sastruga
Sastrugi, or zastrugi, are features formed by the 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.
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