| 释义 |
nivation Geol.|naɪˈveɪʃən|
[f. L. niv-, nix snow + -ation.]
Erosion of the ground beneath and at the sides of a snowbank, mainly as a result of alternate freezing and thawing.
1900F. E. Matthes in 21st Ann. Rep. U.S. Geol. Survey ii. 183 These névé effects..I shall, for the sake of brevity, speak of as effects of nivation. 1918Proc. Nat. Acad. Sci. IV. 288 (heading) The importance of nivation as an erosive factor, and of soil flow as a transporting agency, in northern Greenland. 1957G. E. Hutchinson Treat. Limnol. I. i. 59 A few cases may be found where nivation, or the freezing and thawing of water round patches of snow, has produced small closed depressions in jointed or fractured rocks. 1968R. W. Fairbridge Encycl. Geomorphol. 123/2 When a deep snowdrift fails to melt away during summer, periodic freezing and thawing of the constantly moistened ground around and beneath it leads to the breakup of the rock particles which are then removed by meltwaters. This process is known as nivation. |