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- Dictionaryavalanche/ˈavəlɑːn(t)ʃ/
noun
- 1. a mass of snow, ice, and rocks falling rapidly down a mountainside: "he was swept to his death by an avalanche in 1988" Similar
- 2. a sudden arrival or occurrence of something in overwhelming quantities: "we have had an avalanche of applications for the post" Similar Opposite
verb
- 1. (of a mass of snow, ice, etc.) descend rapidly down a mountainside.
- 2. undergo a rapid increase in conductivity due to an avalanche process.
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Learn the meaning of avalanche as a noun, with synonyms, related words, and usage examples. An avalanche is a large amount of ice, snow, and rock falling down a mountain, or a sudden arrival of too many things.
- English (US)
AVALANCHE meaning: 1. a large amount of ice, snow, and rock...
- Znaczenie Avalanche, Definicja W Cambridge English Dictionary
AVALANCHE definicja: 1. a large amount of ice, snow, and...
- Avalanche in Spanish
AVALANCHE translate: avalancha, avalancha, avalancha. Learn...
- Avalanche in Arabic
AVALANCHE translate: جُرف ثَلجي / انْهيار جَليدي. Learn more...
- Avalanche in French
avalanche translate: avalanche. Learn more in the Cambridge...
- Avalanche in Polish
avalanche translate: lawina, lawina. Learn more in the...
- Avalanche: Catalan Translation
avalanche translate: allau. Learn more in the Cambridge...
- Avalanche: Thai Translation
avalanche translate: หิมะถล่ม. Learn more in the Cambridge...
- English (US)
- Overview
- Avalanche conditions
- Prediction and protective measures
An avalanche is a mass of material rapidly moving down a slope. It is typically triggered when the material on a slope breaks loose from its surroundings, and this material quickly collects and carries additional material down the slope.
What are the different kinds of avalanches?
The various kinds of avalanches include snow avalanches, rock avalanches, ice avalanches (which typically occur in the vicinity of a glacier), and debris avalanches (which contain a variety of unconsolidated materials, such as loose stones and soil).
What causes an avalanche?
The occurrence of an avalanche depends on the interaction of mountainous terrain, weather conditions, snowpack conditions, and a trigger. The probability of avalanches may be increased or decreased by several other terrain features, such as slope shape, a slope’s exposure to sun and wind, and elevation.
Can people cause avalanches?
The occurrence of an avalanche depends on the interaction of mountainous terrain, weather conditions, snowpack conditions, and a trigger. Slab avalanches typically occur on slopes of 30 to 50 degrees. On slopes that are less steep, there is generally insufficient gravitational force to overcome frictional resistance and cause the displacement of a snow slab; on steeper slopes snow tends to sluff off. However, slab avalanches do occur on steeper slopes in climates with dense, wet snowfall. An important feature of terrain that can lead to an avalanche is the lack of objects that serve to anchor the snow, such as trees. Slab avalanches will not occur on slopes with sufficiently dense tree cover, which is about 1,000 conifer trees per hectare (400 per acre) on steep slopes and about half that density on gentler slopes. Other objects that can anchor the snow are large exposed rock outcroppings and rocks that are large enough to stick up through the snow cover. The probability of avalanches may be increased or decreased by several other terrain features, such as slope shape, a slope’s exposure to sun and wind, and elevation.
Certain types of weather lead directly to dangerous avalanche conditions—that is, to a high risk that an avalanche will occur. Slab avalanches are commonly associated with heavy snowfall and strong wind. With heavy snowfall, weaknesses in the existing snowpack may become overloaded, and the snow may fall so quickly that the new snow is unable to bond to the snow beneath it. Strong wind tends to break down the snow into ice crystals that readily bond together into a slab, and it also transports snow onto the lee sides of ridges and gullies, where wind-loaded snow leads to more frequent avalanching. Other meteorological conditions that can quickly lead to dangerous avalanche conditions are rapidly rising air temperature and rainfall on existing snow cover.
A snowpack consists of layers of snow, each formed at different times. Once the snow is on the ground, the ice crystals undergo physical changes that differentiate the layers deeper in the snowpack from those on top. These changes can weaken a layer underlying a cohesive slab of snow and thereby help set up a slab avalanche.
Once the conditions for an avalanche exist, a trigger simply applies sufficient force to release it. Natural triggers include new snowfall, wind-deposited snow, and a falling cornice (an overhanging mass of windblown ice or snow extending from a ridge). Other triggers include skiers, snowmobilers, snowboarders, and explosive blasts. Contrary to popular belief, noises such as yelling, yodeling, or the sound of a snowmobile will not trigger avalanches. Research has shown that only the loudest sonic booms under the most sensitive avalanche conditions might be able to trigger a slide.
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In order to reduce fatalities and to protect villages and roads, people attempt to predict and prevent avalanches. Accurate avalanche prediction requires an experienced avalanche forecaster who often works both in the field to gather snowpack information and in the office with sophisticated tools such as remotely accessed weather data, detailed historical weather and avalanche databases, weather models, and avalanche-forecasting models. Avalanche forecasters combine their historical knowledge of past conditions with their knowledge of the affected terrain, current weather, and current snowpack conditions to predict when and where avalanches are most likely to occur. Such forecasting work typically takes place along mountain highways, adjacent to potentially affected villages, at ski areas, and in terrain heavily used for backcountry skiing and snowmobiling.
In addition to predicting avalanches, people employ a variety of techniques to reduce avalanche danger. Explosives are used to trigger avalanches on potentially unstable slopes so that the avalanches will occur when people are not endangered. Such avalanche control is particularly effective for ski areas and highway corridors. In some areas prone to avalanches, particularly near villages and fixed structures, devices such as avalanche rakes (large reinforced fencing) are used on slopes to hold snow in place, and diversion structures such as dams or wedges are used at the base of the slope to stop, split, or deflect the snow in an avalanche. Though expensive, these defensive measures are common throughout the Alps, where numerous villages are found in areas known for dangerous avalanches.
An avalanche is a rapid flow of snow down a slope, triggered by various factors such as weather, snowpack, or external events. Learn about the formation, dynamics, classification, and human involvement of avalanches, as well as their impacts on life and property.
Learn the meaning of avalanche as a noun and a verb, with examples of usage and word history. Find synonyms, antonyms, translations, and related words for avalanche.
An avalanche is a mass of snow, rock, ice, and soil that slides down a mountain. Learn about the types, causes, dangers, and control of avalanches, and see photos and videos of them.
Learn the meaning of avalanche as a noun, with synonyms, related words, and usage examples. An avalanche is a large amount of ice, snow, and rock falling down a mountain, or a sudden arrival of too many things.
Learn the meaning of avalanche as a noun and a verb, with synonyms and related terms. Find out the origin and usage of the word avalanche in different contexts, such as geology, physics and literature.
