| 释义 |
sastruga|sæˈstruːgə|
Also zastruga; chiefly as pl. sastrugi |-ɪ|.
[a. G. sastruga, f. dial. Russ. zastrúga small ridge, furrow, f. zastrugát́ to plane, smooth, f. strug plane.]
One of a series of irregular ridges formed on a snow surface by wind erosion and deposition, aligned parallel to the direction of the prevailing wind.
1840E. J. Sabine tr. von Wrangell's Narr. Exped. Polar Sea vii. 146 We were guided by the wave-like stripes of snow (sastrugi) which are formed, either on the plains on land or on the level ice of the sea, by any wind of long continuance. Ibid. 147 It often happens that the true permanent sastruga has been obliterated by another produced by temporary winds. 1878E. L. Moss Shores of Polar Sea vi. 42 The sloping shore hills are barred with ‘sastrugi’—wind-made ridges of snow—but the abrupt scooped-out rifts between them are smothered over with fleecy powder in gentle undulations. 1911R. F. Scott Jrnl. in Last Exped. (1913) I. 517 The hard surface gave place to regular sastrugi. 1937Geogr. Jrnl. LXXXIX. 195 He remarks on sastrugi 6 inches high, then for three days very few. 1960Times 17 Feb. 10/3 Much of the traverse was conducted over a difficult surface rippled with sastrugi. 1975E. Hillary Nothing venture, Nothing Win xiii. 243 The surface, which had appeared so smooth from above, was..liberally peppered with large sastrugi—some of them up to three feet in height. 1979R. Fiennes Hell on Ice v. 70 The sastruga ripples we encountered along the summit ridges. 1982B. W. Aldiss Helliconia Spring ii. 89 Only Yuli had experience of the tundras and zastrugi, which stretched away to the north of the Quzint. |