Vriesvorming

Vriesvorming, also known as rime ice, is a type of ice accretion that occurs when supercooled water droplets in fog or clouds freeze upon contact with a surface. This phenomenon is common in cold, humid conditions, particularly at higher altitudes or in mountainous regions. The ice crystals that form during rime are typically granular and opaque, giving it a frosted appearance.

There are several types of vriesvorming, classified based on the conditions under which they form and the resulting structure of the ice. Clear ice, also known as glaze ice, forms when larger supercooled water droplets freeze slowly on impact, creating a smooth, transparent layer of ice. Rime ice, on the other hand, forms when smaller droplets freeze rapidly, trapping air and resulting in a milky, opaque deposit. Soft rime is characterized by its feathery, porous structure, while hard rime is denser and more crystalline.

Vriesvorming can have significant impacts on various sectors. In aviation, it can lead to a loss of lift and control, posing a serious hazard to aircraft. On the ground, it can accumulate on power lines, bridges, and buildings, causing structural damage. In meteorology, the formation of rime ice is an indicator of specific atmospheric conditions, including the presence of supercooled water and sub-freezing temperatures. Understanding the processes behind vriesvorming is crucial for forecasting and mitigating its potential risks.