zastruga - определение. Что такое zastruga
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Что (кто) такое zastruga - определение

SHARP IRREGULAR GROOVES OR RIDGES FORMED ON A SNOW SURFACE
Sastrugus; Sastruga; Zastrugi; Zastruga
  • Wind sculpted snow near South Pole Station, forming sastrugi features.
  • Large sastrugi seen in radar image around the south edge (left side) of [[Lake Vostok]] in Antarctica ([[RADARSAT]], [[NASA]]). White and black colors on sastrugi are not lights and shadows, they demonstrate difference in radioreflectivity of snow deposits on the windward and leeward sides of a sastruga.

Zastruga         
·add. ·pl of Zastrugi.
sastrugi         
[sa'stru:gi]
¦ plural noun parallel wave-like ridges caused by winds on the surface of hard snow.
Origin
C19: from Russ. zastrugi 'small ridges'.
Zastrugi         
·add. ·noun ·pl Grooves or furrows formed in snow by the action of the wind, and running parallel with the direction of the wind. This formation results from the erosion of transverse waves previously formed.

Википедия

Sastrugi

Sastrugi, or zastrugi, are features formed by erosion of snow by wind. They are found in polar regions, and in snowy, wind-swept areas of temperate regions, such as frozen lakes or mountain ridges. Sastrugi are distinguished by upwind-facing points, resembling anvils, which move downwind as the surface erodes. These points usually lie along ridges parallel to the prevailing wind; they are steep on the windward side and sloping to the leeward side. Smaller irregularities of this type are known as ripples (small, ~10 mm high) or wind ridges.

Large sastrugi are troublesome to skiers and snowboarders. Traveling on the irregular surface of sastrugi can be very tiring, and can risk breaking equipment—ripples and waves are often undercut and the surface is hard and unforgiving, with constant minor topographic changes between ridge and trough.