been many attempts to use the forces in the ocean waves to generate electricity weve been successful with other forces of nature solar power for example is most advanced in china india and japan according to the International Renewable energy agency. Other countries are focusing on wind energy here to china is in 1st place but its proven very difficult to harness the energy of waves. Immensely powerful forces. Huge wind generated waves. Of the tides controlled by the moons gravity. With an area of 360000000 square kilometers about 70 percent of the earths surface is covered by water. Most of it is in the ocean which could be a mouth of force of Climate Friendly energy but how can we harness that power tidal amplitude very dramatically around the globe in parts of western europe they are particularly pronounced. The 1st tide mills were built in the middle ages or even earlier they were driven by the daily changes in water levels. In the 1960 s. This idea was picked up again and engineers built the 1st big tidal power station in question the in front. Turbines inside the tidal garage are driven by the admin flow of the ocean. But the engineers and county to prop. Im only few bases are suitable for this type of power plant and the barrages also disrupt the coastal ecosystem. But that didnt stop them they saw other ways of using Marine Energy this time focusing on the strength of waves. Wind generation surface waves tend to be large and strong as high latitudes of the northern and southern hemispheres. In scotland in the 1970 s. Scientists developed a series of new mechanisms intended to convert the energy of surface waves into electricity many believe that way then a g. Converters were on the verge of a breakthrough. And one such device was called the salters duck named after its inventor Stephen Salter from edinburgh. The duck was tested waves but never on the open sea. Eventually these ideas fell by the wayside. In the early 2000 came a new attempt with this snake like offshore device its link cylindrical sections flex and bend in the waves and convert the motion into electricity but it never got past the prototype stage. German engineers are currently testing another system the ne most project involves flotation modules connected to pulleys on the seabed by flexible cables as theyre pulled by the motion of the waves a generator transforms the mechanical energy into electricity its being tested as an addition to offshore wind farms. So far most of the approaches to topping marine power have got nowhere one reason the formidable technical hurdles. Wave heights change continually constant the force of the waves to stand up to the biggest waves the machinery has to be very robust but this equipment produces too little energy. When waves are gentler there are many different ways of harnessing wave power but theyre all still too expensive to be viable. And want to thailand. Developers shifted to anchoring the turbines on the sea floor rather than in barrages but underwater repairs are expensive. Plus i plot forms have turbines mounted underneath that are more accessible and thus easier to fix when the corrosive salt water damages the machines. Although the energy of the wild and salty seas has repeatedly proved difficult to harness many engineers remain optimistic that a breakthrough is just around the corner. If our old one is right why our great laugh even if you hate. It. Now its time for our viewer question this week it comes from morocco i took a look at the ways in the ocean and asked where the water is really transparent. The water in this class looks transparent. The ocean looks blue book both water so why the difference. To understand that we need to delve into physics color is an effect of light and without like everything turns black. The light from the song made the white but its actually a mixture of a range of wavelengths some of them are invisible to the human eye like ultraviolet rays other parts of the spectrum of visible to us and we see them as red orange yellow green blue or violet. That mixed together we perceive the light as white. So why do. Different things have different colors. Because they absorb different parts of the light spectrum the rest is reflected and picked up by the receptors in the eye. The material the jacket is made of absorbs blue green and yellow light red like to be reflected so the jacket looks red. So whats going on with water. Close to the shore where the water is shallow the light mostly passes through without being absorbed or reflected. By the light rays fall on a larger body of water the red orange yellow components of the light are absorbed more strongly on the new light as preferentially reflected. So thats why the ocean looks blue its not because it reflects the sky. Divers can observe the effect of absorption as they descend into the depths 1st the red light disappears then the green and then the yellow what remains is blue light that hasnt been absorbed by the water further down that too is absorbed you get to a point where no visible light at all has penetrated. So the color of the water seems to have depends on the quantity of it large volumes of water no clue. But a small amount of water appears transparent. You know the science question then just ask youll find us at d w dot com slash science and on twitter and facebook. Heres a fun fact waves have a strong effect on animals and plants take the panicle. You know those little alfred pods that appear to stones are shells in the water they rely on the waves to bring them they nutrients and the waves determine how long their penises are where the waves are strong monacos have a shorter penis when the flow is gentler it grows longer and in any case male bonding holes have the longest penis in proportion to their body length any animal. Next week will be heading for bangkok a city that is critically affected by Climate Change how can residents adapt to the constant flooding more abashed on the next edition of tomorrow today c assume. Theres a raging on social. Manipulation. Seems. But thats dictatorship. On social media a threat to society. How can one distinguish between truth some lines. Of social clubs. Exist. Double. 50 percent of americans at some point in our lives will experience hardship listen up. W. Im not all think that just well i guess sometimes i am but i stand up and whimper that Peter Jennings thinks deep into the german culture of looking at the stereotype of a class that is think the future of the country that i dont. Need to change the thickness grandmother. Cause its cold out there. Im rachel join me to meet the gentleman from d. W. Post actually written meters just shows numbers but the rest of shows. The missing. Box. Of the smart way to get where youre going. To go blogger mobility show every week w. Frankfurt. International gateway to the best connection sells road and trail. Located in the huddle. If you are connected to the. Experience outstanding shopping and dining offers and try our services. Be allat guest trend food city managed by from. This is e w news live from berlin more outrage in it iran after the countrys military admits that it shot down a ukrainian passenger jet for a 2nd straight day protesters chanted antigovernment slogans and call authorities liars for additionally designed to shut down the plane on wednesday also coming out. On alert authorities warn a volcano in the philippines is on the verge of a major eruption as it continues spewing a massive plume of ash into the sky