"Mad dog wave" What is it? The meteorologist, said: "mad dog wave" is a fisherman's term for such waves. Northeast of Taiwan is the most commonly affected by the terrain a "mad dog wave" areas. Press the "mad dog wave" causes are the following argument: First, before the sea was relatively calm, there is a sign of the sea suddenly drop very low, then you can see there is a little on the sea front of the wave to push past, if discover, there is enough time to escape. Occurs, sometimes up to several stories tall, often tourists, fishermen and even the vehicle involved in the sea, it is hard to detect. The second is that the "mad dog wave" is a long wave, which is smaller by a variety of different directions of wave drops, rocks or wharf that is suddenly experiencing a strong wave hit the fierce attack and roll up, it may be caused by many a combination of a long surf the waves, V-shaped coast that have experienced a great impact. Third, the causes of the generation of waves in the wind to send scraping, continuing northeast monsoon Chuigua wave resonance with similar wind speeds, often generate a huge surge, a huge thick layer of water which blocks reached the coast, will be pouring in force a Cape beach, the waves collapse note block is the "mad dog wave." Fourth, the views of the experts are not consistent, some scholars believe that the mobility of a small storm, or a different wavelength, the direction of the waves caused by superposition of phase-specific; some scholars believe is caused by submarine landslides; There is a tide that wave or a stream caused by the near-shore; some scholars believe is coming from a long distant Bay waves.
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The origin of mad waves
The "mad dog wave" of the word, people may feel strange. It is how it goes? According to Taiwan Ocean University, Xu Mingguang, John ultrasonic investigation, found that "mad dog wave" is used since 1986 to appear in newspapers and magazines. Taiwan media have reported on more than the northeast coast of Taiwan, swimming, fishing or sightseeing and other activities, it was to be involved in sudden waves of the sea tragedy. Even water-based strong fishermen fishing, the case of "mad dog wave" can not be survived. Because of this big wave suddenly very dangerous, so local people call it "mad dog wave." In recent years, Taiwan's rapid economic development, people began to focus on leisure activities. Taiwan is bounded by the sea, mild climate, is engaged in leisure activities at sea shore and a good place. Local authorities response to public opinion, the construction and coastal recreation-related facilities. Taiwan's northeastern coast in winter, one of the most popular activities is fishing at the beach. Because the occasion of bad weather in the winter, many valuable fish such as black hair, hard tail Aberdeen, fish such as red-tailed winter flood continued to attract a lot of fishermen,. But in recent years, anglers here every year is commonly known as "mad dog wave" swept away by the waves of happened. Taiwan's United Daily News as the "Hatta was swept away by waves more than ten fishermen, nine people were rescued, two were wounded and several missing overnight Sao save" in the title, reported occurred on October 14, 1984 of a "mad dog waves. " According to reports, when the weather is good, micro-wind blowing Hee, microwave sea waves, a dozen people fishing harbor breakwater at the end of the Keelung Badou Zi fishing, 8 pm, a fishermen, that is swept away by strong waves , but the rest are still there fishing. 10:30, suddenly a big wave hit up four or five fishermen, the breakwater was laid, and the remaining six, seven wishes toward a safe place when they were rolling all the big waves hit the sea. After the presence of hundreds of fishermen, and police rescue, nine people were rescued, but several people swept away by strong waves. On this night, in Keelung the other end also occurred with 10 fishermen thrown into the sea. In fact, the "mad dog wave" is not only threatening the shore anglers, offshore fishing boats are sometimes not survived. August 7, 1991 At Suao region had five fishing vessels more than 10 meters in case of "mad dog wave" of attacks and capsized, killing one person and two people missing. "Mad dog wave" of shipping, port facilities, marine and coastal engineering has the potential threats. Panamanian-registered cargo ship An Shima, off the coast of Ilan encounter "mad dog wave" on the deck of five crew members were working volume into the sea, where two crew members died and another three seriously injured. Ship nearly 6,000 tons of cargo bound for South Korea is on the way encountered the "mad dog wave". "Mad dog wave" swallowing things of life in Hong Kong and the mainland coast have occurred. According to Hong Kong Sing Pao Daily News December 28, 1994 report, Hong Kong Island stone beach after a group of high school students watch the waves on the sea side of the rock, suddenly reveal a big wave will roll into the sea in which a student missing. In some coastal areas of China's mainland has repeatedly happened "mad dog wave" swept away people's events. But not many people seen in the newspapers. For example, September 1, 1992 afternoon, a teacher brought her to the mainland city of Lu Xun Park, Qingdao, beach play, a piece of rock on the shore next to pictures of his daughter, the moment you press the shutter, big wave suddenly hit, the beloved daughter involved in the sea, died. From the Taiwan media coverage of such events to see, a "mad dog wave" of casualties varies from one or two, as many as a dozen people. One serious one, wave three stories high, so high waves, the parked cars are also involved in the shore of the sea. Accordingly, Keelung City had decided to ban fishing in some coastal sections, to visit.
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Mad dog waves of history
疯狗浪的研究历史
A more systematic study of the first "mad dog wave" of scholars in Taiwan Ocean University, Xu Mingguang, John Chao and Kung University Professor Gao Jiajun, who collected from 1951 to the end of 1992 seen in the newspapers of the "mad dog wave" reported a total of about 140 pieces , known to have ruled out when the typhoon winds and waves at the beach playing in the water and swept away in case water accidentally drowned or unfamiliar things, the total was 73 cases. In order to explore the "mad dog wave" of the causes of their region in the northeast corner of the ultrasonic measuring device wave device, monitoring, and installation of all-weather synthetic aperture radar satellite to monitor sea level rise and fall, unfortunately, none of the current record to be able to explain the problem information. On the "mad dog wave" occurred the season, location, form of expression point of view, we found that season, the winter and spring and summer at the turn of events more. The region, northeastern Taiwan, the most frequent, and many events and typhoons, of which Taiwan is very far away from some of the typhoon, meteorological department has not issued a typhoon warning at sea, fishermen, the neglect of the potential threat of a typhoon swell and killed This numerical simulation to be verified. Excluding long-Bay typhoon, there are still very large number of the "mad dog wave" of unknown causes, pending the collection of field data and subsequent numerical simulation. Speaking of natural disasters, the most scary do not know when a disaster comes. Such as typhoons, tornadoes, earthquakes, tsunamis, landslides, floods, droughts and other natural physical phenomena are due to scientific progress, most of the natural disasters have an understanding of its causes and to forecast and reduce people's sense of panic. Although the "mad dog wave" event every year the number of casualties than any other major natural disasters, man-made and so much less, but I do not know when to place the potential threat alum shore fishing, offshore, coastal construction who have concerns. "Mad dog wave" of how it was, there has been no clear definition, its causes needs to be further studied. Taiwan, more consistent view of the experts, "mad dog wave" is the result of long-Chung, and typhoons and monsoons are likely to produce long swell. Have been confirmed to have part of the "mad dog wave" events do with the typhoon, which has been observed in Taiwan and the mainland coast confirmed by the fact that, according to the views of many scholars in Taiwan, "mad dog wave" is likely to be from the northeast monsoon, typhoon, topography, wave, tide and other causes, however, play an important role for any reason, Where is one kind of terrain or what kind of wind direction, flow rates are most likely to occur, need further study. People know that the "mad dog wave" of the existence and characteristics, while at the beach while playing, be especially careful to avoid sudden "mad dog wave" swallowed, resulting in tragedy. As professionals, "mad dog wave" in-depth study of the causes, can be confident that their prediction will eventually become a reality. Until then, anglers and tourists to the seaside tourist can get rid of "mad dog wave" shadow, really enjoy the fun of seaside leisure.
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Mad wave of possible causes
疯狗浪的可能成因
We are now on the "mad dog wave" is still little understood, its possible causes are discussed below: (2) the direction of the wavelength of the wave number of random drops: from the physical point of view, when the waves meet, whether same or opposite, will have a superposition of waves, but the situation is to make the composite wave growth or cut it all depends on when the waves superimposed position. In different waves meet, if η1 = a sin (k2 x-σ1t); η2 = a sin (k2x-σ2t) Synthesized: ηtotal = η1 + η2 = 2a cos [1 / 2 (k1-k2) x-1 / 2 (σ1-σ2) t] sin [1 / 2 (k1 + k2) x-1 / 2 (σ1 + σ2) t] If the superposition of the wave to crest stacked composite wave will be a great income, if the superposition of waves are many, but the peak is stacked, the monstrous big wave is not impossible, only a very small probability. 3 deep-sea long-wave into the shallow water under rapid changes in the results: If the waves from deep to shallow water areas to pass slowly, because the depth has changed, according to the wave of the physical nature of the original deep-water wave velocity, wavelength, wave height, will So change. In velocity, we know that velocity c2 = g / k tanh kd. That is, the wave is moving faster than deep-water waves in shallow water waves, so the deep-water waves to shallow water, the speed slows down, but the wave height but also to high , and the reason is that when waves pass, the theory of energy conservation, energy value e = 1 / 8 ρgh2 the inferred shallow and deep water wave height h h0 than high MW: h/h0 = {2cos2 (kd) / [2kd + sinh (2kd)]} 1 / 2 so the waves from deep water into shallow water, the first reduction wave height, water depth of more than 0.159 times until the long hours of deep-water wave, wave height will be rapidly increase. Back to topic, when the distance came the long-wave into the shallow sea area, the front first into the shallow water wave, slow wave velocity, the wavelength becomes smaller, the wavelength cut first and then grow to be moved into shallow water wave after wave of rapid growth of high , then the back part of the deep and to catch up due to water, standing waves and breaking forward to form hide the "mad dog wave."
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How crazy mad waves
Long known as a mad dog; and the Mad Dog to describe such harmful waves, also revealed that the number of expressive meaning. Generally known as a mad dog, there are two arguments. The first argument is the alleged real mad dog, to see who will bite at any time, it is in a frenzied state. The second argument is that such a dog usually is normal, nothing abnormal, but in a certain special circumstances, such as Fengkuang Ban will bite, then someone will call it mad. (B) good weather, no wind, calm sea, a big wave suddenly appeared on the shore, the impact of the coast, this time as the shore was, it is very easy to be drawn into the sea, this is the "second type of mad dog wave" of a normal dog as suddenly mouth bite, it is difficult to prevent. As mentioned earlier each year from May to July and October-February period of the so-called mad dog wave incidents occur more frequently, in fact, this tells us about this incident and the monsoon. Taiwan's geographic location in the monsoon region, per year from June to September southwest wind blowing, and from October to March next year blowing northeast, and the remaining time for the monsoon transition. Wave size and wind strength, duration of hair and the wind blowing in the distance is proportional to the surface. However, the monsoon is not only near Taiwan, it is blown when Taiwan has thousands of kilometers away from their hair, for example, when the strong northeast monsoon, hair count from Hokkaido to Taiwan by Japan, the type of stroke during the monsoon season is ideal for wave growth, which formed a kind of far away and can go to Taiwan, what we call surge wave (or long wave), the so-called surge is to leave the hair area of the wave, because it's less likely in the long length road on the way out so the attenuation can be run very far. Long waves also have a feature is its wave height can be high, so powerful in the monsoon season, there are large swells often appear when the big waves occur when the sea of people involved in the sea of opportunity to greatly increase. Why the so-called mad dog in the Northeast Coast of the incident wave frequency up, the reason is nothing more than just the northeast coast in the direction opposite the north-easterly winds. Similarly to push Taiwan's southwest coast in the southwest monsoon season, there is more chance of a big swell. Mad dog wave incident is the second time a typhoon comes, in fact, strictly speaking it should be said that the typhoon surge comes. Everyone knows there are storms and typhoons in the vicinity, but outside the typhoon zone although there is no wind, swell, and this surge than the northeast monsoon surge is more dangerous, because the northeast monsoon comes, will be associated with wind and rain, fishing friends They will know the weather is not very good, more vigilance, but the typhoon surge comes Taiwan typhoon storm circle may not be quite clear and the weather, the beach activities were not on the more wary. Like after the 1996 Mid-Autumn Festival September 30 to October 2, the night between the northeastern coast took place in four thrown into the sea. Keelung was no rain and wind, but off the coast of northeastern Taiwan, although there are ex-Yates and two typhoons, it creates a very strong surge, the average wave height of the Northeast Coast had reached 10 meters. Therefore, regardless of typhoon near Taiwan in the southern, eastern or northern, the fish must be extremely cautious swell friends there. There is a typhoon hit Taiwan, the formation of large waves may be any coast, to see the position of the typhoon. Tides have some relationship with the big swell. When thrown into the sea, the majority of their time in the tide times before, that the faithful may fish on the fish at high tide times greater chance of fishing, the higher number, so the chances of events into the sea was relatively increased. But the other thing we must note that when the tide, especially the Lunar who started in the vicinity of the tide times, tide times the highest sea level, water depth deeper water, big waves and therefore more easily washed ashore, this time must also be Be careful. Sea wave is large when a small, difficult to estimate in a wave after the next wave height, which is the wave height changes in randomness. But the faithful believe that fish can be observed while fishing at the beach to another phenomenon called the group of wave phenomena. Waves hit the coast, mostly in groups over several waves, the wave immediately after the small group came down, but soon there came a group of big waves, each wave can be a group to the composition of several waves, often in front of a group of several waves are not great, but the middle will have several large waves, the big wave behind the wave is smaller When a group of waves came, the first few waves did not go ashore, but the higher waves might come up, which explains why not every time a big wave to wave will come ashore, but all of a sudden there will be several large waves roll up the people down. Perhaps this is known as the mad wave of reasons. For the first type of mad dog waves on the shore we can already clearly see it continue to beat the coast. That shore is rough seas, but actually there are brave in the coastal fishing or swimming, as the waves roll's accident occurred, is often the result of selfless individual tourists. The second type of mad dog waves, the sea is often a sign of no big waves, very difficult to run away, is easier to damage to the shore fishermen or tourists. This type of mad dog waves, more difficult to prevent, what we need to study the object.
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How to prevent mad waves
如何防范疯狗浪
如何防范疯狗浪
如何防范疯狗浪
(A) dangerous place: the sea-bed steep place, that is not far from shore, water depth immediately becomes deep. This sea-bed, will make the location very close to the shore breaking wave, the surf the water wall will be easily washed ashore. Where these places generally include the following: 1 prominent coastal reef. 2 vertical wall surface of the offshore platform or seawall. 3. Breakwater, the lighthouse, especially near the breakwater. (B) the dangerous season: 1. A strong winter monsoon winds, the wind strong waves, the sea rough nature, this time not to coast fishing or swimming. Usually winter in Taiwan, the Yellow Sea or East China Sea has Lengfeng occurs, follow the northeast monsoon is strong, the resulting waves will directly hit the coast, may have a "mad dog wave the first type." 2 summer typhoon season: (1) the island of Taiwan has entered the typhoon storm radius, that weather has issued land and sea typhoon warning, people should avoid entering the coastal zone, to prevent "the first type of mad dog wave" generation. (2), although the sea far away from Taiwan habits (such as typhoons in the Philippines, the East Sea or the South China Sea).
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Mad waves of the survey
疯狗浪之调查
疯狗浪之调查
After checking the total was 73 cases. Satellite synthetic aperture radar (synthetic aperture radar) microwave transmitter on their own to receive the echo, so you can use at night, and because longer-wavelength microwaves can penetrate clouds and rain, so all-weather synthetic aperture radar to monitor sea. If the "mad dog wave" before the synthetic aperture radar to have the image data 1 location of the incident To look at the incident location, angle to the northeast of Taiwan wealth Sandiaojiao highest number occurred in a total of 28 times. Perhaps more people fishing, and perhaps more dangerous terrain, easy to form a "mad dog wave." To points in the month, May 11, 12 and January 10 is the largest to look at the season, November to January a total of 28 times and 25 times from May to July as the most, while February to April 7 times and 12 times at least 8-10 months. If things had gone casualties are engaged in job classification, Fishing 41, play 55, 27 sea fishing. (2) the number of cases Some "mad dog wave" event is likely only in the local version and the version is not published in Taipei, the reporter may not be published without notice, or only in local newspapers and therefore leakage. In addition, the "mad dog wave" of cases published in the newspaper on the layout, or crowded by the newspaper revision draft and move to other pages, or because the event is small, small number of deaths, so the title has little access to those and other reasons to be missed. Thus, the real events than in this study to collect more. If necessary, may be reported to the local police station to collect data. 40 to 55 years can be found only happen two, 56 years to 72 years the average annual one, but 73 years to 81 years the average annual 5. "Mad dog wave" event in recent years has increased dramatically. 3 in situ Bitou Cape wave recorder modified after August 7, 1981 early morning, fishing boat occurred Suao region was "mad dog wave" attacks and rollover events, however, angular nose did not find any record of exceptions. Bitou Cape is not far to the Su-ao, the wave record is not unusual, one of the reasons may be a "mad dog wave" occurs only in very small range, the other may be a "mad dog wave" of the delay is very short, is the nose angle wave recorder omitted. Understanding the "mad dog wave" of the sources and causes must have help. Unfortunately, so far have failed to collect the "mad dog wave" events synthetic aperture radar images of the day information. According to the survey, Taiwan has sixty-four more dangerous rock fishing games, including Hsinchu, Taoyuan area, Tamsui port, Yehliu Cape District, Keelung large Wulun, Keelung Peace Island, Badou Zi, deep Australia, Shueinan hole, Nanya area nose District, U.S. District Cave, Sandiaojiao, Yingge Stone, Taku O, Shicheng Dali, Dasi area, Beiguan Doo public areas, Hualien, Taitung and Keelung Island area and other 20 districts sixty-four fishing Bureau of Meteorology said the rock fishing fields are marked with a warning or ban, fishermen, should beware. A so-called mad dog is a large swell waves. The timing of the formation of two major surge in the monsoon season and when a typhoon near Taiwan. 3 winter, when strong northeast winds will be a large surge appear Northeast Coast. 4 summer when strong southwest monsoon coast should be noted that the risk of large swells. 5 typhoon if you go in the sea off the coast, please be especially careful, it is best not to go. 6 Lunar or fifteen who started three days before and after the full tide of time, if the monsoon or typhoon factors exist, a large swell of the opportunities as well.
