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Seiches and Rude Intel - Faex Optim - Tris·kai·dek·a·pho·bi·a phenomena have been observed on lakes, reservoirsswimming pools, bays, harbours and seas.
The key requirement for formation of a seiche is that the body of water be at least partially bounded, allowing the formation of the Once Upon A Time - Various - Just The Best 4/98 wave.
Seiches in harbours can be caused by long period or infragravity waveswhich are due to subharmonic nonlinear wave interaction with the wind waveshaving periods longer than the accompanying wind-generated waves. Seiches are often imperceptible to the naked eye, and observers in boats on the surface may not notice that a seiche is occurring due to the extremely long wavelengths. The effect is caused by resonances in a body of water that has been disturbed by one or more factors, most often meteorological effects wind and atmospheric pressure variationsseismic activity, or tsunamis.
Vertical harmonic motion results, producing an impulse that travels the length of the basin at a velocity that depends on the Prophylactic Liquidation Of Our Pig Government - Various - Variable Resistance (Ten Hours Of Sound F of the water. The impulse is reflected back from the end of the basin, generating interference.
Repeated reflections produce standing waves with one or more nodes, or points, that experience no vertical motion. The frequency of the oscillation is determined by the size of the basin, its depth and contours, and the water temperature. The longest natural period of a seiche is the period associated with the fundamental resonance for the body of water—corresponding to the longest standing wave. For a surface seiche in an enclosed rectangular body of water this can be estimated using Merian's formula:  .
Higher order harmonics are also observed. The period of the second harmonic will be half the natural period, the period of the third harmonic will be a third of the natural period, and so forth. Seiches have been observed on both lakes and seas. The key requirement is that the body of water be partially constrained to allow formation of standing Waves - Lake Keepers - Siecle.
Regularity of geometry is not required; even harbours with exceedingly irregular shapes are routinely observed to oscillate with very stable frequencies. Low rhythmic seiches are almost always present on larger lakes. They are usually unnoticeable among the common wave patterns, except during periods of unusual calm.
Harboursbaysand estuaries are often prone to small seiches with amplitudes of a few centimetres and periods of a few minutes. Among other lakes well known for their regular seiches is New Zealand's Lake Wakatipuwhich varies its surface height at Queenstown by 20 centimetres in a minute cycle. Seiches can also form in semi-enclosed seas; the North Sea often experiences a lengthwise seiche with a period of about 36 hours.
The National Weather Service issues low water advisories for portions of the Great Lakes when seiches of 2 feet or greater are likely to occur. The effect is similar to a storm surge like that caused by hurricanes along ocean coasts, but the seiche effect can cause oscillation back and forth across the lake for some time. Inthe remnants of Hurricane Hazel piled up water along the northwestern Lake Ontario shoreline near Torontocausing extensive flooding, and established a seiche that subsequently caused flooding along the south shore.
Lake seiches can occur very quickly: on July 13,a large seiche on Lake Superior caused the water level to fall and then rise again by three feet one metre within fifteen minutes, leaving some boats hanging from the docks on their mooring lines when the water retreated. Earthquake -generated seiches can be observed thousands of miles away from the epicentre of a quake. Swimming pools are especially prone to seiches caused by earthquakes, as the ground tremors often match the resonant frequencies of small bodies of water.
The Northridge earthquake in California caused swimming pools to overflow across southern California. The massive Good Friday earthquake that hit Alaska in caused seiches in swimming pools as far away as Puerto Rico .
The Indian Ocean earthquake caused seiches in standing water bodies in many Indian states as well as in BangladeshNepal and northern Thailand. The Assam—Tibet earthquake is known to have generated seiches as far away as Norway and southern England.
The February 27, Chile earthquake produced a seiche on Lake PontchartrainLouisiana with a height of around 0. The Waves - Lake Keepers - Siecle El Mayor earthquake produced large seiches that quickly became an internet phenomenon.
Seiches up to at least 1. Seiches have been observed in seas such as the Adriatic Sea and the Baltic Sea. This results in Waves - Lake Keepers - Siecle flooding of Venice and St. Petersburgrespectively, as both cities are constructed on former marshland.
In St. Petersburg, seiche-induced flooding is common along the Neva River in the autumn. The seiche is driven by a low pressure region in the North Atlantic moving onshore, giving rise to cyclonic lows on the Baltic Sea. The low pressure of the cyclone draws greater-than-normal quantities of water into the virtually land-locked Baltic. As the cyclone continues inland, long, low-frequency seiche waves with wavelengths up to several hundred kilometres are established in the Baltic.
When the waves reach the narrow and Waves - Lake Keepers - Siecle Neva Bay, they become much higher — ultimately flooding the Neva embankments.
Nagasaki Bay is a typical area in Japan where seiches have been observed from time to time, most often in the spring — especially in March. On 31 Marchthe Nagasaki tide station recorded a maximum water-level displacement of 2. The maximum water-level displacement in the whole bay during this seiche event is assumed to have reached 4.
Seiches in Western Kyushu — including Nagasaki Bay — are often induced by a low in the atmospheric pressure passing South of Kyushu island. Seiches not only cause damage to the local fishery but also may result in flooding of the coast around the bay, as well as in the destruction of port facilities. On occasion, tsunamis can produce seiches as a result of local geographic peculiarities.
For instance, the tsunami that hit Hawaii in had a fifteen-minute interval between wave fronts. The natural resonant period of Hilo Bay is about thirty minutes. That meant that every second wave was in phase with the motion of Hilo Bay, creating a seiche in the bay. As a result, Hilo suffered worse damage than any other place in Hawaii, with the combined tsunami and seiche reaching a height of 26 feet along the Hilo Bayfront, killing Black Night - Ritchie Blackmores Rainbow* - Memories In Rock - Live In Germany people in the city alone.
Seiche waves may continue for several days after a tsunami. Tide-generated internal solitary waves solitons can excite coastal seiches at the following locations: Magueyes Island in Puerto Rico,    Puerto Princesa in Palawan Island,  Trincomalee Bay in Waves - Lake Keepers - Siecle Lanka,   and in the Bay of Fundy in eastern Canada, where seiches cause some of the highest recorded tidal fluctuations in the world.
These waves can generate a sufficient current at the shelf break Waves - Lake Keepers - Siecle excite coastal seiches.
Seiches are also observed beneath the lake surface acting along the thermocline  in constrained bodies of water. In analogy with the Merian formula, the expected period of the internal wave can be expressed as: . Engineers consider seiche phenomena in the design of flood protection works e. From Wikipedia, the free encyclopedia. A standing wave in an enclosed or partially enclosed body of water.
For other uses, see Seiche disambiguation. This section needs expansion. You can help by adding to it. June See also: Coastal engineering. London: John Murray. Origin and generation of waves. Coastal Engineering International Conference.
Dynamical oceanography. London: Methuen. Basel: Schweighauser. July 5, Archived from the original PDF on May 17, Retrieved April 19, Retrieved Archived at the Wayback Machine Retrieved on At Lake Tahoe?
Science News. Society for Science and the Public. Retrieved 19 April Amateur Seismic Centre. Posted: April 27, ". Retrieved 17 October Ars Technica. The funnel-like shape increases the height of the tide above normal, and the flood appears as a relatively rapid increase in the water level. Journal of Oceanographical Society of Japan. Hollander; J. Fancher; B.
Giese Geophysical Research Letters. Bibcode : GeoRL Waves - Lake Keepers - Siecle Peter G. Black; John A. Fornshell Bibcode : JPO Woodworth; D. Pugh
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