| 单词 | alluvial fan |
| 释义 | > as lemmasalluvial fan alluvial fan n. a deposit of alluvium, having the approximate shape of a segment of a circle, laid down by a river at a point where the gradient decreases, as at the base of a range of hills: cf. fan n.1 5e. ΘΚΠ the world > the earth > structure of the earth > structural features > deposited by water, ice, or wind > [noun] > by water roddon1857 platform-mud1863 cone1864 fan1864 levee1870 alluvial fan1873 apron1889 sand-wash1901 scroll1902 spillbank1909 sheet-flow1928 point bar1945 1862 London, Edinb., & Dublin Philos. Mag. 4th Ser. 24 379 Ancient alluvial fan-shaped masses of gravel quite analogous to those that by the agency of existing torrents have issued from the gorges.] 1873 Q. Jrnl. Geol. Soc. 29 446 At the mouth of each of these [gorges] are alluvial fans, which project out into the flat of the river-alluvium. 1911 National Geographic Mag. Dec. 1095/1 One immense flattened alluvial fan, spread from the debouchure of the Min over all the lower tract between the Szechuan Alps on the west and the buttes..to the east. 1962 M. E. Murie Two in Far North iv. vii. 416 One of these..alluvial fans..was so wide it took us forty-five minutes to walk across it. 2006 SageWoman Spring 13/1 Complex geologic formations such as deep canyons, high-standing cliffs, steep bajadas, and alluvial fans. < as lemmas |
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