Avalanche

Avalanche is a natural phenomenon that typically occurs in mountainous, sloped areas lacking plant cover, resulting from the sliding of snow layers under the influence of internal and external forces. This event can also be described as the sliding of snow layers over one another or complete detachment from the ground on due to the accumulation of heavy snowfall. Avalanches are commonly observed on sloped terrain in mountainous regions, especially along valley slopes. Mountains provide environments where snow accumulations can rapidly build up. Over time, snow layers begin to slide under specific loading and external forces, accelerating rapidly downhill. This movement can lead to severe can and goods losses, as the speed of the avalanche mass is extremely high and it can spread over wide areas, destroying everything in its path.

Conditions Required for Avalanche Formation

The two most critical factors in avalanche formation are topographical conditions and meteorological elements. Northern, northeastern and east regions of Türkiye possess mountainous areas with topographical features conducive to such natural disasters, resulting in a high avalanche risk. Avalanches are particularly common at elevations above 1000 meters. These high-altitude regions are prone to frequent avalanches because most precipitation falls as snow and microclimates develop, facilitating snow accumulation. Additionally, these areas experience wind-driven redistribution and re-accumulation of snow, which contributes to the rapid growth of avalanches.

Avalanche (Source: Outdoor News)

Meteorological Conditions

The most important meteorological factors contributing to avalanche formation include precipitation, wind, temperature fluctuations and atmosphere conditions place. Heavy snowfall can cause rapid accumulation of snow layers, leading to sliding under gravity. Additionally, wind can transport snow to specific areas, creating large snow deposits that increase avalanche risk. Another triggering factor is temperature change. Sudden drops in temperature following warm periods cause snow to melt and then refreeze, disrupting the stability of snow layers and initiating avalanches. Rain precipitation adds weight to the snowpack by increasing its density and can initiate sliding motion.

Avalanche Events and Impacts in Türkiye

Türkiye is frequently affected by avalanche disasters due to its mountainous terrain and climatic characteristics. The northeastern and eastern regions of the country, with their high mountain ranges and valley slopes, are particularly susceptible to avalanches. Especially the interior areas of Black Sea Region, the Eastern Anatolia and Southeastern Anatolia regions experience frequent avalanche events. Avalanches threaten settlements, roads and tourist facilities in these areas and can cause significant material losses. Moreover, loss of life due to avalanches remains a major concern. For example, during the 1991–1992 winter avalanche disaster, 328 people lost their lives. The social impacts of such disasters are also substantial; displaced populations may be forced to abandon damage affected settlements and migration local economies can suffer negative consequences. The economic impact of avalanches becomes even more pronounced when damage is not properly assessed and production losses increase.

Types of Avalanches

Avalanches can be classified into different types based on their structure. Dry snow avalanches are the most common type and typically occur during windy conditions. These avalanches consist of snow particles forming a powder-like cloud that can reach speeds of up to 400 km per hour. Dry snow avalanches generate large atmospheric pressure and can cause extensive harm to surrounding areas. Slab avalanches occur when hardened and compacted snow layers slide over one another. These are often triggered by wind or other external factors. Wet snow avalanches form from moist and older snow layers and typically occur toward the end of winter. These type avalanches move as heavy, massive masses.

Avalanche Protection Methods

Both passive and active methods can be employed to protect against avalanches. Passive measures include avoiding the establishment of new settlements in avalanche-prone areas, preserving forests and vegetation, and constructing avalanche tunnels and barriers. Active protective measures involve compacting snow layers, triggering artificial avalanches and altering the slope gradients of hazardous areas. These measures can help prevent avalanche formation and mitigate the occurrence of major disasters.

Actions to Take If Caught in an Avalanche

An avalanche develops suddenly and unpredictably, so maintaining calm when caught in one is vital importance. If you are outdoors, immediately attempt to move quickly toward safer ground. If skiing, remove your skis and try to grasp a rock or tree. Additionally, perform swimming motions to help stay on the surface and avoid being buried. It is also important to create an air pocket to increase your chances of survival. If possible during the avalanche, shout to alert others nearby and call for help. If you are inside a vehicle, turn off the engine and remain inside; audible and visual signals from outside may provide a chance for rescue.

First Aid After an Avalanche

Proper procedures must be followed when assisting victims after an avalanche. First, an emergency call must be made to the 112 Emergency Services line and rescue teams must be directed to the avalanche zone as quickly as possible. When administering first aid, it is essential to consider potential fractures in the neck and belt spine. Victims buried under snow may require immediate warming and fluid replacement oxygen.

Avalanche is a natural phenomenon occurring in mountainous areas that can rapidly cause extensive damage. However, with appropriate preventive measures, avalanche disasters can be avoided or their impacts minimized. Increasing public awareness and ensuring local authorities are prepared for such disasters is of great importance.