| 单词 | sand wave |
| 释义 | > as lemmassand wave sand wave n. a wave-like formation in sand; spec. in Physical Geography, an undulation similar to a megaripple but on a larger scale. ΘΚΠ the world > the earth > land > landscape > high land > rising ground or eminence > [noun] > undulation > sand-wave sand wave1820 sand ripple1879 megaripple1953 1820 J. Keats Ode on Melancholy in Lamia & Other Poems 141 Then glut thy sorrow on..the rainbow of the salt sand-wave. 1899 Geogr. Jrnl. 13 624 The sand-waves which corrugate the beds of streams and rivers. 1902 ‘M. Twain’ in Harper's Mag. Jan. 269/2 He started on a run, racing in and out among the sage-bushes a matter of three hundred yards, and disappeared over a sand-wave. 1917 Bull. Geol. Soc. Amer. 28 915 Cross~bedding..probably represents in many instances one phase of a phenomenon called sand waves, which are nothing more than current-made ripple-mark[s] of mammoth proportions... The crests are often 15 to 35 feet apart and rise from 2 to 3 feet above the troughs. 1939 W. H. Twenhofel Princ. Sedimentation vi. 190 The sand waves or antidunes move up-current as the individual sands move down-current. 1978 Nature 14 Sept. 101/2 Sandwaves are the largest scale of bedform.., with average heights and wavelengths markedly larger than those of megaripples. < as lemmas |
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