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:''This article refers to the natural event. For other uses, see [[Avalanche (disambiguation)]]''
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[[File:2007-02-15-CLB-Couloir2-1c.JPG|thumb|right|300px|Dry [[snow]] avalanche with a powder cloud]]
[[File:Avalanche on Everest.JPG|thumb|right|300px|A powder snow avalanche in the [[Himalayas]] near [[Mount Everest]].]]
[[File:AvalancheToe.jpg|thumb|right|300px|The toe of an avalanche in [[Alaska]]'s [[Kenai Fjords National Park|Kenai Fjords]].]]
[[File:Lawine.jpg|thumb|right|300px|Dry [[snow]] avalanche with a powder cloud]]


An '''avalanche''' (also called a '''snowslide''' or '''snowslip''') is a rapid flow of [[snow]] down a sloping surface. Avalanches are typically triggered in a starting zone from a mechanical failure in the [[snowpack]] (slab avalanche) when the forces on the snow exceed its strength but sometimes only with gradually widening (loose snow avalanche). After initiation, avalanches usually accelerate rapidly and grow in mass and volume as they [[Entrainment (physical geography)|entrain]] more snow. If the avalanche moves fast enough some of the snow may mix with the air forming a powder snow avalanche, which is a type of [[gravity current]].
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Slides of rocks or debris, behaving in a similar way to snow, are also referred to as avalanches (see [[rockslide]]<ref>{{cite web|url=http://geology.campus.ad.csulb.edu/people/bperry/Mass%20Wasting/Flows.htm |title=Flows |publisher=Geology.campus.ad.csulb.edu |date= |accessdate=2013-06-21}}</ref>). The remainder of this article refers to snow avalanches.
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The load on the snowpack may be only due to gravity, in which case failure may result either from weakening in the snowpack or increased load due to precipitation. Avalanches that occur in this way are known as spontaneous avalanches. Avalanches can also be triggered by other loads such as skiers, snowmobilers, animals or explosives. Seismic activity may also trigger failure in the snowpack and avalanches.
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Although primarily composed of flowing snow and air, large avalanches have the capability to entrain ice, rocks, trees, and other material on the slope, and are distinct from [[Mudflow|mudslides]], [[Landslide|rock slides]], and [[serac]] collapses on an [[icefall]]. Avalanches are not rare or random events and are endemic to any mountain range that accumulates a standing snowpack. Avalanches are most common during winter or spring but glacier movements may cause ice and snow avalanches at any time of year. In mountainous terrain, avalanches are among the most serious objective [[natural hazard]]s to life and property, with their destructive capability resulting from their potential to carry enormous masses of snow at high speeds.
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There is no universally accepted classification of avalanches—different classifications are useful for different purposes. Avalanches can be described by their size, their destructive potential, their initiation mechanism, their composition and their dynamics.
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{{refimprove section|date=July 2009}}
[[File:Crown line on neve glacier snow field peak north cascades.jpg|thumb|right|300px|A crown fracture from a slab avalanche near the Neve Glacier in the [[North Cascades]] mountains. Extensive fracture propagation is evident.]]
[[File:Loose snow and slab avalanches near mt shuksan.jpg|thumb|right|300px|Loose snow avalanches ( far left ) and slab avalanches ( near center ) near [[Mount Shuksan]] in the [[North Cascades]] mountains. Fracture propagation is relatively limited.]]
[[File:Snowboarder triggered soft slab near mount baker.jpg|thumb|right|300px|15cm deep, soft slab avalanche triggered by a snowboarder near Heliotrope Ridge, [[Mount Baker]] in March 2010. Multiple crown fracture lines are visible in the top-middle of the image. Note the granular characteristic of the debris in the foreground that results from the slab breaking up during descent.]]


Most avalanches occur spontaneously during storms under increased load due to snowfall. The second largest cause of natural avalanches is metamorphic changes in the snowpack such as melting due to solar radiation. Other natural causes include rain, earthquakes, rockfall and icefall. Artificial triggers of avalanches include skiers, snowmobiles, and controlled explosive work.
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Avalanche initiation can start at a point with only a small amount of snow moving initially; this is typical of wet snow avalanches or avalanches in dry unconsolidated snow. However, if the snow has sintered into a stiff slab overlying a weak layer then fractures can propagate very rapidly, so that a large volume of snow, that may be thousands of cubic meters, can start moving almost simultaneously.
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A snowpack will fail when the load exceeds the strength. The load is straightforward; it is the weight of the snow. However, the strength of the snowpack is much more difficult to determine and is extremely heterogenous. It varies in detail with properties of the snow grains, size, density, morphology, temperature, water content; and the properties of the bonds between the grains.
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<ref name="McClung 2006">McClung, David and Shaerer, Peter: The Avalanche Handbook, The Mountaineers: 2006. ISBN 978-0-89886-809-8</ref> These properties may all metamorphose in time according to the local humidity, water vapour flux, temperature and heat flux. The top of the snowpack is also extensively influenced by incoming radiation and the local air flow. One of the aims of avalanche research is to develop and validate computer models that can describe the evolution of the seasonal snowpack over time.<ref>[http://www.mendeley.com/research/a-physical-snowpack-model-for-the-swiss-avalanche-warning-part-i-numerical-model/ SNOWPACK ]{{dead link|date=June 2013}}</ref> A complicating factor is the complex interaction of terrain and weather, which causes significant spatial and temporal variability of the depths, crystal forms, and layering of the seasonal snowpack.
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=== Slab avalanches ===
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Slab avalanches form frequently in snow that has been deposited, or redeposited by wind. They have the characteristic appearance of a block of snow cut out from its surroundings by fractures. Elements of slab avalanches include the following: a crown fracture at the top of the start zone, flank fractures on the sides of the start zones, and a fracture at the bottom called the staunchwall. The crown and flank fractures are vertical walls in the snow delineating the snow that was entrained in the avalanche from the snow that remained on the slope. Slabs can vary in thickness from a few centimetres to three metres. Slab avalanches account for around 90% of avalanche-related fatalities in backcountry user.


=== Powder snow avalanches ===
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</ul>


The largest avalanches form turbulent suspension currents known as [[powder snow avalanche]]s or mixed avalanches. These consist of a powder cloud, which overlies a dense avalanche. They can form from any type of snow or initiation mechanism, but usually occur with fresh dry powder.
== 1hnPV4 jordans TEmoixBC ==
They can exceed speeds of 300&nbsp;km/h, and masses of 10,000,000&nbsp;tonnes; their flows can travel long distances along flat valley bottoms and even uphill for short distances.


=== Wet snow avalanches ===
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相关的主题文章：
In contrast to powder snow avalanches, wet snow avalanches are a low velocity suspension of snow and water, with the flow confined to the track surface (McClung, first edition 1999, page 108).<ref name="McClung 2006"/> The low speed of travel is due to the friction between the sliding surface of the track and the water saturated flow. Despite the low speed of travel (~10–40&nbsp;km/h), wet snow avalanches are capable of generating powerful destructive forces, due to the large mass, and density. The body of the flow of a wet snow avalanche can plough through soft snow, and can scour boulders, earth, trees, and other vegetation; leaving exposed, and often scored, ground in the avalanche track. Wet snow avalanches can be initiated from either loose snow releases, or slab releases, and only occur in snow packs that are water saturated and isothermally equilibrated to the melting point of water. The isothermal characteristic of wet snow avalanches has led to the secondary term of isothermal slides found in the literature (for example in Daffern, 1999, page 93).<ref name="Daffern 1999">Daffern, Tony: Avalanche Safety for Skiers, Climbers and Snowboarders, Rocky Mountain Books: 1999. ISBN ISBN 0-921102-72-0</ref> At temperate latitudes wet snow avalanches are frequently associated with climatic avalanche cycles at the end of the winter season, when there is significant daytime warming.
<ul>
 
 
==Terrain, snowpack, weather==
  <li>[http://cyclingcentralshop.com.au/index.php?item/create_form/1 http://cyclingcentralshop.com.au/index.php?item/create_form/1]</li>
Doug Fesler and Jill Fredston developed a conceptual model of the three primary elements of avalanches: terrain, weather, and snowpack. Terrain describes the places where avalanches occur, weather describes the meteorological conditions that create the snowpack, and snowpack describes the structural characteristics of snow that make avalanche formation possible.<ref name="McClung 2006"/><ref>Fesler, Doug and Fredston, Jill: Snow Sense, Alaska Mountain Safety Center, Inc. 2011. ISBN 978-0-615-49935-2</ref>
 
 
  <li>[http://www.ikompass.com.my/index.php?item/create_form/1 http://www.ikompass.com.my/index.php?item/create_form/1]</li>
===Terrain===
 
[[File:North Ridge of Mount Rohr.jpg|thumb|250px|In steep avalanche-prone terrain, traveling on [[ridge]]s is generally safer than traversing the slopes.]]
  <li>[http://www.12meetsenior.com/s/index.php?item/create_form/1 http://www.12meetsenior.com/s/index.php?item/create_form/1]</li>
Avalanche formation requires a slope where snow can accumulate, yet has enough steepness for the snow to accelerate once set in motion by the combination of mechanical failure (of the snowpack) and gravity. The angle of the slope that can hold snow, called the [[angle of repose]], depends on a variety of factors such as crystal form and moisture content. Some forms of drier and colder snow will only stick to lower angle slopes; while wet and warm snow can bond to very steep surfaces. In particular, in coastal mountains, such as the [[Cordillera del Paine]] region of [[Patagonia]], deep snowpacks collect on vertical, and overhanging, rock faces. The angle of slope that can allow moving snow to accelerate depends on a variety of factors such as the snow's shear strength, which is itself dependent upon crystal form, and the configuration of layers and inter-layer interfaces.
 
[[File:Avalanche path 7271.JPG|thumb|left|Avalanche path with {{convert|800|m|ft}} vertical fall in the [[Glacier Peak Wilderness]], [[Washington (state)|Washington State]]. Avalanche paths in alpine terrain may be poorly defined because of limited vegetation. Below tree line, avalanche paths are often delineated by vegetative trim lines created by past avalanches. The start zone is visible near the top of the image, the track is in the middle of the image and clearly denoted by vegetative trimlines, and the runout zone is shown at the bottom of the image. One possible timeline is as follows: an avalanche forms in the start zone near the ridge, and then descends the track, until coming to rest in the runout zone.]]
  <li>[http://www.heatdating.co.za/s/index.php?item/create_form/1 http://www.heatdating.co.za/s/index.php?item/create_form/1]</li>
[[File:Mount Windsor Cornice2.jpg|thumb|right|250px|A [[cornice (climbing)|cornice]] of snow about to fall. Cracks in the snow are visible in area (1). Area (3) fell soon after this picture was taken, leaving area (2) as the new edge.]]
 
 
  <li>[http://www.kiwivapers.com/index.php?item/create_form/1 http://www.kiwivapers.com/index.php?item/create_form/1]</li>
The snowpack on slopes with sunny exposures is strongly influenced by [[Sunlight|sunshine]]. Diurnal cycles of thawing and refreezing can stabilize the snowpack by promoting settlement. Strong freeze thaw cycles result in the formation of surface crusts during the night, and the formation of unstable surface snow during the day. Slopes in the lee of a ridge or other wind obstacle accumulate more snow and are more likely to include pockets of deep snow, [[wind slabs]], and [[cornice (climbing)|cornices]], all of which, when disturbed, may result in avalanche formation. Conversely the snowpack on a windward slope is often much shallower than on lee slopes.
 
 
</ul>
Avalanches and avalanche paths share common elements: a start zone where the avalanche originates, a track along which the avalanche flows, and a runout zone where the avalanche comes to rest. The debris deposit is the accumulated mass of the avalanched snow once it has come to rest in the runout zone. For the image at left, many small avalanches form in this avalanche path every year, but most of these avalanches do not run the full vertical or horizontal length of the path. The frequency with which avalanches form in a given area is known as the [[return period]].
 
The start zone of an avalanche must be steep enough to allow snow to accelerate once set in motion, additionally [[Convex function|convex]] slopes are less stable than [[concave function|concave]] slopes, because of the disparity between the [[tensile strength]] of snow layers and their [[compressive strength]]. The composition and structure of the ground surface beneath the snowpack influences the stability of the snowpack, either being a source of strength or weakness. Avalanches are unlikely to form in very thick forests, however boulders and sparsely distributed vegetation can create weak areas deep within the snowpack, through the formation of strong temperature gradients. Full-depth avalanches (avalanches that sweep a slope virtually clean of snow cover) are more common on slopes with smooth ground cover, such as grass or rock slabs.
 
Generally speaking, avalanches follow drainages down slope, frequently sharing drainage features with summertime watersheds. At and below tree line, avalanche paths through drainages are well defined by vegetation boundaries called [[trim line]]s, which occur where avalanches have removed trees and prevented regrowth of large vegetation. Engineered drainages, such as the [[avalanche dam]] on [[Mount Stephen]] in [[Kicking Horse Pass]], have been constructed to protect people and property, by redirecting the flow of avalanches. Deep debris deposits from avalanches will collect in catchments at the terminus of a run out, such as gullies, and river beds.
 
Slopes flatter than 25&nbsp;degrees or steeper than 60&nbsp;degrees typically have a lower incidence of avalanche involvement. Human triggered avalanches have the greatest incidence when the snow's [[angle of repose]] is between 35 and 45&nbsp;degrees; the critical angle, the angle at which human-triggered avalanches are most frequent, is 38&nbsp;degrees. But when the incidence of human triggered avalanches are normalized by the rates of recreational use hazard increases uniformly with slope angle, and no significant difference in hazard for a given exposure direction can be found.<ref name="Pascal Hageli et al">[http://www.avisualanche.ca/publications.html Pascal Hageli et al.]</ref>  The rule of thumb is: ''A slope that is flat enough to hold snow but steep enough to ski has the potential to generate an avalanche, regardless of the angle.''
 
===Snowpack structure and characteristics===
[[File:D Hoarfrost 3.jpg|thumb|After surface [[hoarfrost]] becomes buried by later snowfall, the buried hoar layer can be a weak layer upon which upper layers can slide.]]
 
The snowpack is composed of ground-parallel layers that accumulate over the winter. Each layer contains ice grains that are representative of the distinct meteorological conditions during which the snow formed and was deposited. Once deposited, a snow layer continues to evolve under the influence of the meteorological conditions that prevail after deposition.
 
For an avalanche to occur, it is necessary that a snowpack have a weak layer (or instability) below a slab of cohesive snow. In practice the formal mechanical and structural factors related to snowpack instability are not directly observable outside of laboratories, thus the more easily observed properties of the snow layers (e.g. penetration resistance, grain size, grain type, temperature) are used as index measurements of the mechanical properties of the snow (e.g. [[tensile strength]], [[friction]] coefficients, [[shear strength]], and [[Ductility|ductile strength]]). This results in two principal sources of uncertainty in determining snowpack stability based on snow structure:  First, both the factors influencing snow stability and the specific characteristics of the snowpack vary widely within small areas and time scales, resulting in significant difficulty extrapolating point observations of snow layers across different scales of space and time. Second, the relationship between readily observable snowpack characteristics and the snowpack's critical mechanical properties has not been completely developed.
 
While the deterministic relationship between snowpack characteristics and snowpack stability is still a matter of ongoing scientific study, there is a growing empirical understanding of the snow composition and deposition characteristics that influence the likelihood of an avalanche. Observation and experience has shown that newly fallen snow requires time to bond with the snow layers beneath it, especially if the new snow falls during very cold and dry conditions. If ambient air temperatures are cold enough, shallow snow above or around boulders, plants, and other discontinuities in the slope, weakens from rapid crystal growth that occurs in the presence of a critical temperature gradient. Large, angular snow crystals are indicators of weak snow, because such crystals have fewer bonds per unit volume than small, rounded crystals that pack tightly together. Consolidated snow is less likely to slough than loose powdery layers or wet isothermal snow; however, consolidated snow is a necessary condition for the occurrence of [[slab avalanche]]s, and persistent instabilities within the snowpack can hide below well-consolidated surface layers. Uncertainty associated with the empirical understanding of the factors influencing snow stability leads most professional avalanche workers to recommend conservative use of avalanche terrain relative to current snowpack instability.
 
===Weather===
[[File:Avalanche testing snow pit.JPG|thumb|left|250px|After digging a snow pit, it is possible to evaluate the snowpack for unstable layers. In this picture, snow from a weak layer has been easily scraped away by hand, leaving a horizontal line in the wall of the pit.]]
Avalanches can only occur in a standing snowpack. Typically winter seasons at high latitudes, high altitudes, or both, have weather that is sufficiently unsettled, and cold enough for precipitated snow to accumulate into a seasonal snowpack. [[Continentality]], through its potentiating influence on the meteorological extremes experienced by snowpacks, is an important factor in the evolution of instabilities, and consequential the occurrence of avalanches. Conversely, proximity to [[Oceanic climate|coastal environments]] moderates the meteorological extremes experienced by snowpacks, and results in a faster stabilization of the snowpack after storm cycles.<ref>Whiteman, Charles David: Mountain Meteorology: Fundamentals and Applications, Oxford University Press: 2001. ISBN 0-19-513271-8</ref>  The evolution of the snowpack is critically sensitive to small variations within the narrow range of meteorological conditions that allow for the accumulation of snow into a snowpack. Among the critical factors controlling snowpack evolution are: heating by the sun, [[radiational cooling]], vertical [[temperature gradient]]s in standing snow, snowfall amounts, and snow types. Generally, mild winter weather will promote the settlement and stabilization of the snowpack; and conversely very cold, windy, or hot weather will weaken the snowpack.
 
At temperatures close to the freezing point of water, or during times of moderate solar radiation, a gentle freeze-thaw cycle will take place. The melting and refreezing of water in the snow strengthens the snowpack during the freezing phase and weakens it during the thawing phase. A rapid rise in temperature, to a point significantly above the freezing point of water, may cause avalanche formation at any time of year.
 
Persistent cold temperatures can either prevent new snow from stabilizing or destabilize the existing snowpack. Cold air temperatures on the snow surface produce a temperature gradient in the snow, because the ground temperature at the base of the snowpack is usually around °C, and the ambient air temperature can be much colder. When a temperature gradient greater than 10&nbsp;°C change per vertical meter of snow is sustained for more than a day, angular crystals called [[depth hoar]] or facets begin forming in the snowpack because of rapid moisture transport along the temperature gradient. These angular crystals, which bond poorly to one another and the surrounding snow, often become a persistent weakness in the snowpack. When a slab lying on top of a persistent weakness is loaded by a force greater than the strength of the slab and persistent weak layer, the persistent weak layer can fail and generate an avalanche.
 
Any wind stronger than a light breeze can contribute to a rapid accumulation of snow on sheltered slopes downwind. Wind slab forms quickly and, if present, weaker snow below the slab may not have time to adjust to the new load. Even on a clear day, wind can quickly load a slope with snow by blowing snow from one place to another. Top-loading occurs when wind deposits snow from the top of a slope; cross-loading occurs when wind deposits snow parallel to the slope. When a wind blows over the top of a mountain, the leeward, or downwind, side of the mountain experiences top-loading, from the top to the bottom of that lee slope. When the wind blows across a ridge that leads up the mountain, the leeward side of the ridge is subject to cross-loading. Cross-loaded wind-slabs are usually difficult to identify visually.
 
Snowstorms and rainstorms are important contributors to avalanche danger. Heavy snowfall will cause instability in the existing snowpack, both because of the additional weight and because the new snow has insufficient time to bond to underlying snow layers. Rain has a similar effect. In the short-term, rain causes instability because, like a heavy snowfall, it imposes an additional load on the snowpack; and, once rainwater seeps down through the snow, it acts as a lubricant, reducing the natural friction between snow layers that holds the snowpack together. Most avalanches happen during or soon after a storm.
 
Daytime exposure to sunlight will rapidly destabilize the upper layers of the snowpack if the sunlight is strong enough to melt the snow, thereby reducing its hardness. During clear nights, the snowpack can re-freeze when ambient air temperatures fall below freezing, through the process of long-wave radiative cooling, or both. Radiative heat loss occurs when the night air is significantly cooler than the snowpack, and the heat stored in the snow is re-radiated into the atmosphere.
 
==Dynamics==
When a slab avalanche forms, the slab disintegrates into increasingly smaller fragments as the snow travels downhill. If the fragments become small enough the outer layer of the avalanche, called a saltation layer, takes on the characteristics of a [[fluid]]. When sufficiently fine particles are present they can become airborne and, given a sufficient quantity of airborne snow, this portion of the avalanche can become separated from the bulk of the avalanche and travel a greater distance as a powder snow avalanche.<ref>[http://www.leeds.ac.uk/satsie/docs/final_report.pdf SATSIE Final Report (large PDF file - 33.1 Mb)], page 94, October 1, 2005 to May 31, 2006</ref> Scientific studies using [[radar]], following the 1999 [[Galtür Avalanche|Galtür avalanche disaster]], confirmed the hypothesis that a [[Saltation (geology)|saltation layer]] forms between the surface and the airborne components of an avalanche, which can also separate from the bulk of the avalanche.<ref>[http://www.bbc.co.uk/science/horizon/1999/avalanche_script.shtml Horizon: Anatomy of an Avalanche], ''[[BBC]]', 1999-11-25</ref>
 
Driving an avalanche is the component of the avalanche's weight parallel to the slope; as the avalanche progresses any unstable snow in its path will tend to become incorporated, so increasing the overall weight. This force will increase as the steepness of the slope increases, and diminish as the slope flattens. Resisting this are a number of components that are thought to interact with each other: the friction between the avalanche and the surface beneath; friction between the air and snow within the fluid; fluid-dynamic drag at the leading edge of the avalanche; shear resistance between the avalanche and the air through which it is passing, and shear resistance between the fragments within the avalanche itself. An avalanche will continue to accelerate until the resistance exceeds the forward force.<ref>[http://www.avalanche.org/~moonstone/zoning/avalanche%20dynamics.htm Avalanche Dynamics], Art Mears, 2002-07-11</ref>
 
===Modelling===
Attempts to model avalanche behaviour date from the early 20th century, notably the work of Professor Lagotala in preparation for the [[1924 Winter Olympics]] in [[Chamonix]].<ref name=Ancey>[http://lhe.epfl.ch/pdf/snow-avalanche.pdf Snow Avalanches], Christophe Ancey</ref> His method was developed by A. Voellmy and popularised following the publication in 1955 of his ''Ueber die Zerstoerungskraft von Lawinen'' (On the Destructive Force of Avalanches).<ref>VOELLMY, A., 1955. ''Ober die Zerstorunskraft von Lawinen''. Schweizerische Bauzetung (English: ''On the Destructive Force of Avalanches''. U.S. Dept. of Agriculture, Forest Service).</ref>
 
Voellmy used a simple empirical formula, treating an avalanche as a sliding block of snow moving with a drag force that was proportional to the square of the speed of its flow:<ref>[http://www.grenoble.cemagref.fr/etna/resultats/program_region/BERTHETRAMBAUDPGRN.pdf Quantification de la sollicitation structures métaliques avalancheuse par analyse en retour du comportement de structures métallliques], page 14, ''Pôle Grenoblois d’études et de recherche
pour la Prévention des risques naturels'', October 2003, in French</ref>
 
::<math> \textrm{Pref} = \frac {1} {2} \, { \rho} \, { v^2} \,\!</math>
 
He and others subsequently derived other formulae that take other factors into account, with the Voellmy-Salm-Gubler and the Perla-Cheng-McClung models becoming most widely used as simple tools to model flowing (as opposed to powder snow) avalanches.<ref name=Ancey/>
 
Since the 1990s many more sophisticated models have been developed. In Europe much of the recent work was carried out as part of the SATSIE (Avalanche Studies and Model Validation in Europe) research project supported by the [[European Commission]]<ref>[http://www.leeds.ac.uk/satsie/ SATSIE - Avalanche Studies and Model Validation in Europe]</ref> which produced the leading-edge MN2L model, now in use with the ''Service Réstitution Terrains en Montagne'' (Mountain Rescue Service) in
France, and D2FRAM (Dynamical Two-Flow-Regime Avalanche Model), which was still undergoing validation as of 2007.<ref>[http://www.leeds.ac.uk/satsie/docs/final_report.pdf SATSIE Final Report (large PDF file - 33.1 Mb)], October 1, 2005 to May 31, 2006</ref>
 
==Human involvement==
[[File:Avalanche warning in Tuckerman.JPG|thumb|right|250px|[[United States Forest Service]] avalanche danger advisories.]]
[[File:Verbauung Tanngrindel.JPG|right|thumb|250px|[[Snow fence]]s in [[Switzerland]]]]
[[File:Avalanche Blasting.jpg|250px|thumb|Avalanche blasting in French [[ski resort]] [[Tignes]] (3,600 m)]]
 
===Prevention===
{{main|Avalanche control}}
Preventative measures are employed in areas where avalanches pose a significant threat to people, such as [[ski resort]]s and mountain towns, roads and railways. There are several ways to prevent avalanches and lessen their power and destruction; active preventative measures reduce the likelihood and size of avalanches by disrupting the structure of the snowpack; passive measures reinforce and stabilize the snowpack in situ. The simplest active measure is by repeatedly traveling on a snowpack as snow accumulates; this can be by means of boot-packing, ski-cutting, or [[Snow grooming|machine grooming]]. [[Explosive]]s are used extensively to prevent avalanches, by triggering smaller avalanches that break down instabilities in the snowpack, and removing over burden that can result in larger avalanches. Explosive charges are delivered by a number of methods including hand tossed charges, helicopter dropped bombs, Gazex concussion lines, and ballistic projectiles launched by air cannons and artillery. Passive preventive systems such as [[Snow fence]]s and light walls can be used to direct the placement of snow. Snow builds up around the fence, especially the side that faces the prevailing [[wind]]s. Downwind of the fence, snow buildup is lessened. This is caused by the loss of snow at the fence that would have been deposited and the pickup of the snow that is already there by the wind, which was depleted of snow at the fence. When there is a sufficient density of [[tree]]s, they can greatly reduce the strength of avalanches. They hold snow in place and when there is an avalanche, the impact of the snow against the trees slows it down. Trees can either be planted or they can be conserved, such as in the building of a ski resort, to reduce the strength of avalanches.
 
===Mitigation===
 
In many areas, regular avalanche tracks can be identified and precautions can be taken to minimise damage, such as the prevention of development in these areas. To mitigate the effect of avalanches the construction of artificial barriers can be very effective in reducing avalanche damage. There are several types: One kind of barrier ([[snow net]]) uses a net strung between poles that are anchored by [[guy wire]]s in addition to their foundations. These barriers are similar to those used for [[rockslide]]s. Another type of barrier is a rigid fence-like structure ([[snow fence]]) and may be constructed of [[steel]], [[wood]] or pre-stressed [[concrete]]. They usually have gaps between the beams and are built perpendicular to the slope, with reinforcing beams on the downhill side. Rigid barriers are often considered unsightly, especially when many rows must be built. They are also expensive and vulnerable to damage from falling rocks in the warmer months. In addition to industrially manufactured barriers, landscaped barriers, called [[avalanche dam]]s stop or deflect avalanches with their weight and strength. These barriers are made out of concrete, rocks or earth. They are usually placed right above the structure, road or railway that they are trying to protect, although they can also be used to channel avalanches into other barriers. Occasionally, [[earth mound]]s are placed in the avalanche's path to slow it down. Finally, along transportation corridors, large shelters, called [[snow shed]]s, can be built directly in the slide path of an avalanche to protect traffic from avalanches.
 
===Survival, rescue, and recovery===
 
Avalanche accidents are broadly differentiated into 2 categories: accidents in recreational settings, and accidents in residential, industrial, and transportation settings. This distinction is motivated by the observed difference in the causes of avalanche accidents in the two settings. In the recreational setting most accidents are caused by the people involved in the avalanche. In a 1996 study, Jamieson et al. (pages 7–20)<ref name="Jamieson 1996">{{cite web|last=Jamieson|first=Bruce|title=Avalanche Accidents in Canada Volume 4: 1984-1996|url=http://avalancheinfo.net/Newsletters%20and%20Articles/Articles/AvalancheAccidentsV4.pdf|publisher=Canadian Avalanche Association|accessdate=7 March 2013|coauthors=Torsten Geldstzer}}</ref> found that 83% of all avalanches in the recreational setting were caused by those who were involved in the accident. In contrast, all of the accidents in the residential, industrial, and transportation settings were due to spontaneous natural avalanches. Because of the difference in the causes of avalanche accidents, and the activities pursued in the two settings, avalanche and disaster management professionals have developed two related preparedness, rescue, and recovery strategies for each of the settings.
{{Main|Avalanche rescue}}
 
==Notable avalanches==
{{see also|List of avalanches}}
Two avalanches occurred in March 1910 in the Cascade and Selkirk Mountain ranges; On March 1 the [[Wellington avalanche]] killed 96 in [[Washington (U.S. state)|Washington State]], United States. Three days later 62 railroad workers were killed in the [[Rogers Pass avalanche]] in [[British Columbia]], Canada.
 
During [[World War I]], an estimated 40,000 to 80,000 soldiers died as a result of avalanches during the mountain campaign in the [[Alps]] at the [[Italian Campaign (World War I)|Austrian-Italian]] front, many of which were caused by [[artillery]] fire.<ref>Lee Davis (2008). "''[http://books.google.com/books?id=CRzMOYIuLJEC&pg=&dq&hl=en#v=onepage&q=&f=false Natural Disasters]''". Infobase Publishing. p.7. ISBN 0-8160-7000-8</ref><ref>Eduard Rabofsky et al., Lawininenhandbuch, Innsbruck, Verlaganstalt Tyrolia, 1986, p. 11</ref> Some 10,000 men, from both sides, lost their lives in avalanches in December 1916.<ref>[http://www.history.com/this-day-in-history/soldiers-perish-in-avalanche-as-world-war-i-rages History Channel - December 13, 1916: Soldiers perish in avalanche as World War I rages]</ref>
 
In the [[northern hemisphere]] winter of 1950–1951 approximately 649 avalanches were recorded in a three-month period throughout the [[Alps]] in Austria, France, Switzerland, Italy and Germany. This series of avalanches killed around 265 people and was termed the [[Winter of Terror (1951)|Winter of Terror]].
 
A mountain climbing camp on Lenin Peak, in what is now Kyrgyzstan, was wiped out in 1990 when an earthquake triggered a large avalanche that overran the camp.<ref>{{cite news| url=http://www.nytimes.com/1990/07/18/world/avalanche-kills-40-climbers-in-soviet-central-asia.html | work=The New York Times | first=Francis X. | last=Clines | title=Avalanche Kills 40 Climbers in Soviet Central Asia | date=July 18, 1990}}</ref>
Forty-three climbers were killed.<ref>{{cite web|url=http://www.centralasia-travel.com/en/expeditions/lenin/history/ |title=Lenin Peak. Historical background of Lenin Peak. The first expedition to Lenin Peak |publisher=Centralasia-travel.com |date= |accessdate=2013-06-21}}</ref>
 
In 1993, the [[1993 Bayburt Üzengili avalanche|Bayburt Üzengili avalanche]] killed 60 individuals in Üzengili in the province of [[Bayburt]], [[Turkey]].
 
A large avalanche in [[Montroc, France]], in 1999, 300,000&nbsp;cubic metres of snow slid on a 30° slope, achieving a speed of 100&nbsp;km/h (60&nbsp;mph). It killed 12 people in their chalets under 100,000&nbsp;tons of snow, 5&nbsp;meters (15&nbsp;ft) deep. The mayor of [[Chamonix]] was convicted of second-degree murder for not evacuating the area, but received a suspended sentence.<ref>[http://www.pistehors.com/backcountry/wiki/Articles/Montroc-Avalanche PisteHors.com: Montroc Avalanche]</ref>
 
The small Austrian village of [[Galtür]] was hit by the [[Galtür Avalanche|Galtür avalanche]] in 1999. The village was thought to be in a safe zone but the avalanche was exceptionally large and flowed into the village. Thirty-one people died.
 
An [[2012 Siachen Glacier avalanche|avalanche]] in the [[Siachen glacier]] in the [[Himalaya mountains]] buried at least 124 Pakistani soldiers and 11 civilians in April 2012.<ref>{{cite news| url=http://www.bbc.co.uk/news/world-asia-17644251 | work=BBC News | title=Pakistan avalanche: 'We are keeping our fingers crossed' | date=April 7, 2012}}</ref>
 
An avalanche on [[Manaslu]], in the Himalaya mountains, overwhelmed camp 3, early in morning of September 23, 2012 killing 11 climbers, and skiers.<ref>{{cite web|last=Hill|first=Greg|title=Disaster Strikes on Manaslu|url=http://www.greghill.ca/pages/disaster-strikes-on-manaslu/|accessdate=7 March 2013}}</ref>
 
 
The [[2012 Tunnel Creek avalanche]] occurred on February 19, 2012 in the Tunnel Creek section of Stevens Pass, a mountain pass through the Cascade Mountains located at the border of King County and Chelan County in Washington, United States.[1]
 
==Classification==
===European avalanche risk table===
In [[Europe]], the avalanche risk is widely rated on the following scale, which was adopted in April 1993 to replace the earlier non-standard national schemes. Descriptions were last updated in May 2003 to enhance uniformity.<ref>[http://www.slf.ch/laworg/muenchen2003-fr.pdf ]{{dead link|date=June 2013}}</ref>
 
In France, most avalanche deaths occur at risk levels 3 and 4. In Switzerland most occur at levels 2 and 3. It is thought that this may be due to national differences of interpretation when assessing the risks.<ref>''[http://skirando.com/images/avalanche/avalanche-accidents-2006.pdf An Analysis of French Avalanche Accidents for 2005-2006]''</ref>
 
{| class="wikitable"
|-
! style="width:10%;"|Risk Level
! style="width:25%;"|Snow Stability
! style="width:10%;"|Flag
! style="width:55%;"|Avalanche Risk
|-
|1 - Low
|Snow is generally very stable.
| style="text-align:center;"| [[File:Avalanche-risk-1-2.svg|64px]]
|Avalanches are unlikely except when heavy loads are applied on a very few extreme steep slopes. Any spontaneous avalanches will be minor sloughs. In general, safe conditions.
|-
|2 - Limited
|On some steep slopes the snow is only moderately stable. Elsewhere it is very stable.
| style="text-align:center;"| [[File:Avalanche-risk-1-2.svg|64px]]
|Avalanches may be triggered when heavy loads are applied, especially on a few generally identified steep slopes. Large spontaneous avalanches are not expected.
|-
|3 - Medium
|On many steep slopes the snow is only moderately or weakly stable.
| style="text-align:center;"| [[File:Avalanche-risk.svg|64px]]
|Avalanches may be triggered on many slopes even if only light loads are applied. On some slopes, medium or even fairly large spontaneous avalanches may occur.
|-
|4 - High
|On most steep slopes the snow is not very stable.
| style="text-align:center;"| [[File:Avalanche-risk.svg|64px]]
|Avalanches are likely to be triggered on many slopes even if only light loads are applied. In some places, many medium or sometimes large spontaneous avalanches are likely.
|-
|5 - Very High
|The snow is generally unstable.
| style="text-align:center;"| [[File:Avalanche-risk-5.svg|64px]]
|Even on gentle slopes, many large spontaneous avalanches are likely to occur.
|}
 
'''[1] Stability:'''
*Generally described in more detail in the avalanche bulletin (regarding the altitude, aspect, type of terrain etc.)
 
'''[2] additional load:'''
*heavy: two or more skiers or boarders without spacing between them, a single [[hiking|hiker]] or [[climbing|climber]], a grooming machine, avalanche blasting
*light: a single skier or snowboarder smoothly linking turns and without falling, a group of skiers or snowboarders with a minimum 10&nbsp;m gap between each person, a single person on [[snowshoe]]s
'''Gradient:'''
*gentle slopes: with an incline below about 30°
*steep slopes: with an incline over 30°
*very steep slopes: with an incline over 35°
*extremely steep slopes: extreme in terms of the incline (over 40°), the terrain profile, proximity of the ridge, smoothness of underlying ground
 
===European avalanche size table===
'''Avalanche size:'''
{| class="wikitable"
|-
! style="width:10%;"|Size
! style="width:35%;"|Runout
! style="width:35%;"|Potential Damage
! style="width:20%;"|Physical Size
|-
|1 - Sluff
|Small snow slide that cannot bury a person, though there is a danger of falling.
|Unlikely, but possible risk of injury or death to people.
|length <50&nbsp;m <br>volume <100&nbsp;m³
|-
|2 - Small
|Stops within the slope.
|Could bury, injure or kill a person.
|length <100&nbsp;m <br>volume <1,000&nbsp;m³
|-
|3 - Medium
|Runs to the bottom of the slope.
|Could bury and destroy a car, damage a truck, destroy small buildings or break trees.
|length <1,000&nbsp;m <br>volume <10,000&nbsp;m³
|-
|4 - Large
|Runs over flat areas (significantly less than 30°) of at least 50&nbsp;m in length, may reach the valley bottom.
|Could bury and destroy large trucks and trains, large buildings and forested areas.
|length >1,000&nbsp;m <br>volume >10,000&nbsp;m³
|}
 
===North American Avalanche Danger Scale===
[[File:Danger Scale - English.jpg|thumb|right|Danger Scale - English]]In the [[United States]] and [[Canada]], the following avalanche danger scale is used. Descriptors vary depending on country.
 
===Canadian classification for avalanche size===
The Canadian classification for avalanche size is based upon the consequences of the avalanche. Half sizes are commonly used.<ref name = "backcountryavalancheawareness" />
{| class="wikitable"
|-
! style="width:5%;"|Size
! style="width:95%;"|Destructive Potential
|-
|1
|Relatively harmless to people.
|-
|2
|Could bury, injure or kill a person.
|-
|3
|Could bury and destroy a car, damage a truck, destroy a small building or break a few trees.
|-
|4
|Could destroy a railway car, large truck, several buildings or a forest area up to 4&nbsp;hectares.
|-
|5
|Largest snow avalanche known. Could destroy a village or a forest of 40&nbsp;hectares.
|}
 
===United States classification for avalanche size===
{| class="wikitable"
|-
! style="width:5%;"|Size
! style="width:95%;"|Destructive Potential<ref name="backcountryavalancheawareness">{{cite book
  | last = Jamieson
  | first = Bruce
  | title = Backcountry Avalanche Awareness
  | publisher = [[Canadian Avalanche Association]]
  | year = 2000
  | isbn = 0-9685856-1-2}}
</ref>
|-
|1
|Sluff or snow that slides less than 50m (150') of slope distance.
|-
|2
|Small, relative to path.
|-
|3
|Medium, relative to path.
|-
|4
|Large, relative to path.
|-
|5
|Major or maximum, relative to path.
|}
 
===Rutschblock Test===
Slab avalanche hazard analysis can be done using the Rutschblock Test. A 2&nbsp;m wide block of snow is isolated from the rest of the slope and progressively loaded. The result is a rating of slope stability on a seven step scale.<ref name="Abromelt">{{cite web | url        =http://www.fsavalanche.org/Default.aspx?ContentId=23&LinkId=28&ParentLinkId=3 | title      =Learn how to: Perform A Rutschblock Test | author    =Doug Abromelt and Greg Johnson | date      =winter, 2011-2012 | work      = | publisher  =USFS National Avalanche Center | accessdate =2012-11-28 }}</ref>
 
==See also==
===Related flows===
*[[Debris flow]]
*[[Gravity current]]
*[[Lahar]]
*[[Landslide]]
*[[Mudflow]]
*[[Pyroclastic flow]]
*[[Slush flow]]
 
===Famous avalanche disasters===
*[[Galtür Avalanche]]
*[[Montroc]]
*[[2012 Siachen Glacier avalanche|Siachen Glacier]]
 
==References==
===Bibliography===
*McClung, David. ''Snow Avalanches as a Non-critical, Punctuated Equilibrium System'': Chapter 24 in Nonlinear Dynamics in Geosciences, A.A. Tsonsis and J.B Elsner (Eds.), Springer, 2007
*''[[Mark the Mountain Guide: Avalanche!]]'': a children's book about an avalanche that includes definitions & explanations of the phenomenon
*Daffern, Tony: ''Avalanche Safety for Skiers, Climbers and Snowboarders'', Rocky Mountain Books, 1999, ISBN 0-921102-72-0
*Billman, John. "Mike Elggren on Surviving an Avalanche". ''Skiing'' magazine Feb 2007: 26.
*McClung, David and Shaerer, Peter: ''The Avalanche Handbook'', The Mountaineers: 2006. 978-0-89886-809-8
*Tremper, Bruce: ''Staying Alive in Avalanche Terrain'', The Mountaineers: 2001. ISBN 0-89886-834-3
*Munter, Werner: ''Drei mal drei (3x3) Lawinen. Risikomanagement im Wintersport'', [[Bergverlag Rother]], 2002. ISBN 3-7633-2060-1 {{de icon}} (partial English translation included in ''PowderGuide: Managing Avalanche Risk'' ISBN 0-9724827-3-3)
*Michael Falser: ''Historische Lawinenschutzlandschaften: eine Aufgabe für die Kulturlandschafts- und Denkmalpflege'' In: kunsttexte 3/2010, unter: http://edoc.hu-berlin.de/kunsttexte/2010-3/falser-michael-1/PDF/falser.pdf
 
===Notes===
{{reflist}}
 
==External links==
{{Sisterlinks|Avalanche}}
{{Commons|Avalanche chute}}
*[http://www.virtualmountains.ca The Avalanche Education Project]
*[http://www.edu4hazards.org/avalanche.html Surviving an Avalanche - A guide for children and youth]
*[http://nsidc.org/snow/avalanche/ Avalanche Awareness]
*[http://www.fao.org/DOCREP/006/AD075E/AD075e09.htm Avalanche Defense Photographs]
*[http://www.avalanche.ca Canadian Avalanche Association]
*[http://archives.cbc.ca/IDD-1-75-1483/science_technology/avalanches/ CBC Digital Archives – Avalanche!]
*[http://avalanche.state.co.us/ Colorado Avalanche Information Center]
*[http://www.snowstudies.org/ Center for Snow and Avalanche Studies]
*[http://www.slf.ch/laworg/map.html Directory of European avalanche services]
*[http://www.slf.ch/welcome-en.html Swiss Federal Institute for Snow and Avalanche Research]
*[http://www.sais.gov.uk/ sportscotland Avalanche Information Service]
*{{Cite EB1911|wstitle=Avalanche}} But note the myths cited above
*[http://monosar.org/avalanche_safety/article_avalanche_study_mccammon_human_factors_traps.pdf Evidence of heuristic traps in recreational avalanche accidents] by [[Ian McCammon]], [[National Outdoor Leadership School]], [[Lander, WY]], USA
*[http://utahavalanchecenter.org/ Utah Avalanche Center]
*[http://www.avalanche.net.nz/ New Zealand Avalanche Centre]
*[http://gulmargavalanche.org/ Gulmarg Avalanche Center]
*[http://www.avalanche.org/ US Avalanche.org]
*[http://www.sierraavalanchecenter.org/ Sierra Avalanche Center (Tahoe National Forest)]
{{Natural disasters}}
 
[[Category:Geological hazards]]
[[Category:Weather hazards]]
[[Category:Snow]]
[[Category:Avalanches| ]]
[[Category:Geology articles needing expert attention]]

Latest revision as of 04:49, 8 January 2015

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